bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Measurement Factors in Estimating Snowfall Derived from Snow Cover Surfaces Using Acoustic Snow Depth Sensors
Authors: Fischer Alexandre P. 
Published: November 2010

Abstract
At three Canadian test locations during the cold seasons of 2006 and 2007/08, snowfall measurements are derived from changes in the total depth of snow on the ground using multiple Campbell Scientific, Inc., SR50 ultrasonic ranging sensors over very short (minute–hour) time scales. Data analysis reveals that, because of the interplay of numerous essential factors that influence snow cover levels, the measurements exhibit a strong dependence on the time interval between consecutive measurements used to generate the snowfall value. This finding brings into question the reasonable accuracy of snowfall measurements that are derived from the snow cover surface using automated methods over very short time scales. In this study, two mathematical methods are developed to assist in quantifying the magnitude of the snowfall measurement error. From time-series analysis, the suggested characteristics of the snowdrift signal in the snow depth time series is shown by using measurements taken by FlowCapt Snowdrift acoustic sensors. Furthermore, the use of three collocated SR50s shows that repeated snow depth measurements represent three pairwise essentially different time series. These results question the reasonable accuracy of snowfall measurements derived using only a single ultrasonic ranging sensor, especially in cases in which the snow cover is redistributed by the wind and in which snow depth spatial variability is prominent.
The Cumulative Impact of Cloud Droplet Nucleating Aerosols on Orographic Snowfall in Colorado
Authors: Saleeby Stephen M. , Cotton William R. , Fuller Jamie D. 
Published: November 2010

Abstract
Hygroscopic pollution aerosols have the potential to alter winter orographic snowfall totals and spatial distributions by modification of high-elevation supercooled orographic clouds and the riming process. The authors investigate the cumulative effect of varying the concentrations of hygroscopic aerosols during January–February for four recent winter snowfall seasons over the high terrain of Colorado. Version 6.0 of the Regional Atmospheric Modeling System (RAMS) is used to determine the particular mountain ranges and seasonal conditions that are most susceptible. Multiple winter seasonal simulations are run at both 3- and 1-km horizontal grid spacing with varying aerosol vertical profiles. Model-predicted snowfall accumulation trends are compared with automated snow water equivalent observations at high-elevation sites. An increase in aerosol concentration leads to reduced riming of cloud water by ice particles within supercooled, liquid orographic clouds, thus leading to lighter rimed hydrometers with slower fall speeds and longer horizontal trajectories. This effect results in a spillover of snowfall from the windward slope to the leeward slope. A snowfall spillover effect is most evident in the southern and western regions of the San Juan Range where high-moisture-laden storms are more prevalent. The effect over the Park Range is also present in each simulated season, but with lower amplitudes and slightly varying magnitudes among seasons. Seasons with greater overall snowfall exhibit a greater response in magnitude and percentage change. The smallest spillover effect occurred downwind of the primary western slope mountain barriers. Although the aerosol effect on snowfall can be locally significant in particularly wet winter seasons, the interseasonal variability in synoptic conditions can impose much larger widespread changes in snowfall accumulation.
What is the Mechanism for the Modification of Convective Cloud Distributions by Land Surface–Induced Flows?
Authors: Garcia-Carreras Luis , Parker Douglas J. , Marsham John H. 
Published: November 2010

AbstractThe aim of this study is to determine the mechanism that modulates the initiation of convection within convergence zones caused by land surface–induced mesoscale flows. An idealized modeling approach linked quantitatively to observations of vegetation breezes over tropical Benin was used. A large-eddy model was used with a prescribed land surface describing heterogeneities between crop and forest over which vegetation breezes have been observed. The total surface fluxes were constant but the Bowen ratio varied with vegetation type. The heterogeneous land surface created temperature differences consistent with observations, which in turn forced mesoscale winds and convection at the convergence zones over the crop boundaries. At these convergence zones optimum conditions for the initiation of convection were found in the afternoon; the equivalent potential temperature was higher in the convergence zones than over anywhere else in the domain, due to reduced entrainment, and the mesoscale convergence produced a persistent increase in vertical wind velocities of up to 0.5 m s−1 over a 5–10-km region. The relative importance of these two mechanisms depended on the synoptic conditions. When convective inhibition was weak, the thermodynamic conditions at the convergence zone were most important, as the triggering of convection was easily accomplished. However, when the thermodynamic profile inhibited convection, the mesoscale updrafts became essential for triggering in order to break through the inhibiting barrier. At the same time, subsidence over the forest produced a warm capping layer over the boundary layer top that suppressed convection over the forest throughout the afternoon.
Variability of the Atlantic Meridional Mode during the Atlantic Hurricane Season
Authors: Smirnov Dimitry , Vimont Daniel J. 
Published: November 2010

Abstract
An observational and modeling study is conducted to investigate the structure of the Atlantic Meridional Mode (AMM) during the Atlantic hurricane season, and the relationship between AMM-related SST anomalies and environmental conditions that influence seasonal tropical cyclone activity. The observational analysis shows that during the Atlantic hurricane season the AMM exhibits a similar SST and low-level wind structure as during boreal spring (when the AMM is most active). Observed AMM SST variations are accompanied by air temperature and moisture anomalies that are limited to the boundary layer and an anomalous baroclinic circulation structure in the northern subtropical Atlantic with an anomalous lower-level cyclonic circulation residing under an anomalous upper-level anticyclone during a warm phase. This baroclinic structure contributes to a reduction in vertical wind shear over the tropical Atlantic that is dominated by changes in the upper-level flow.
Two sets of model experiments were conducted, in which the NCAR Community Atmospheric Model version 3.1 (CAM3.1) was coupled to a slab ocean model or a data ocean model. In each experiment, the model was either initialized with or forced by AMM-like SST anomalies during boreal summer. The simulations yielded a similar spatial structure to that in the observations, including the baroclinic atmospheric circulation and associated reduction in vertical wind shear. The similarity between the modeled and observed AMM structures strongly suggests a causal relationship in which the AMM-like SST anomalies are responsible for generating environmental conditions that can strongly influence seasonal tropical cyclone variability.
Understanding ENSO Regime Behavior upon an Increase in the Warm-Pool Temperature Using a Simple ENSO Model
Authors: Kim Baek-Min , An Soon-Il 
Published: November 2010

Abstract
The regime behavior of the low-order El Niño–Southern Oscillation (ENSO) model, according to an increase in the radiative–convective equilibrium sea surface temperature (SST; Tr), is studied to provide a possible explanation for the observed increase in ENSO irregularity characterized by decadal modulation. During recent decades, a clear increasing trend of the warm-pool SST has been observed. In this study, the increase in the warm-pool maximum SST is interpreted as an increase in Tr following previous studies. A bifurcation analysis with Tr as a control parameter is conducted to reveal that the degree of ENSO irregularity in the model is effectively controlled by the equilibrium states of the model. At a critical value of Tr, bifurcation analysis reveals that period-doubling bifurcation occurs and an amplitude-modulated ENSO emerges. At this point, a subcycle appears within the preexisting ENSO cycle, which initiates decadal modulation of ENSO. As Tr increases further, nested oscillations are successively generated, illustrating clear decadal modulation of ENSO. The qualitative regime changes revealed in this study are supported by the observation of regime shifts in the 1970s. With increasing Tr, the mean zonal SST gradient increases, and the model adjusts toward a “La Niña–like” mean state. Further constraint with shoaling of the mean thermocline depth and increasing stratification causes ENSO to exhibit stronger amplitude modulation. Furthermore, the timing of the period-doubling bifurcation advances with these two effects.
A Global View on the Wind Sea and Swell Climate and Variability from ERA-40
Authors: Semedo Alvaro , Sušelj Kay , Rutgersson Anna , Sterl Andreas 
Published: November 2010

Abstract
In this paper a detailed global climatology of wind-sea and swell parameters, based on the 45-yr European Centre for Medium-Range Weather Forecasts Re-Analysis (ERA-40) wave reanalysis is presented. The spatial pattern of the swell dominance of the earth’s oceans, in terms of the wave field energy balance and wave field characteristics, is also investigated. Statistical analysis shows that the global ocean is strongly dominated by swell waves. The interannual variability of the wind-sea and swell significant wave heights, and how they are related to the resultant significant wave height, is analyzed over the Pacific, Atlantic, and Indian Oceans. The leading modes of variability of wind sea and swell demonstrate noticeable differences, particularly in the Pacific and Atlantic Oceans. During the Northern Hemisphere winter, a strong north–south swell propagation pattern is observed in the Atlantic Ocean. Statistically significant secular increases in the wind-sea and swell significant wave heights are found in the North Pacific and North Atlantic Oceans.
Spatial and Temporal Transferability of a Distributed Energy-Balance Glacier Melt Model
Authors: MacDougall Andrew H. , Flowers Gwenn E. 
Published: November 2010

Abstract
Modeling melt from glaciers is crucial to assessing regional hydrology and eustatic sea level rise. The transferability of such models in space and time has been widely assumed but rarely tested. To investigate melt model transferability, a distributed energy-balance melt model (DEBM) is applied to two small glaciers of opposing aspects that are 10 km apart in the Donjek Range of the St. Elias Mountains, Yukon Territory, Canada. An analysis is conducted in four stages to assess the transferability of the DEBM in space and time: 1) locally derived model parameter values and meteorological forcing variables are used to assess model skill; 2) model parameter values are transferred between glacier sites and between years of study; 3) measured meteorological forcing variables are transferred between glaciers using locally derived parameter values; 4) both model parameter values and measured meteorological forcing variables are transferred from one glacier site to the other, treating the second glacier site as an extension of the first. The model parameters are transferable in time to within a &lt;10% uncertainty in the calculated surface ablation over most or all of a melt season. Transferring model parameters or meteorological forcing variables in space creates large errors in modeled ablation. If select quantities (ice albedo, initial snow depth, and summer snowfall) are retained at their locally measured values, model transferability can be improved to achieve ≤15% uncertainty in the calculated surface ablation.
Causal attributions, pathway to care and clinical features of first-episode psychosis: A South African perspective
Authors: Burns Jonathan K. , Jhazbhay Khatija , Emsley Robin A. 
Published: November 2010

Background: Causal belief systems and help-seeking practices may impact on pathway to care and features of first-episode psychosis (FEP) that have prognostic value. This is particularly relevant in South Africa where many people subscribe to traditional belief systems and consult traditional healers. Aim: To evaluate the relationship between causal attributions and pathway to care and features of FEP that have prognostic value. Method: We tested associations between causal attributions and pathway to care and duration of untreated psychosis (DUP), age of onset, PANSS-rated positive, negative and general symptoms and depressive symptoms (Calgary Depression Scale) in a sample of 54 FEP patients. Results: Spiritual attribution of cause (49% of patients) was associated with long DUP, while consultation with a traditional healer (39% of patients) was associated with long DUP and high negative symptoms. Only 19% had consulted a psychiatrist. Seventy nine per cent (79%) were referred to hospital by family, police were involved in 44% of admissions, and 81% were admitted involuntarily. Conclusions: Spiritual attributions of cause and previous consultation with traditional healers may delay entry to psychiatric care and thereby negatively impact on prognosis of FEP. This highlights the importance of mental health education and developing a positive collaborative relationship with traditional healers, especially in low- and middle-income countries.
Correlation between cerebral tissue and central venous oxygen saturation during off-pump coronary bypass graft surgery
Authors: Harilall Yakeen , Adam Jamila K , Biccard Bruce M , Reddi Anu 
Published: November 2010

We compared simultaneous regional cerebral oxygen saturation and central venous oxygen saturation at different time periods in 20 adult patients (median age, 57.9; range, 35 to 76 years) undergoing off-pump coronary artery bypass (OPCAB) graft surgery (n= 20). Mean arterial pressure (MAP), partial pressure of carbon dioxide (PcvCO2), heart rate, haematocrit (Hct), lactate and patient oxygen saturation (SpO2) were also recorded as a secondary analysis to determine independent predictors of cerebral desaturation and interactions between predictors. The cross-sectional analysis performed at each time point showed several significant moderate to strong positive correlations between central venous oxygen saturation and both right and left cerebral oxygen saturations; however, right cerebral saturations correlated better with central venous saturations than left cerebral saturation. Partial pressure of carbon dioxide (PcvCO2) was identified as a major predictor of cerebral saturation 0.59 ( p < 0.001). Central venous saturation can be used as a surrogate measure of cerebral oxygen saturation during OPCAB surgery.
The immediate effects of diacutaneous fibrolysis on pain and mobility in patients suffering from painful shoulder: a randomized placebo-controlled pilot study
Authors: Barra ME , López C , Fernández G , Murillo E , Villar E , Raya L 
Published: November 2010

Objectives: To describe the immediate effects of diacutaneous fibrolysis on pain and mobility in patients suffering from painful shoulder, and to assess the ability of the placebo technique to blind participants to group allocation. Design: A double-blind before–after randomized placebo-controlled pilot study. Setting: Two public centres of Primary Health Care of the Spanish National Health System. Participants: Fifty patients (29 women, 21 men) with a diagnosis of painful shoulder of subacromial origin were included. Intervention: Participants were randomly allocated to one of two groups. The intervention group ( N = 25) was actually treated with diacutaneous fibrolysis, while the placebo group ( N = 25) was treated with placebo diacutaneous fibrolysis. Measurements: Active range of motion (flexion, abduction, extension, external and internal rotation) and pain intensity in the hand-behind-back position were measured. Participants were also asked about their perception in terms of comfort of the technique and results obtained. Results: Between-groups differences were significant in flexion (mean 11.4 degrees; 95% confidence interval (CI) 5.7–17.1), abduction (mean 7.2 degrees; 95% CI 2.0–12.5) and internal rotation movements (mean 3.1 cm; 95% CI 0.1–6.1). There were no significant differences between groups in pain intensity, extension or external rotation movements. The placebo technique showed its ability to blind participants to group allocation. None of the participants suffered any adverse effects from diacutaneous fibrolysis. Conclusion: Diacutaneous fibrolysis may be an effective and safe therapeutic option to improve active range of motion in patients suffering from painful shoulder.
A pragmatic randomized controlled study of the effectiveness and cost consequences of exercise therapy in hip osteoarthritis
Authors: Juhakoski Riikka , Tenhonen Seppo , Malmivaara Antti , Kiviniemi Vesa , Anttonen Tapio , Arokoski Jari PA 
Published: November 2010

Objective: To evaluate the short- and long-term effectiveness of exercise training in relation to pain, function and direct costs to health care systems attributable to hip osteoarthritis. Design: Prospective, two-year randomized controlled trial. Setting: An outpatient primary health care setting. Subjects: One hundred and twenty men and women aged from 55 to 80, with radiologically diagnosed hip osteoarthritis with associated clinical symptoms. Interventions: The combined exercise and general practitioner (GP) care group received 12 supervised (once per week) exercise sessions at the baseline and four additional booster sessions one year later. Both groups received standard GP care. Main measures: The WOMAC Osteoarthritis Index, physical functioning score of RAND-36 (SF-36), the use and health care system costs of doctor visits and physiotherapy associated with hip osteoarthritis, number of total hip replacements, the use of analgesic and non-steroidal anti-inflammatory drugs (NSAIDs), performance-based outcome scores and body mass index (BMI). Results: There were no differences between the groups with respect to WOMAC hip pain, physical functioning score of RAND-36, performance-based outcome scores or BMI. The effect of the exercise intervention on WOMAC function was statistically significant at 6 months (mean = −7.5; 95% confidence interval (CI) −13.9 to −1.0; P = 0.02) and 18 months (mean = −7.9; 95% CI −15.3 to −0.4; P = 0.04). There were no statistically significant differences in the total health care system costs between the groups. Conclusion: The mostly home-based exercise training programme provided in this study did not result in reduced hip pain over the two-year follow-up period.
A ‘Simple’ Solution Proposal for Riverbank Settlement Problems in Surabaya
Authors: Soemarno Ispurwono 
Published: November 2010

In most large cities of developing countries, rapid urbanization has created many problems concerning the uncontrolled development of informal settlements. Some urban migrants select riverbanks for their settlements because these areas are accessible with very low costs and are strategically located to areas that can support their economic activities. The rapid development of these settlements is supported by the weak control of local authorities. This kind of development has implications for the safety and security of the environment. The uncontrolled development of riverbank settlements could narrow the river and increase the chance of flooding. Riverbank settlements could reduce the river water velocity, resulting in flood control distur-bance. They could also cause disruption in river maintenance such as difficulty in deepening the river due to limited available space. In Surabaya, the local government has been making an effort to formulate appropriate policies to deal with riverbank settlements. The local government commissioned a study on riverbank settlements in 2002. The aim of the study was to understand how riverbank settlements developed, the social economic profile of riverbank residents, the residents’ perception on land tenure, relocation, and so on. The research was done through field observations, respondent identification, interviews with the respondents and aerial photograph support. The research findings and recommendations provided the local government with basic inputs for their policies on riverbank settlements. Reaching an understanding with the riverbank residents was crucial for the successful implementation of the policy.
The association of bile acid excretion and atherosclerotic coronary artery disease
Authors: Charach Gideon , Grosskopf Itamar , Rabinovich Alexander , Shochat Michael , Weintraub Moshe , Rabinovich Pavel 
Published: November 2010

Background: Excess cholesterol is usually eliminated from the body by conversion to bile acids excreted in feces as bile salts. The excretion of large amounts of bile protects against atherosclerosis, while diminished excretion may lead to coronary artery disease (CAD).Objective: To investigate a relationship between CAD and bile acid excretion.Methods: Bile acid excretion was compared between 36 patients with proven CAD and 37 CAD-free individuals (controls). The groups were comparable for demographics and selected risk factors. All subjects received a 4-day standard diet that included ∼500 mg of cholesterol. Fecal bile acids from 24-hour stool collections were measured by gas liquid chromatography.Results: CAD patients excreted lower amounts of total bile acids (358 ± 156 mg) than controls (617 ± 293 mg; p < 0.01) and less deoxycholic acid (188.29 ± 98.12 mg versus 325.96 ± 198.57 mg; p < 0.0001) and less lithocholic acid (115.43 ± 71.89 mg versus 197.27 ± 126.87 mg; p < 0.01). Advanced age, male gender, left ventricular ejection fraction and total bile acid levels were significant independent factors that predicted CAD ( p < 0.05). Mortality, CAD and cerebrovascular accident development rates were significantly lower for the controls at the 13-year follow up.Conclusion: CAD patients have significantly decreased bile acid excretion levels than non-CAD patients. An impaired ability to excrete cholesterol may be an additional risk factor for CAD development.
Indoleamine 2,3-dioxygenase specific, cytotoxic T cells as immune regulators
Authors: Sørensen Rikke Bæk , Hadrup Sine Reker , Svane Inge Marie , Hjortsø Mads Christian , thor Straten Per , Andersen Mads Hald 
Published: November 2010

AbstractIndoleamine 2,3-dioxygenase (IDO) is an immunoregulatory enzyme that is implicated in suppressing T-cell immunity in normal and pathologic settings. Here, we describe that spontaneous cytotoxic T-cell reactivity against IDO exists not only in patients with cancer but also in healthy persons. We show that the presence of such IDO-specific CD8+ T cells boosted T-cell immunity against viral or tumor-associated antigens by eliminating IDO+ suppressive cells. This had profound effects on the balance between interleukin-17 (IL-17)–producing CD4+ T cells and regulatory T cells. Furthermore, this caused an increase in the production of the proinflammatory cytokines IL-6 and tumor necrosis factor-α while decreasing the IL-10 production. Finally, the addition of IDO-inducing agents (ie, the TLR9 ligand cytosine-phosphate-guanosine, soluble cytotoxic T lymphocyte–associated antigen 4, or interferon γ) induced IDO-specific T cells among peripheral blood mononuclear cells from patients with cancer as well as healthy donors. In the clinical setting, IDO may serve as an important and widely applicable target for immunotherapeutic strategies in which IDO plays a significant regulatory role. We describe for the first time effector T cells with a general regulatory function that may play a vital role for the mounting or maintaining of an effective adaptive immune response. We suggest terming such effector T cells “supporter T cells.”