bluuebunny/crossref_metadata_2025_split huggingface dataset:
Tropospheric Comparisons of Vaisala Radiosondes and Balloon-Borne Frost-Point and Lyman-α Hygrometers during the LAUTLOS-WAVVAP Experiment
Authors: Suortti T. M. , Kivi R. , Kats A. , Yushkov V. , Kämpfer N. , Leiterer U. , Miloshevich L. M. , Neuber R. , Paukkunen A. , Ruppert P. , Vömel H. 
Published: March 2008

Abstract
The accuracy of all types of Vaisala radiosondes and two types of Snow White chilled-mirror hygrosondes was assessed in an intensive in situ comparison with reference hygrometers. Fourteen nighttime reference comparisons were performed to determine a working reference for the radiosonde comparisons. These showed that the night version of the Snow White agreed best with the references [i.e., the NOAA frost-point hygrometer (FPH) and University of Colorado cryogenic frost-point hygrometer (CFH)], but that the daytime version had severe problems with contamination in the humid upper troposphere. Since the RS92 performance was superior to the other radiosondes and to the day version of the Snow White, it was selected to be the working reference. According to the reference comparison, the RS92 has no bias in the mid- and lower troposphere, with deviations &lt;±5% in relative humidity (RH). In the upper troposphere, the RS92 has a ∼5% RH wet bias, which is partly due to the RS92 time lag error and the termination of the heating cycle. It was shown that the time lag effects relating to Vaisala radiosondes can be corrected. Because these were nighttime comparisons, they can be considered to be free from solar radiation effects. Neither the radiosondes nor the Snow White succeeded in reproducing reference class hygrometer profiles in the stratosphere.
According to the 29 radiosonde intercomparisons, the RS92 and the modified RS90 (FN) had the best mutual agreement and no bias. The disagreement is largest (&lt;±10% RH) at low temperatures (T ≪ −30°C), where the FN underestimated (overestimated) in high (low) ambient RH. In comparison with the RS92, the RS90 had a semilinearly increasing wet bias with decreasing temperature, where the bias was ∼10% RH at −60°C. The RS80-A suffers from a large temperature-dependent dry bias in high RH conditions, being over 30% RH at −60°C and ∼5% RH near 0°C. The RS80-A dry bias can be almost totally removed with the correction algorithm by Leiterer et al., which was chosen as the best available. The other approach tested tends to overcorrect in high RH conditions when T &lt; −50°C. For T &gt; −30°C it is ineffective and does not correct the RS80-A dry bias in high ambient RH.
Calibration Assessment of ISCCP Geostationary Infrared Observations Using HIRS
Authors: Knapp Kenneth R. 
Published: March 2008

Abstract
Infrared window (∼11 μm) brightness temperatures from global geostationary meteorological instruments were calibrated using the High Resolution Infrared Radiation Sounder (HIRS) as an independent analysis of the satellite intercalibration performed by the International Satellite Cloud Climatology Project (ISCCP). Criteria for matching geostationary observations with HIRS from previous literature were inadequate to analyze a shift in calibration due to the limited range of resulting temperatures. The result was an inability to determine the impact of a calibration error on observations of cold clouds. To better understand the calibration error, a new set of matchup criteria that collected targets at all temperatures proportionately showed a significant shift in the ISCCP calibration. Using the new criteria, it became apparent that observations of cold temperatures were biased too cold. A correction based on these results removed the bias between the geostationary and HIRS observations.
A Time Series Weather Radar Simulator Based on High-Resolution Atmospheric Models
Authors: Cheong B. L. , Palmer R. D. , Xue M. 
Published: March 2008

Abstract
A three-dimensional radar simulator capable of generating simulated raw time series data for a weather radar has been designed and implemented. The characteristics of the radar signals (amplitude, phase) are derived from the atmospheric fields from a high-resolution numerical weather model, although actual measured fields could be used. A field of thousands of scatterers is populated within the field of view of the virtual radar. Reflectivity characteristics of the targets are determined from well-known parameterization schemes. Doppler characteristics are derived by forcing the discrete scatterers to move with the three-dimensional wind field. Conventional moment-generating radar simulators use atmospheric conditions and a set of weighting functions to produce theoretical moment maps, which allow for the study of radar characteristics and limitations given particular configurations. In contrast to these radar simulators, the algorithm presented here is capable of producing sample-to-sample time series data that are collected by a radar system of virtually any design. Thus, this new radar simulator allows for the test and analysis of advanced topics, such as phased array antennas, clutter mitigation schemes, waveform design studies, and spectral-based methods. Limited examples exemplifying the usefulness and flexibility of the simulator will be provided.
Mesoscale Monitoring of Soil Moisture across a Statewide Network
Authors: Illston Bradley G. , Basara Jeffrey B. , Fiebrich Christopher A. , Crawford Kenneth C. , Hunt Eric , Fisher Daniel K. , Elliott Ronald , Humes Karen 
Published: March 2008

Abstract
Soil moisture is an important component in many hydrologic and land–atmosphere interactions. Understanding the spatial and temporal nature of soil moisture on the mesoscale is vital to determine the influence that land surface processes have on the atmosphere. Recognizing the need for improved in situ soil moisture measurements, the Oklahoma Mesonet, an automated network of 116 remote meteorological stations across Oklahoma, installed Campbell Scientific 229-L devices to measure soil moisture conditions. Herein, background information on the soil moisture measurements, the technical design of the soil moisture network embedded within the Oklahoma Mesonet, and the quality assurance (QA) techniques applied to the observations are provided. This project also demonstrated the importance of operational QA regarding the data collected, whereby the percentage of observations that passed the QA procedures increased significantly once daily QA was applied.
A Modeling Study of Typhoon Nari (2001) at Landfall. Part I: Topographic Effects
Authors: Yang Ming-Jen , Zhang Da-Lin , Huang Hsiao-Ling 
Published: March 2008

Although there have been many observational and modeling studies of tropical cyclones, understanding of their intensity and structural changes after landfall is rather limited. In this study, several 84-h cloud-resolving simulations of Typhoon Nari (2001), a typhoon that produced torrential rainfall of more than 1400 mm over Taiwan, are carried out using a quadruply nested–grid mesoscale model whose finest grid size was 2 km. It is shown that the model reproduces reasonably well Nari’s kinematic and precipitation features as well as structural changes, as verified against radar and rain gauge observations. These include the storm track, the contraction and sizes of the eye and eyewall, the spiral rainbands, the rapid pressure rise (∼1.67 hPa h−1) during landfall, and the nearly constant intensity after landfall. In addition, the model captures the horizontal rainfall distribution and some local rainfall maxima associated with Taiwan’s orography. A series of sensitivity experiments are performed in which Taiwan’s topography is reduced to examine the topographic effects on Nari’s track, intensity, rainfall distribution, and amount. Results show that the impact of island terrain on Nari’s intensity is nearly linear, with stronger storm intensity but less rainfall in lower-terrain runs. In contrast, changing the terrain heights produces nonlinear tracks with circular shapes and variable movements associated with different degrees of blocking effects. Parameter and diagnostic analyses reveal that the nonlinear track dependence on terrain heights results from the complex interactions between the environmental steering flow, Nari’s intensity, and Taiwan’s topography, whereas the terrain-induced damping effects balance the intensifying effects of latent heat release associated with the torrential rainfall in maintaining the near-constant storm intensity after landfall.
Methods for Starting the Detection of Undocumented Multiple Changepoints
Authors: Gérard-Marchant Pierre G. F. , Stooksbury David E. , Seymour Lynne 
Published: March 2008

Abstract
Four algorithms are given, as a first step toward the practical detection of undocumented multiple changepoints. These algorithms are based on the two-phase regression method of Lund and Reeves, as well as the robust method of Lazante. The result of each method is a set that contains statistically detectable changepoints; each candidate is then either independently validated as a changepoint or discarded. This is demonstrated and the methods are compared on artificial data, and then the methods are implemented on streamflow data from the Flint River in southwest Georgia. Most notably, the method based on two-phase regression was able to detect a well-known yet undocumented drop in streamflow from a local drought that no other methods have so far been able to detect.
Unstable Frontal Waves along the Kuroshio Extension with Low-Potential Vorticity Intermediate Oyashio Water
Authors: Kouketsu Shinya , Yasuda Ichiro 
Published: March 2008

Abstract
A linear stability analysis was conducted for a three-layer primitive equation model including viscosity with a basic state, which modeled the stratification and velocity fields with the vertical and horizontal variations across the Kuroshio Extension. An unstable wave with a wavelength of 220 km and a phase speed of 0.24 m s−1 propagating in the downstream direction was found to grow the fastest. Characteristics of this unstable baroclinic wave were similar to those of waves observed along the Kuroshio Extension. The growth rate of the fastest-growing waves became greater with an increase of the cross-stream difference of the potential vorticity (PV) in the intermediate layer. For a cross-frontal stratification structure without the PV gradient in the intermediate layer, which is similar to that in the Gulf Stream, the wavelength of the fastest-growing unstable wave changed to 390 km and the unstable wave had a much different structure. Thus, the unstable frontal waves observed along the Kuroshio Extension occur only for the cases when low-PV Oyashio water exists on the northern side of the main stream in the intermediate layer. The unstable frontal waves revealed in the present study greatly contribute to the formation of a clear salinity minimum in the Kuroshio Extension.
A Resonance Mechanism Leading to Wind-Forced Motions with a 2f Frequency
Authors: Danioux Eric , Klein Patrice 
Published: March 2008

Abstract
This study revisits the mechanisms that spatially reorganize wind-forced inertial motions embedded in an oceanic mesoscale eddy field. Inertial motions are known to be affected by the eddy relative vorticity, being expelled from cyclonic structures and trapped within anticyclonic ones. Using shallow water equations (involving a single baroclinic mode), the authors show that nonlinear wave–wave interactions excite, through a resonance mechanism, motions with a 2f frequency (with f being the inertial frequency) and a specific length scale. In a more general situation involving several baroclinic modes, this resonance is found to be reinforced and principally efficient for the lowest baroclinic modes. Such characteristics make the energy of the wind-forced motions potentially available to small-scale mixing through parametric subharmonic instability (not taken into account in the present study).
On the Predictability of Mesoscale Convective Systems: Two-Dimensional Simulations
Authors: Wandishin Matthew S. , Stensrud David J. , Mullen Steven L. , Wicker Louis J. 
Published: March 2008

Abstract
Mesoscale convective systems (MCSs) are a dominant climatological feature of the central United States and are responsible for a substantial fraction of warm season rainfall. Yet very little is known about the predictability of MCSs. To help alleviate this situation, a series of ensemble simulations of an MCS are performed on a two-dimensional, storm-scale (Δx = 1 km) model. Ensemble member perturbations in wind speed, relative humidity, and instability are based on current 24-h forecast errors from the North American Model (NAM). The ensemble results thus provide an upper bound on the predictability of mesoscale convective systems within realistic estimates of environmental uncertainty, assuming successful convective initiation.
The simulations are assessed by considering an ensemble member a success when it reproduces a convective system of at least 20 km in length (roughly the size of two convective cells) within 100 km on either side of the location of the MCS in the control run. By that standard, MCSs occur roughly 70% of the time for perturbation magnitudes consistent with 24-h forecast errors. Reducing the perturbations for all fields to one-half the 24-h error values increases the MCS success rate to over 90%. The same improvement in forecast accuracy would lead to a 30%–40% reduction in maximum surface wind speed uncertainty and a roughly 20% reduction in the uncertainty in maximum updraft strength, and initially slower growth in the uncertainty in the size of the MCS. However, the occurrence of MCSs drops below 50% as the midlayer mean relative humidity falls below 65%. The response of the model to reductions in forecast errors for instability, moisture, and wind speed is not consistent and cannot be easily generalized, but each can have a substantial impact on forecast uncertainty.
The New Public Management reforms in Asia: a comparison of South and Southeast Asian countries
Authors: Samaratunge Ramanie , Alam Quamrul , Teicher Julian 
Published: March 2008

It has been recognized that there is a need for a cross-country analysis that can be used to identify the factors that contribute to the problems of state incapacity in South and Southeast Asian nations. In taking up this challenge, we explore selected initiatives of new public management (NPM) in the region to analyse cross-country variations. For this purpose we have chosen four South and Southeast Asian countries, namely: Singapore, Malaysia, Sri Lanka and Bangladesh. This article examines how the contextual factors. namely political history, party politics, macroeconomic considerations, state tradition, role of International Development Agencies (IDAs) and the state of civil society, influence the nature and the outcome NPM initiatives in these four countries. We argue that contextual factors played a determining role for which Singapore and Malaysia are relatively successful on their own terms compared to Bangladesh and Sri Lanka, which failed to achieve the expected benefits from NPM reforms. Points for practitioners It has been argued that there is a need for a cross-country analysis to identify the factors that contribute to the problems of public sector reforms in South and Southeast Asian nations. In taking up this challenge, we have explored selected initiatives of new public management (NPM) to analyse cross-country variations using four South and Southeast Asian countries, namely: Singapore, Malaysia, Sri Lanka and Bangladesh. We argue that unique country-specific contextual factors have played a determining role for which Singapore and Malaysia are relatively successful on their own terms compared to Bangladesh and Sri Lanka in public management reforms.
Trust in the public sector: is there any evidence for a long-term decline?
Authors: Van de Walle Steven , Van Roosbroek Steven , Bouckaert Geert 
Published: March 2008

Concerns with declining public trust in government have become a permanent element of the contemporary political discourse. This concern also extends to levels of citizens' trust in the public administration and public services. Trust is said to be declining, and this decline is generally seen as detrimental to public service delivery. In this article, we examine the main elements in this discussion, review the existing international survey data and summarize the main findings for Organization for Economic Co-operation and Development (OECD) countries. Citizens' trust in the public sector is found to fluctuate, and the data generally do not show consistently declining levels of trust. Furthermore, in some countries there simply are insufficient data to come to any conclusions at all about time trends in citizen trust in the public sector. Points for practitioners This article summarizes some of the survey material on citizens' trust in the public administration. It allows practitioners to compare trends in public trust in their country across time and space. The findings lead us to reject the hypothesis of a universal decline of trust in the public sector. The article warns against using opinion poll results without considering context. The long-term and comparative perspective on citizens' trust in the public sector is all too often absent from the policy discourse that is frequently based on assumptions and ad hoc approaches.
Management of the new pay systems in the public sector — some implications of insights gained from experiments
Authors: Bregn Kirsten 
Published: March 2008

During recent decades, new pay systems have been widely introduced in Organization for Economic Co-operation and Development (OECD) countries. Experiments draw attention to some aspects which are normally not included in analyses of pay systems, namely fairness and reciprocity. Furthermore, the experiments indicate a different understanding of what are perceived as gains and losses than what is assumed in conventional economic theory, and they also indicate an asymmetric evaluation of gains and losses. The aim of the article is to present some results from these experiments and to investigate their implications for pay systems in the public sector. The conclusion is that the results have important implications for the management of pay systems, and due to some specific characteristics of the public sector, for management of pay systems in the public sector in particular. Points for practitioners Insights gained from experiments concerning fairness, reciprocity and perceived gains and losses shed a new light on management of pay. They stress the importance of managers taking responsibility for ensuring acceptance of criteria for pay supplements and bonuses, and for a realistic formation of expectations about pay supplements and bonuses. Moreover, the managers need to ensure that supplements and bonuses are provided in accordance with the criteria in such a way that the allocation of supplements and bonuses is considered to be fair, and justified expectations are met. This can be particularly difficult in the public sector. Thus, considerable caution in relation to using the individualization of pay to motivate employees in the public sector is recommended.
The use of service channels by citizens in the Netherlands: implications for multi-channel management
Authors: Pieterson Willem , Ebbers Wolfgang 
Published: March 2008

Many governmental organizations are changing their service channel management strategies to multi-channel management. However, very few empirical studies exist that explore how these multi-channel strategies should be shaped. In this article we test a number of hypotheses on citizens' channel use behaviour and the determinants of this behaviour. Further, we take into account the differences between citizens with and without a personal computer. In our conclusions we call for multi-channel strategies that do not only incorporate the features of service channels and the front—back office integration, but also deal with personal characteristics and task characteristics. Further, digital divide issues still influence channel usage by citizens, so it is necessary to keep all channels open for citizens. Finally, our study reveals that multi-channelling is a very complex subject on which research is still in its infancy. Points for practitioners • Multi-channel management may benefit most from channel integration. • Channels have different characteristics that render them suitable for different (parts of) services. • Computer `have-nots' still rely on traditional service channels, so these should remain accessible.
Dual targeting of the proteasome regulates survival and homing in Waldenström macroglobulinemia
Authors: Roccaro Aldo M. , Leleu Xavier , Sacco Antonio , Jia Xiaoying , Melhem Molly , Moreau Anne-Sophie , Ngo Hai T. , Runnels Judith , Azab Abdelkareem , Azab Feda , Burwick Nicholas , Farag Mena , Treon Steven P. , Palladino Michael A. , Hideshima Teru , Chauhan Dharminder , Anderson Kenneth C. , Ghobrial Irene M. 
Published: March 2008

AbstractWaldenström macroglobulinemia (WM) is an incurable low-grade B-cell lymphoma characterized by high protein turnover. We dissected the biologic role of the proteasome in WM using 2 proteasome inhibitors, NPI-0052 and bortezomib. We found that NPI-0052 inhibited proliferation and induced apoptosis in WM cells, and that the combination of NPI-0052 and bortezomib induced synergistic cytotoxicity in WM cells, leading to inhibition of nuclear translocation of p65NF-κB and synergistic induction of caspases-3, -8, and -9 and PARP cleavage. These 2 agents inhibited the canonical and noncanonical NF-κB pathways and acted synergistically through their differential effect on Akt activity and on chymotrypsin-like, caspaselike, and trypsinlike activities of the proteasome. We demonstrated that NPI-0052–induced cytotoxicity was completely abrogated in an Akt knockdown cell line, indicating that its major activity is mediated through the Akt pathway. Moreover, we demonstrated that NPI-0052 and bortezomib inhibited migration and adhesion in vitro and homing of WM cells in vivo, and overcame resistance induced by mesenchymal cells or by the addition of interleukin-6 in a coculture in vitro system. Theses studies enhance our understanding of the biologic role of the proteasome pathway in WM, and provide the preclinical basis for clinical trials of combinations of proteasome inhibitors in WM.