bluuebunny/crossref_metadata_2025 huggingface dataset:
Platform-Motion Correction of Velocity Measured by Doppler Lidar
Authors: Hill Reginald J. , Brewer W. Alan , Tucker Sara C.
Published: February 2008

The NOAA/Earth System Research Laboratory (ESRL) has two coherent Doppler lidar systems that have been deployed on board research vessels to obtain data during several experiments. The instruments measure the wind velocity relative to the motion of the lidar; therefore, correction for the motion of the platform is required. This article gives a thorough analysis of the correction for lidar velocity measurements. The analysis is general enough to be applied to Doppler velocity measurements from all monostatic ship- and aircraftborne lidars and radars, and generalization to bistatic systems is achievable. The correction is demonstrated using miniature master-oscillator power-amplifier (mini-MOPA) Doppler velocity data obtained during the Rain in Cumulus over the Ocean (RICO) experiment.
First-Year Operation of a New Water Vapor Raman Lidar at the JPL Table Mountain Facility, California
Authors: Leblanc Thierry , McDermid I. Stuart , Aspey Robin A.
Published: February 2008

A new water vapor Raman lidar was recently built at the Table Mountain Facility (TMF) of the Jet Propulsion Laboratory (JPL) in California and more than a year of routine 2-h-long nighttime measurements 4–5 times per week have been completed. The lidar was designed to reach accuracies better than 5% anywhere up to 12-km altitude, and with the capability to measure water vapor mixing ratios as low as 1 to 10 ppmv near the tropopause and in the lower stratosphere. The current system is not yet fully optimized but has already shown promising results as water vapor profiles have been retrieved up to 18-km altitude. Comparisons with Vaisala RS92K radiosondes exhibit very good agreement up to at least 10 km. They also revealed a wet bias in the lidar profiles (or a dry bias in the radiosonde profiles), increasing with altitude and becoming significant near 10 km and large when approaching the tropopause. This bias cannot be explained solely by well-known too-dry measurements of the RS92K in the upper troposphere and therefore must partly originate in the lidar measurements. Excess signal due to residual fluorescence in the lidar receiver components is among the most likely candidates and is subject to ongoing investigation.
High-Resolution Radio Acoustic Sounding System Observations and Analysis up to 20 km
Authors: Alexander Simon P. , Tsuda Toshitaka
Published: February 2008

The first campaign-based measurements of virtual temperature in the upper-troposphere and lower-stratosphere (UTLS) region were made with the middle- and upper-atmosphere (MU) radar radio acoustic sounding system (RASS) during 4 days in August 1995. This dataset was examined in order to study high-frequency changes in the stability below 20 km, but especially in the UTLS region. Calculations of the WMO tropopause and cold-point tropopause heights showed the latter to be (1.0 ± 0.6) km higher, where 0.6 km is the standard deviation. A diurnal cycle of temperature and wind dominated the spectra, which was identified as the diurnal solar tide. Its phase maximum occurred in the afternoon between 5 and 15 km and showed upward energy propagation above this height. Changes in the UTLS kinetic energy dissipation rate ε showed significant high-frequency fluctuations embedded within layers that persisted for at least 1 day. Relative to the WMO tropopause height, the median ε increased from (0.5 ± 0.1) × 10−3 m2 s−3 in the upper troposphere to (0.7 ± 0.1) × 10−3 m2 s−3 in the lower stratosphere.
A Four-Year Lidar–Sun Photometer Aerosol Study at São Paulo, Brazil
Authors: Landulfo Eduardo , Papayannis Alexandros , Torres Ani Sobral , Uehara Sandro Toshio , Pozzetti Lucila Maria Viola , Alencar de Matos Caio , Sawamura Patricia , Morinobu Nakaema Walter , de Jesus Wellington
Published: February 2008

A backscattering lidar system, the first of this kind in Brazil, has been used to provide the vertical profile of the aerosol backscatter coefficient at 532 nm up to an altitude of 4–6 km above sea level (ASL), in a suburban area in the city of São Paulo. The lidar system has been operational since September 2001. The lidar data products were obtained in a 4-yr period (2001–04) and concerned the aerosol optical thickness (AOT), the aerosol backscattering and extinction coefficients at 532 nm, cloud properties (cloud base, thickness), planetary boundary layer (PBL) heights, aerosol layering, and the structure and dynamics of the lower troposphere. The lidar data are presented and analyzed in synergy with AOT measurements obtained by a Cimel sun-tracking photometer in the visible spectral region, not only to validate the lidar data but also to provide an input value of the so-called extinction-to-backscatter ratio [lidar ratio (LR)]. A correlation between the lidar data and the data obtained by a Cimel sun-tracking photometer [belonging to the Aerosol Robotic Network (AERONET)] is being made to set a temporal database of those data that were collected concomitantly and to cross correlate the information gathered by each instrument. The sun photometer data are used to provide AOT values at selected wavelengths and thus to derive the Ångström exponent (AE) values, single scattering albedo (SSA) and phase function values, and LR values. The analysis of these data showed an important trend in the seasonal signature of the LR indicating a change of the predominant type of aerosol between the dry and wet seasons. Thus, during the wet season the LR lidar values are greater (50–60 sr), which indicates that larger absorption by the aerosols takes place during this period. The corresponding AE values range between 1.3 and 2 for both periods.
Mobile Lidar Profiling of Tropical Aerosols and Clouds
Authors: Devara P. C. S. , Raj P. E. , Dani K. K. , Pandithurai G. , Kalapureddy M. C. R. , Sonbawne S. M. , Rao Y. J. , Saha S. K.
Published: February 2008

Lidar profiling of atmospheric aerosols and clouds in the lower atmosphere has been in progress at the Indian Institute of Tropical Meteorology (IITM), Pune (18°32′N, 73°52′E, 559 m MSL), India, for more than two decades. To enlarge the scope of these studies, an eye-safe new portable dual polarization micropulse lidar (DPMPL) has been developed and installed at this station. The system utilizes a diode-pumped solid-state (DPSS) neodymium–yttrium–aluminum–garnet (Nd:YAG) laser second harmonic, with either parallel polarization or alternate parallel and perpendicular polarization, as a transmitter and a Schmidt–Cassegrain telescope, with a high-speed detection and data acquisition and processing system, as a receiver. This online system in real-time mode provides backscatter intensity profiles up to about 75 km at every minute in both parallel and perpendicular polarization channels, corresponding to each state of polarization of the transmitted laser radiation. Thus, this versatile lidar system is expected to play a vital role not only in atmospheric aerosol and cloud physics research and environmental monitoring but also in weather and climate modeling studies of the impact of radiative forcing on the earth–atmosphere radiation balance and hydrological cycle. This paper provides a detailed description of Asia’s only lidar facility and presents initial observations of space–time variations of boundary layer structure from experiments carried out during winter 2005/06.
Deriving Atmospheric Temperature of the Tropopause Region–Upper Troposphere by Combining Information from GPS Radio Occultation Refractivity and High-Spectral-Resolution Infrared Radiance Measurements
Authors: Borbas Eva E. , Menzel W. Paul , Weisz Elisabeth , Devenyi Dezso
Published: February 2008

Global positioning system radio occultation (GPS/RO) measurements from the Challenging Minisatellite Payload (CHAMP) and Satelite de Aplicaciones Cientificas-C (SAC-C) satellites are used to improve tropospheric profile retrievals derived from the Aqua platform high-spectral-resolution Atmospheric Infrared Sounder (AIRS) and broadband Advanced Microwave Sounding Unit (AMSU) measurements under clear-sky conditions. This paper compares temperature retrievals from combined AIRS, AMSU, and CHAMP/SAC-C measurements using different techniques: 1) a principal component statistical regression using coefficients established between real (and in a few cases calculated) measurements and radiosonde atmospheric profiles; and 2) a Bayesian estimation method applied to AIRS plus AMSU temperature retrievals and GPS/RO temperature profiles. The Bayesian estimation method was also applied to GPS/RO data and the AIRS Science Team operational level-2 (version 4.0) temperature products for comparison. In this study, including GPS/RO data in the tropopause region produces the largest improvement in AIRS–AMSU temperature retrievals—about 0.5 K between 100 and 300 hPa. GPS/RO data are found to provide valuable upper-tropospheric information that improves the profile retrievals from AIRS and AMSU.
Application of an Adaptive Nudging Scheme in Air Quality Forecasting in China
Authors: Xu Xiangde , Xie Lian , Cheng Xinghong , Xu Jianming , Zhou Xiuji , Ding Guoan
Published: February 2008

A major challenge for air quality forecasters is to reduce the uncertainty of air pollution emission inventory. Error in the emission data is a primary source of error in air quality forecasts, much like the effect of error in the initial conditions on the accuracy of weather forecasting. Data assimilation has been widely used to improve weather forecasting by correcting the initial conditions with weather observations. In a similar way, observed concentrations of air pollutants can be used to correct the errors in the emission data. In this study, a new method is developed for estimating air pollution emissions based on a Newtonian relaxation and nudging technique. Case studies for the period of 1–25 August 2006 in 47 cities in China indicate that the nudging technique resulted in improved estimations of sulfur dioxide (SO2) and nitrogen dioxide (NO2) emissions in the majority of these cities. Predictions of SO2 and NO2 concentrations in January, April, August, and October using the emission estimations derived from the nudging technique showed remarkable improvements over those based on the original emission data.
The Storm-Track Response to Idealized SST Perturbations in an Aquaplanet GCM
Authors: Brayshaw David James , Hoskins Brian , Blackburn Michael
Published: February 2008

The tropospheric response to midlatitude SST anomalies has been investigated through a series of aquaplanet simulations using a high-resolution version of the Hadley Centre atmosphere model (HadAM3) under perpetual equinox conditions.

Model integrations show that increases in the midlatitude SST gradient generally lead to stronger storm tracks that are shifted slightly poleward, consistent with changes in the lower-tropospheric baroclinicity. The large-scale atmospheric response is, however, highly sensitive to the position of the SST gradient anomaly relative to that of the subtropical jet in the unperturbed atmosphere. In particular, when SST gradients are increased very close to the subtropical jet, then the Hadley cell and subtropical jet is strengthened while the storm track and eddy-driven jet are shifted equatorward. Conversely, if the subtropical SST gradients are reduced and the midlatitude gradients increased, then the storm track shows a strong poleward shift and a well-separated eddy-driven jet is produced. The sign of the SST anomaly is shown to play a secondary role in determining the overall tropospheric response.

These findings are used to provide a new and consistent interpretation of some previous GCM studies concerning the atmospheric response to midlatitude SST anomalies.
Low-Frequency Variability and Remote Forcing of Gap Winds over the East Pacific Warm Pool
Authors: Karnauskas Kristopher B. , Busalacchi Antonio J. , Murtugudde Raghu
Published: February 2008

The low-frequency variability of gap winds at the Isthmuses of Tehuantepec and Papagayo is investigated using a 17-yr wind stress dataset merging the remotely sensed observations of Special Sensor Microwave Imager (SSM/I) and Quick Scatterometer (QuikSCAT) satellite sensors. A decadal signal is identified in the Tehuantepec gap winds, which is shown to be related to the Atlantic tripole pattern (ATP). Using linear regression and spectral analysis, it is demonstrated that the low-frequency variability of the Tehuantepec gap winds is remotely forced by the ATP, and the Papagayo gap winds are primarily governed by El Niño–Southern Oscillation (ENSO) with the ATP being of secondary importance.

The Tehuantepec (Papagayo) time series of wind stress anomalies can be better reconstructed when the local cross-isthmus pressure difference and large-scale climate information such as the ATP (ENSO) are included, suggesting that there is important information in the large-scale flow that is not transmitted directly through the background sea level pressure gradient. The geostrophic modulation of the easterly trades in the western Caribbean also serve as a remote driver of the Papagayo gap winds, which is itself not fully independent from ENSO. Finally, it is suggested that precipitation variability in the Inter-Americas region is closely related to the same remote forcing as that of the Tehuantepec gap winds, being the ATP and associated large-scale atmospheric circulation.
Stationarity of Regression Relationships: Application to Empirical Downscaling
Authors: Schmith Torben
Published: February 2008

The performance of a statistical downscaling model is usually evaluated for its ability to explain a large fraction of predictand variance. In this note, it is shown that although this fraction may be high, the longest time scales, including trends, may not be explained by the model. This implies that the model is nonstationary over the training period of the model, and it questions the basic stationarity assumption of statistical downscaling. This is exemplified by using a simple regression model for downscaling European precipitation and surface temperature where appropriate Monte Carlo–based field significance tests are developed, taking into account the intercorrelation between predictand series. Based on this test, it is concluded that care is needed in selecting predictors to avoid this form of nonstationarity. Even though this is illustrated for a simple regression-type statistical downscaling model, the main conclusions may also be valid for more complicated models.
Interannual to Diurnal Variations in Tropical and Subtropical Deep Convective Clouds and Convective Overshooting from Seven Years of AMSU-B Measurements
Authors: Hong Gang , Heygster Georg , Notholt Justus , Buehler Stefan A.
Published: February 2008

This study surveys interannual to diurnal variations of tropical deep convective clouds and convective overshooting using the Advanced Microwave Sounding Unit B (AMSU-B) aboard the NOAA polar orbiting satellites from 1999 to 2005. The methodology used to detect tropical deep convective clouds is based on the advantage of microwave radiances to penetrate clouds. The major concentrations of tropical deep convective clouds are found over the intertropical convergence zone (ITCZ), the South Pacific convergence zone (SPCZ), tropical Africa, the Indian Ocean, the Indonesia maritime region, and tropical and South America. The geographical distributions are consistent with previous results from infrared-based measurements, but the cloud fractions present in this study are lower. Land–ocean and Northern–Southern Hemisphere (NH–SH) contrasts are found for tropical deep convective clouds. The mean tropical deep convective clouds have a slightly decreasing trend with −0.016% decade−1 in 1999−2005 while the mean convective overshooting has a distinct decreasing trend with −0.142% decade−1. The trends vary with the underlying surface (ocean or land) and with latitude. A secondary ITCZ occurring over the eastern Pacific between 2° and 8°S and only in boreal spring is predominantly found to be associated with cold sea surface temperatures in La Niña years. The seasonal cycles of deep convective cloud and convective overshooting are stronger over land than over ocean. The seasonal migration is pronounced and moves south with the sun from summer to winter and is particularly dramatic over land. The diurnal cycles of deep convective clouds and convective overshooting peak in the early evening and have their minima in the late morning over the tropical land. Over the tropical ocean the diurnal cycles peak in the morning and have their minima in the afternoon to early evening. The diurnal cycles over the NH and SH subtropical regions vary with the seasons. The local times of the maximum and minimum fractions also vary with the seasons. As the detected deep convective cloud fractions are sensitive to the algorithms and satellite sensors used and are influenced by the life cycles of deep convective clouds, the results presented in this study provide information complementary to present tropical deep convective cloud climatologies.
Erroneous Relationships among Humidity and Cloud Forcing Variables in Three Global Climate Models
Authors: Bennhold Florian , Sherwood Steven
Published: February 2008

Links are examined between time-averaged cloud radiative properties, particularly the longwave and shortwave components of cloud radiative forcing (CRF), and properties of the long-term averages of atmospheric soundings, in particular upper-tropospheric humidity (UTH), lower-tropospheric precipitable water (PW), and static stability (SS). The joint distributions of moisture measures and the composite or conditional mean CRF for different moisture and stability combinations are computed. This expands on previous studies that have examined cloud properties versus vertical velocity and surface temperature. These computations are done for satellite observations and for three representative coupled climate models from major modeling centers.

Aside from mean biases reported previously, several departures are identified between the modeled and observed joint distributions that are qualitative and significant. Namely, the joint distribution of PW and UTH is very compact in observations but less so in models, cloud forcings are tightly related to PW in the data but to UTH in the models, and strong negative net CRF in marine stratocumulus regions occurs only for high SS and low UTH in the data but violates one or both of these restrictions in each of the models.

All three errors are preliminarily interpreted as symptoms of inadequate dependence of model convective development on ambient humidity above the boundary layer. In any case, the character of the errors suggests utility for model testing and future development. A set of scalar metrics for quantifying some of the problems is presented; these metrics can be easily applied to standard model output.

Finally, an examination of doubled-CO2 simulations suggests that the errors noted here are significantly affecting cloud feedback in at least some models. For example, in one model a strong negative feedback is found from clouds forming in model conditions that never occur in the observations.
Cloud Effects on the Meridional Atmospheric Energy Budget Estimated from Clouds and the Earth’s Radiant Energy System (CERES) Data
Authors: Kato Seiji , Rose Fred G. , Rutan David A. , Charlock Thomas P.
Published: February 2008

The zonal mean atmospheric cloud radiative effect, defined as the difference between the top-of-the-atmosphere (TOA) and surface cloud radiative effects, is estimated from 3 yr of Clouds and the Earth’s Radiant Energy System (CERES) data. The zonal mean shortwave effect is small, though it tends to be positive (warming). This indicates that clouds increase shortwave absorption in the atmosphere, especially in midlatitudes. The zonal mean atmospheric cloud radiative effect is, however, dominated by the longwave effect. The zonal mean longwave effect is positive in the tropics and decreases with latitude to negative values (cooling) in polar regions. The meridional gradient of the cloud effect between midlatitude and polar regions exists even when uncertainties in the cloud effect on the surface enthalpy flux and in the modeled irradiances are taken into account. This indicates that clouds increase the rate of generation of the mean zonal available potential energy. Because the atmospheric cooling effect in polar regions is predominately caused by low-level clouds, which tend to be stationary, it is postulated here that the meridional and vertical gradients of the cloud effect increase the rate of meridional energy transport by the dynamics of the atmosphere from the midlatitudes to the polar region, especially in fall and winter. Clouds then warm the surface in the polar regions except in the Arctic in summer. Clouds, therefore, contribute toward increasing the rate of meridional energy transport from the midlatitudes to the polar regions through the atmosphere.
Robustness of Future Changes in Local Precipitation Extremes
Authors: Kendon Elizabeth J. , Rowell David P. , Jones Richard G. , Buonomo Erasmo
Published: February 2008

Reliable projections of future changes in local precipitation extremes are essential for informing policy decisions regarding mitigation and adaptation to climate change. In this paper, the extent to which the natural variability of the climate affects one’s ability to project the anthropogenically forced component of change in daily precipitation extremes across Europe is examined. A three-member ensemble of the Hadley Centre Regional Climate Model (HadRM3H) is used and a statistical framework is applied to estimate the uncertainty due to the full spectrum of climate variability. In particular, the results and understanding presented here suggest that annual to multidecadal natural variability may contribute significant uncertainty. For this ensemble projection, extreme precipitation changes at the grid-box level are found to be discernible above climate noise over much of northern and central Europe in winter, and parts of northern and southern Europe in summer. The ability to quantify the change to a reasonable level of accuracy is largely limited to regions in northern Europe. In general, where climate noise has a significant component varying on decadal time scales, single 30-yr climate change projections are insufficient to infer changes in the extreme tail of the underlying precipitation distribution. In this context, the need for ensembles of integrations is demonstrated and the relative effectiveness of spatial pooling and averaging for generating robust signals of extreme precipitation change is also explored. The key conclusions are expected to apply more generally to other models and forcing scenarios.
Equilibrium Response of an Atmosphere–Mixed Layer Ocean Model to Different Radiative Forcing Agents: Global and Zonal Mean Response
Authors: Yoshimori Masakazu , Broccoli Anthony J.
Published: February 2008

The equilibrium response to various forcing agents, including CO2, solar irradiance, tropospheric ozone, black carbon, organic carbon, sulfate, and volcanic aerosols, is investigated using an atmospheric general circulation model coupled to a mixed layer ocean model. The experiments are carried out by altering each forcing agent separately. Realistic spatial patterns of forcing constituents are applied but the magnitude of the forcing is adjusted so that each forcing constituent yields approximately the same strength of radiative forcing. It is demonstrated that the global mean temperature response depends on the types of forcing agents and the efficacy with respect to CO2 forcing ranges from 58% to 100%. The smallest efficacy is seen in one of the black carbon experiments and is associated with negative cloud feedback. The sign of the cloud feedback is shown to be sensitive to the vertical distribution of black carbon. The feedback analysis suggests that the small efficacy in tropospheric ozone is due to a large negative lapse rate feedback. Global mean precipitation increases when the earth warms except for the case of black carbon in which precipitation decreases. In all experiments, the global mean convective mass flux decreases when the earth’s surface warms. When the applied radiative forcing resulting from a particular forcing agent is stronger in one hemisphere, anomalous heat exchange between the hemispheres results in conjunction with changes in the Hadley circulation. The magnitude of interhemispheric heat transport is little sensitive to the details of the forcing, but is determined primarily by the interhemispheric contrast in forcing. The change in the Hadley circulation strongly impacts the precipitation changes in low latitudes.
Boreal Summer Intraseasonal Variability in Coupled Seasonal Hindcasts
Authors: Xavier Prince K. , Duvel Jean-Philippe , Doblas-Reyes Francisco J.
Published: February 2008

The intraseasonal variability (ISV) of the Asian summer monsoon represented in seven coupled general circulation models (CGCMs) as part of the Development of a European Multimodel Ensemble System for Seasonal-to-Interannual Prediction (DEMETER) project is analyzed and evaluated against observations. The focus is on the spatial and seasonal variations of ISV of outgoing longwave radiation (OLR). The large-scale organization of convection, the propagation characteristics, and the air–sea coupling related to the monsoon ISV are also evaluated. A multivariate local mode analysis (LMA) reveals that most models produce less organized convection and ISV events of shorter duration than observed. Compared to the real atmosphere, these simulated patterns of perturbations are poorly reproducible from one event to the other. Most models simulate too weak sea surface temperature (SST) perturbations and systematic phase quadrature between OLR, surface winds, and SST—indicative of a slab-ocean-like response of the SST to surface flux perturbations. The relatively coarse vertical resolution of the different ocean GCMs (OGCMs) limits their ability to represent intraseasonal processes, such as diurnal warm layer formation, which are important for realistic simulation of the SST perturbations at intraseasonal time scales. Models with the same atmospheric GCM (AGCM) and different OGCMs tend to have similar biases of the simulated ISV, indicating the dominant role of atmospheric models in fixing the nature of the intraseasonal variability. It is, therefore, implied that improvements in the representation of ISV in coupled models have to fundamentally arise from fixing problems in the large-scale organization of convection in AGCMs.
Pacific Subtropical Cell Response to Reduced Equatorial Dissipation
Authors: Harrison M. J. , Hallberg R. W.
Published: February 2008

Equatorial turbulent diffusivities resulting from breaking gravity waves may be more than a factor of 10 less than those in the midlatitudes. A coupled general circulation model with a layered isopycnal coordinate ocean is used to assess Pacific climate sensitivity to a latitudinally varying background diapycnal diffusivity with extremely low values near the equator.

The control experiments have a minimum upper-ocean diffusivity of 10−5 m2 s−1 and are initialized from present-day conditions. The average depth of the σθ = 26.4 interface (z26.4) in the Pacific increases by ∼140 m after 500 yr of coupled model integration. This corresponds to a warming trend in the upper ocean. Low equatorial diffusivities reduce the z26.4 bias by ∼30%. Isopycnal surfaces are elevated from the eastern boundary up to midlatitudes by cooling in the upper several hundred meters, partially compensated by freshening. Entrainment of intermediate water masses from below σθ = 26.4 decreases by ∼1.5 Sv (1 Sv ≡ 106 m3 s−1), mainly in the western tropical Pacific. The Pacific heat uptake (30°S–30°N) from the atmosphere reduces by ∼0.1 PW. This is associated with warmer entrainment temperatures in the eastern equatorial Pacific upwelling region. Equatorward heat transport from the Southern Ocean increases by ∼0.07 PW.

Reducing the upper-ocean background diffusivity uniformly to 10−6 m2 s−1 cools the upper ocean from the tropics, but warms and freshens from the midlatitudes. Enhanced convergence into the Pacific of water lighter than σθ = 26.4 compensates the reduction in upwelling of intermediate waters in the tropics. Basin-averaged z26.4 bias increases in the low background case.

These results demonstrate basin-scale sensitivity to the observed suppression of equatorial background dissipation. This has clear implications for understanding oceanic heat uptake in the Pacific as well as other important aspects of the climate system. Diapycnal diffusivities due to truncation errors and other numerical artifacts in ocean models may need to be less than 10−6 m2 s−1 in order to accurately represent this effect in climate models.
A 20-Yr Average of the Indonesian Throughflow: Regional Currents and the Interbasin Exchange
Authors: Wijffels Susan E. , Meyers Gary , Godfrey J. Stuart
Published: February 2008

Twenty years of monthly or more frequent repeat expendable bathythermograph data are used to estimate the mean geostrophic velocity and transport relative to 750 m of the Indonesian Throughflow (ITF) and its partitioning through the major outflow straits into the Indian Ocean. Ekman transports are estimated from satellite and atmospheric reanalysis wind climatologies. A subsurface maximum near 100 m characterizes the geostrophic ITF, but Ekman flows drive a warm near-surface component as well. A subsurface intensified fresh Makassar Jet feeds the Lombok Strait Throughflow (∼2 Sv; 1Sv ≡ 106 m3 s−1) and an eastward flow along the Nusa Tenggara island chain [the Nusa Tenggara Current (6 Sv)]. This flow feeds a relatively cold 3.0-Sv flow through the Ombai Strait and Savu Sea. About 4–5 Sv pass through Timor Passage, fed by both the Nusa Tenggara Current and likely warmer and saltier flow from the eastern Banda Sea. The Ombai and Timor Throughflow feature distinctly different shear profiles; Ombai has deep-reaching shear with a subsurface velocity maximum near 150 m and so is cold (∼15.5°–17.1°C), while Timor Passage has a surface intensified flow and is warm (∼21.6°–23°C). At the western end of Timor Passage the nascent South Equatorial Current is augmented by recirculation from a strong eastward shallow flow south of the passage. South of the western tip of Java are two mean eastward flows—the very shallow, warm, and fresh South Java Current and a cold salty South Java Undercurrent. These, along with the inflow of the Eastern Gyral Current, recirculate to augment the South Equatorial Current, and greatly increase its salinity compared to that at the outflow passages. The best estimate of the 20-yr-average geostrophic plus Ekman transport is 8.9 ± 1.7 Sv with a transport-weighted temperature of 21.2°C and transport-weighted salinity of 34.73 near 110°E. The warm temperatures of the flow can be reconciled with the much cooler estimates based on mooring data in Makassar Strait by accounting for an unmeasured barotropic and deep component, and local surface heat fluxes that warm the ITF by 2°–4°C during its passage through the region.
Sources of Validity Evidence for Educational and Psychological Tests
Authors: Cizek Gregory J. , Rosenberg Sharyn L. , Koons Heather H.
Published: February 2008

This study investigates aspects of validity reflected in a large and diverse sample of published measures used in educational and psychological testing contexts. The current edition of Mental Measurements Yearbook served as the data source for this study. The validity aspects investigated included perspective on validity represented, number and kinds of sources of validity evidence provided, overall evaluation of the favorability of the test, and whether these factors varied as a function of the type of test. Findings reveal that validity information is not routinely provided in terms of modern validity theory, some sources of validity evidence (e.g., consequential) are essentially ignored in validity reports, and the favorability of judgments about a test is more strongly related to the number of validity sources provided than to the perspective on validity taken or other factors. The article concludes with implications for extending and refining current validity theory and validation practice.
A Bottom-Up Perspective on Innovations
Authors: Andersen Ole Johan
Published: February 2008

The article focuses on a kind of innovation trajectory, based on the reemployment of assets that belong to the legacy of the past. Thus, it argues for the importance of utilizing know-how and social capital accumulated over the years in organizations' efforts to launch a new course. The concept of bricolage appears especially clarifying in throwing light on innovations emerging through bottom-up processes, utilizing what is at hand or embedded locally. However important breakthrough and pioneering entrepreneurs might be, what really matters in the long run is more incremental processes of problem solving. In elaborating this view on innovation, the article addresses organizational devolution and partnership. According to the article, top-down steering or strategic determination do not suffice to account for the processes underlying the application of these tools. Innovative processes of bricolage based on a bottom-up mobilization appear pivotal for releasing creativity.
On Value Differences Experienced by Sector Switchers
Authors: de Graaf Gjalt , van der Wal Zeger
Published: February 2008

This article examines experienced differences in values between employees in the public and private sector. To elucidate them, the authors interviewed 30 employees of the public sector previously employed in the private sector and 30 employees of the private sector previously employed in the public sector, all of them in the Netherlands. The major conclusion is that the values of profitability, competitiveness, and customer orientation have a greater influence on business decisions; in public organizations, values such as legitimacy, lawfulness, accountability, and impartiality play a larger role. However, great differences exist among the organizations within each sector.
Religiousness and Longitudinal Trajectories in Elders' Functional Status
Authors: Nan Sook Park  , Klemmack David L. , Roff Lucinda L. , Parker Michael W. , Koenig Harold G. , Sawyer Patricia , Allman Richard M.
Published: February 2008

The purpose of this study was to examine the effects of religiousness on the trajectories of difficulties with activities of daily living (ADLs) and instrumental ADLs (IADLs) in community-dwelling older adults over a three-year period. Seven waves of data from the University of Alabama at Birmingham Study of Aging were analyzed using a hierarchical linear modeling method. The study was based on the 784 participants who completed interviews every six months between December 1999 and February 2004. Frequent religious service attendance was associated with fewer ADL difficulties and IADL difficulties at baseline. Furthermore, religious service attendance predicted slower increases for frequent churchgoers and steeper increases for less frequent churchgoers in IADL difficulties, controlling for variables related to demographics and resources. Religious service attendance was independently associated with ADL and IADL difficulties cross-sectionally. However, significant protective effects of religious service attendance were identified longitudinally only for the IADL trajectory.
Second Language Orientation and Self-Determination Theory
Authors: Pae Tae-Il
Published: February 2008

The purpose of the present study is two-fold. First, the present study examines statistical similarity between the integrative and instrumental orientation and Self-Determination Theory subtypes of motivation using chi-square invariance test. Second, based on the results of the chi-square invariance test, the present study further investigates the structural relationships among factors affecting second language achievement. Results of the chi-square invariance test evidence a statistical similarity between the instrumental orientation and external regulation, whereas similarity between the integrative orientation and intrinsic motivation did not reach the point of statistical significance. Results of the structural analyses demonstrate that intrinsic motivation was the strongest determinant of learners' self-confidence and motivation to learn a second language. It is also found that intrinsic motivation was only indirectly related to second language achievement through the mediating effects of motivation and self-confidence. Pedagogical implications are discussed.
Young Adults' Intergenerational Communication Schemas in Taiwan and the USA
Authors: Lin Mei-Chen , Harwood Jake , Lee Hummert Mary
Published: February 2008

The present research systematically examines cognitive representations of stereotypes of old age and young adults' and older adults' perceptions of their own communication accommodative behaviors, emotions, and communication satisfaction when a particular Intergenerational Communication Schema is activated. Taiwanese respondents show both congruent and incongruent patterns of responding: Some schemas yield consistently positive or negative responses across dependent variables, whereas others yield mixed and apparently inconsistent patterns. Respondents from the USA show that a helping orientation, when it is associated with different schemas (positive, very sympathetic, or negative) may result in different overall evaluations of the intergenerational conversation experience. Results are discussed in relation to the Communication Predicament of Aging Model and Chinese cultural values of intergenerational communication. Limitations are acknowledged and future studies are suggested.
Regional Variation in the Use of Sarcasm
Authors: Dress Megan L. , Kreuz Roger J. , Link Kristen E. , Caucci Gina M.
Published: February 2008

College students in New York and Tennessee participated in tasks designed to measure their use of sarcasm. They also provided definitions for the terms irony and sarcasm and completed part of a Sarcasm Self-Report Scale. Northern participants generated more sarcastic completions and chose more direct ironic statements than their Southern counterparts did. Regional differences accounted for a unique amount of variance when other demographic factors were controlled for. Northern and male participants self-reported using sarcasm more than Southern and female participants, respectively. Northern participants defined sarcasm as involving more humor than Southern participants. Correlations of the participants' use of sarcasm and the self-report measure revealed a moderate degree of metapragmatic awareness. This study is the first to demonstrate regional differences in the use of sarcasm, and possible reasons for these differences are discussed.
Bread Subsidies in Egypt: Choosing Social Stability or Fiscal Responsibility
Authors: Salevurakis John William , Sahar Mohamed Abdel-Haleim
Published: February 2008

Bread subsidies contribute greatly to social stability in Egypt, yet there exist academic and political tendencies to abandon the system in the interest of market-based efficiency. This represents a shift in contemporary economic ideology historically focused upon maintaining calm after Cairo's 1977 bread riots. Further, international pressure to `liberalize` the Egyptian economy paradoxically conflicts with Western desires to suppress religious fundamentalism in the region. These incongruities are largely ignored by Egyptian and Western research.
Can Bioethics Be Global and Local, or Must It Be Both?
Authors: Finkler Kaja
Published: February 2008

This article contributes to ethnography of bioethical practices in a developing nation by examining how doctors perceive and use them in Mexico. We ask whether principle-based bioethics can transplant to a developing nation. An analysis reveals the bioethical approaches in different hospital settings, the local nature of bioethical understanding, and a universal requirement for ethical distribution of health care. After an overview of U.S. bioethics development and of Mexican biomedical institutions, the article presents field research done on bioethical conceptualizations and practices in two Mexican government hospitals. An analysis of the bioethical dilemmas physicians face and the approaches taken within the society in different institutional venues uncovers the local character of bioethics and the universal bioethical needs, and the intersection between micro and macro processes in hospital health care. While local conditions must guide a physician's day-to-day ethical practices, a global bioethics is needed to address universal problems experienced in economically developing nations.
Outside the Ward and Clinic
Authors: McCoy Brian F.
Published: February 2008

Despite predictions in the 1970s that, with the advent of Western medicine, there would be no Aboriginal healers by the end of the twentieth century, maparn continue to be active within the Kutjungka region of the Kimberley (Western Australia). Using narrative and art from the healers themselves, the author examines their contemporary role and practice. As desert people continue to engage their healers, as also the services of the local health clinic, the author explores how two very different models of health care might better understand each other and work together to improve desert people's health.
Negotiating Boundaries and Roles
Authors: Tinney Jean
Published: February 2008

There is ambiguity in the role of the institution that tries to be a “home” and a place of physical care and protection. Many nursing home residents are constrained by physical and social isolation, their vulnerability increased by unmet social needs. Equally, there is ambiguity in the role of the volunteer ethnographer. The obligation to do no harm is rendered more salient by resident dependence and the intensity of nursing home relationships. Ambiguities are entailed in combining the roles of researcher and volunteer in attempting to maintain observer objectivity while becoming a trusted intimate of both the residents who live in the institution and the staff who work there. How does a volunteer determine how to “ration” help when the need for it is constant? The ethnographer is challenged to limit participation and to preserve enough distance to meet the responsibilities entailed in ethical and rigorous research.
Constructing Hope
Authors: Warren Narelle , Manderson Lenore
Published: February 2008

Hope and recovery are focal narratives within rehabilitation discourse, which is characterized by its goal of returning physical functioning to individuals in a way reminiscent of their pre-impairment ways of life. Rehabilitation is concerned with coming to terms with often devastating bodily disruption and learning strategies to minimize it. Rehabilitation provides individuals with skills and tools designed to enable them to return to their former life. This discourse of “return to normal” is problematic for elderly or seriously ill patients, whose bodily disruption often occurs toward the end of a phase characterized by an extended period of ill-health and/or disease, and whose embodied experiences directly challenge the rehabilitative discourse. For these patients, the projected future is usually short-term and features decreasing levels of function and participation because of their health status. We explore the disjuncture between rehabilitative discourse constructed by and within the multidisciplinary clinical team and lived experiences for elderly people who have undergone amputation.
Native among the Natives
Authors: Zaman Shahaduz
Published: February 2008

The focus of the present article is the methodological aspects of conducting ethnography in a district level hospital in Bangladesh, the first of its kind in the country. Ethnographies in non-Western medical settings are rare. I describe the experience of gaining entry and negotiating my way through diverse gatekeepers, building rapport and trust with the doctors, the staff community, and the patients. I share the challenges of being native among the natives as my “nativity” was twofold: as a Bangladeshi doing fieldwork in the country, and as a medical doctor studying a hospital, the domain of doctors.
A Comparison of the Health of Older Hispanics in the United States and Mexico
Authors: Angel Ronald J. , Angel Jacqueline L. , Hill Terrence D.
Published: February 2008

Objectives: This study compares various dimensions of physical and emotional health between older Mexican-origin individuals in the United States and in Mexico. Method: The samples are drawn from the Mexican Health and Aging Study (MHAS) and the Hispanic Established Epidemiologic Study of the Elderly (H-EPESE) and include 3,875 Mexican residents with no history of residence in the United States and 2,734 Mexican-origin individuals 65 and older who live in the southwestern United States. Results: Both immigrant and native-born Mexican-origin elders in the United States report more chronic conditions than elderly Mexicans, but they report fewer symptoms of psychological distress. Longer residence in the United States is associated with higher body mass index scores. Discussion: The discussion addresses the possibility that access to care influences reports of diagnosed conditions and touches on issues of comparability in cross-cultural research and the difficulty in clearly distinguishing cultural and system-level factors in the production and measurement of health.
Knowledge and Perceptions in Advance Care Planning
Authors: Porensky Emily K. , Carpenter Brian D.
Published: February 2008

Objective: This study explores detailed knowledge of medical terminology and connotations of equivocal phrases frequently used in advance care planning. Method: One hundred seventy community-dwelling older adults answered yes-or-no questions about their knowledge of medical conditions and treatments and completed a written questionnaire about their connotations of ambiguous phrases such as “live like a vegetable.” Results: On average, participants answered 78% of all factual questions correctly; however, accuracy ranged from 59% to 94% across individuals. Participants knew the most about basic treatment purposes and procedures and the least about treatment outcomes. Perceptions of equivocal phrases were idiosyncratic, even for conventional terms such as improvement. Discussion: Older adults approach advance care planning with critical misconceptions and individualistic perceptions, about which family and health care professionals may be unaware. Efforts to improve advance care planning should include instruction concerning medical information and encouragement to use explicit language to express treatment preferences.
The Treatment Motivation Scales for Forensic Outpatient Treatment (TMS-F)
Authors: Drieschner Klaus H. , Boomsma Anne
Published: February 2008

The Treatment Motivation Scales for forensic outpatient treatment (TMS-F) is a Dutch 85-item self-report questionnaire for the motivation of forensic outpatients to engage in their treatment and six cognitive and affective determinants of this motivation. Following descriptions of the conceptual basis and construction, the psychometric properties of the TMS-F are evaluated in two studies. In Study 1 (N = 378), the factorial structure of the instrument and the dimensionality of its scales are evaluated by confirmative factor analysis. In Study 2 with a new sample (N = 376), the results of Study 1 are largely confirmed. It is found that the factorial structure of the TMS-F is in accordance with expectations, that all scales are sufficiently homogeneous and reliable to interpret the sum scores, and that these results are stable across independent samples. The relative importance of the six determinants of the motivation to engage in the treatment and the generalizability of the results are discussed.