bluuebunny/crossref_metadata_2025_split huggingface dataset:
Role of Air–Sea Interaction in the Long Persistence of El Niño–Induced North Indian Ocean Warming*
Authors: Du Yan , Xie Shang-Ping , Huang Gang , Hu Kaiming 
Published: October 2008

Abstract
El Niño induces a basin-wide increase in tropical Indian Ocean (TIO) sea surface temperature (SST) with a lag of one season. The north IO (NIO), in particular, displays a peculiar double-peak warming with the second peak larger in magnitude and persisting well through the summer. Motivated by recent studies suggesting the importance of the TIO warming for the Northwest Pacific and East Asian summer monsoons, the present study investigates the mechanisms for the second peak of the NIO warming using observations and general circulation models. This analysis reveals that internal air–sea interaction within the TIO is key to sustaining the TIO warming through summer. During El Niño, anticyclonic wind curl anomalies force a downwelling Rossby wave in the south TIO through Walker circulation adjustments, causing a sustained SST warming in the tropical southwest IO (SWIO) where the mean thermocline is shallow. During the spring and early summer following El Niño, this SWIO warming sustains an antisymmetric pattern of atmospheric anomalies with northeasterly (northwesterly) wind anomalies north (south) of the equator. Over the NIO as the mean winds turn into southwesterly in May, the northeasterly anomalies force the second SST peak that persists through summer by reducing the wind speed and surface evaporation. Atmospheric general circulation model experiments show that the antisymmetric atmospheric pattern is a response to the TIO warming, suggestive of their mutual interaction. Thus, ocean dynamics and Rossby waves in particular are important for the warming not only locally in SWIO but also on the basin-scale north of the equator, a result with important implications for climate predictability and prediction.
The Response of Northern Hemisphere Snow Cover to a Changing Climate*
Authors: Brown Ross D. , Mote Philip W. 
Published: October 2008

Abstract
A snowpack model sensitivity study, observed changes of snow cover in the NOAA satellite dataset, and snow cover simulations from the Coupled Model Intercomparison Project phase 3 (CMIP3) multimodel dataset are used to provide new insights into the climate response of Northern Hemisphere (NH) snow cover. Under conditions of warming and increasing precipitation that characterizes both observed and projected climate change over much of the NH land area with seasonal snow cover, the sensitivity analysis indicated snow cover duration (SCD) was the snow cover variable exhibiting the strongest climate sensitivity, with sensitivity varying with climate regime and elevation. The highest snow cover–climate sensitivity was found in maritime climates with extensive winter snowfall—for example, the coastal mountains of western North America (NA). Analysis of trends in snow cover duration during the 1966–2007 period of NOAA data showed the largest decreases were concentrated in a zone where seasonal mean air temperatures were in the range of −5° to +5°C that extended around the midlatitudinal coastal margins of the continents. These findings were echoed by the climate models that showed earlier and more widespread decreases in SCD than annual maximum snow water equivalent (SWEmax), with the zone of earliest significant decrease located over the maritime margins of NA and western Europe. The lowest SCD–climate sensitivity was observed in continental interior climates with relatively cold and dry winters, where precipitation plays a greater role in snow cover variability. The sensitivity analysis suggested a potentially complex elevation response of SCD and SWEmax to increasing temperature and precipitation in mountain regions as a result of nonlinear interactions between the duration of the snow season and snow accumulation rates.
Turbulent Channel Flows on a Rotating Earth
Authors: Handler Robert A. , Mied Richard P. , Lindemann Gloria J. , Evans Thomas E. 
Published: October 2008

Abstract
This paper deals with flow in a rectilinear channel on a rotating earth. The flow is directed perpendicular to the background planetary vorticity; both an analytical theory and numerical simulations are employed. The analytical approach assumes the existence of an eddy viscosity and employs a perturbation expansion in powers of the reciprocal of the Rossby number (Ro). At lowest order, a cross-channel circulation arises because of the tilting of the planetary vorticity vector by the shear in the along-channel direction. This circulation causes a surface convergence, which achieves its maximum value at a channel aspect ratio (= width/depth) of approximately 10. The location of the maximum surface convergence moves from near the center of the channel to a position very near the sidewalls as the aspect ratio increases from O(1) to O(100). To include the effects of turbulence, direct numerical pseudospectral simulations of the equations of motion are employed. While holding the friction Reynolds number fixed at 230.27, a series of simulations with increasing rotation (Ro = ∞, 10, 1.0, 0.1) are performed. The channelwide circulation cell observed in the analytical theory occurs for the finite Rossby number, but is displaced by lateral self-advection. In addition, turbulence-driven corner circulations appear, which make the along-channel maximum velocity appear at a subsurface location. The most interesting effect is the segregation of the turbulence to one side of the channel, while the turbulence is suppressed on the opposite side.
Potential Vorticity Diagnosis of a Tropopause Polar Cyclone
Authors: Cavallo Steven M. , Hakim Gregory J. 
Published: October 2008

Abstract
Long-lived coherent vortices located near the tropopause are often found over polar regions. Although these vortices are a commonly observed feature of the Arctic, and can have lifetimes longer than one month, little is known about the mechanisms that control their evolution. This paper examines mechanisms of intensity change for a cyclonic tropopause polar vortex (TPV) using an Ertel potential vorticity (EPV) diagnostic framework. Results from a climatology of intensifying cyclonic TPVs suggest that the essential dynamics are local to the vortex, rather than a consequence of larger-scale processes. This fact motivates a case study using a numerical model to investigate the role of diabatic mechanisms in the growth and decay of a particular cyclonic vortex. A component-wise breakdown of EPV reveals that cloud-top radiational cooling is the primary diabatic mechanism that intensifies the TPV during the growth phase. Increasing amounts of moisture become entrained into the vortex core at later times near Hudson Bay, allowing the destruction of potential vorticity near the tropopause due to latent heat release to become comparable to the radiational tendency to create potential vorticity.
Efficient Parameterization of the Observation Error Covariance Matrix for Square Root or Ensemble Kalman Filters: Application to Ocean Altimetry
Authors: Brankart Jean-Michel , Ubelmann Clément , Testut Charles-Emmanuel , Cosme Emmanuel , Brasseur Pierre , Verron Jacques 
Published: October 2008

Abstract
In the Kalman filter standard algorithm, the computational complexity of the observational update is proportional to the cube of the number y of observations (leading behavior for large y). In realistic atmospheric or oceanic applications, involving an increasing quantity of available observations, this often leads to a prohibitive cost and to the necessity of simplifying the problem by aggregating or dropping observations. If the filter error covariance matrices are in square root form, as in square root or ensemble Kalman filters, the standard algorithm can be transformed to be linear in y, providing that the observation error covariance matrix is diagonal. This is a significant drawback of this transformed algorithm and often leads to an assumption of uncorrelated observation errors for the sake of numerical efficiency. In this paper, it is shown that the linearity of the transformed algorithm in y can be preserved for other forms of the observation error covariance matrix. In particular, quite general correlation structures (with analytic asymptotic expressions) can be simulated simply by augmenting the observation vector with differences of the original observations, such as their discrete gradients. Errors in ocean altimetric observations are spatially correlated, as for instance orbit or atmospheric errors along the satellite track. Adequately parameterizing these correlations can directly improve the quality of observational updates and the accuracy of the associated error estimates. In this paper, the example of the North Brazil Current circulation is used to demonstrate the importance of this effect, which is especially significant in that region of moderate ratio between signal amplitude and observation noise, and to show that the efficient parameterization that is proposed for the observation error correlations is appropriate to take it into account. Adding explicit gradient observations also receives a physical justification. This parameterization is thus proved to be useful to ocean data assimilation systems that are based on square root or ensemble Kalman filters, as soon as the number of observations becomes penalizing, and if a sophisticated parameterization of the observation error correlations is required.
Proposed Conceptual Taxonomy for Proper Identification and Classification of Tornado Events
Authors: Agee Ernest , Jones Erin 
Published: October 2008

Abstract
A practical approach is recommended for identifying and archiving tornado events, based on the use of definitions that label all vortices as either type I, II, or III tornadoes. This methodology will provide a more meaningful tornado climatology in Storm Data, which separates and classifies all vortices associated in any manner with cumuliform clouds. Tornadoes produced within the mesocyclone of discrete supercell storms, with strong local updrafts (SLUs), will be classified as type I tornadoes. Frequently, these type I tornadoes result from the interaction of the SLU with strong rear-flank downdrafts (RFDs), or with shear vortices in the PBL. Tornadoes produced in association with quasi-linear convective systems (QLCS) will be classified as type II tornadoes (including cold pool, rear-inflow jets, bookend, and mesovortex events along the line). All other vortex types (including landspouts, waterspouts, gustnadoes, cold air vortices, and tornadoes not associated with mesocyclones or QLCS) will be labeled as type III tornadoes. A general discussion is provided that further clarifies the differences and categorization of these three classifications (which encompass 15 tornado species), along with a recommendation that NOAA adopt this taxonomy in operational and data archiving practices. Radar analysis and field observations, combined with storm-scale meteorological expertise, should allow for the official “typing” of tornado reports by NOAA personnel. Establishment of such a climatological database in Storm Data may be of value in assessing the effects (if any) of twenty-first-century global warming on U.S. tornado trends.
Perception of Stigmatization in Forensic Patients With Schizophrenia
Authors: Margetić Branimir , Aukst-Margetić Branka , Ivanec Dragutin , Filipčić Igor 
Published: October 2008

Background: The literature about perceived stigmatization of forensic patients with schizophrenia is sparse. Aims: To examine relations between the perceived stigmatization of forensic patients with schizophrenia and the intensity of the symptoms, age, regular home visiting, kind of offence, perceived family support and duration of hospitalization. Method: Sixty-two male forensic patients with schizophrenia were included. Perceived stigmatization was measured by the modified questions from the World Health Organization Disability Assessment Schedule II. Symptomatology was assessed with the Positive and Negative Syndrome Scale. Perception of family support was assessed with a visual-analogue scale. Due to different characteristics of offences and possibilities for home visiting, patients were divided into groups of those who had committed violent and non-violent offences, and those with and without the possibility of regular home visiting. Results: Symptoms have an impact on the perception of stigma. The kind of offence committed does not have a significant role in the perception of discrimination. Age was negatively correlated with the perception of stigma. Conclusion: Results might have significance for a better understanding of social relations between forensic patients and their environment and provide us with information about institutionalized forms of stigma. Results might have implications for the treatment and the quality of life of these patients.
Predicting Transitory Mood From Physical Activity Level Among People With Severe Mental Illness in Two Cultures
Authors: Mccormick Bryan P. , Frey Georgia , Lee Chien-Tsung , Chun Sanghee , Sibthorp Jim , Gajic Tomislav , Stamatovic-Gajic Branka , Maksimovich Milena 
Published: October 2008

Background: Previous studies have indicated that physical activity (PA) is positively related to health-related quality of life and well-being among people with severe mental illness (SMI). Physical activity is broadly defined in this research as any skeletal muscle movement resulting in energy expenditure, including common daily activities such as housework and gardening, as well as walking for transportation and formal exercise. Although the physical health benefits of PA are well documented, evidence suggests that PA provides psychological benefits as well. Aims: The purpose of this study was to identify if PA level was associated with transitory mood in the everyday lives of people with SMI across two cultures. Methods: Subjects were drawn through mental health centres in Serbia ( n = 12) and the USA ( n = 11). Data were collected using both experience sampling methodology and accelerometry. Data were analyzed using hierarchical linear modelling. Results: Subjects demonstrated low levels of PA, which did not differ significantly between groups. Hierarchical analysis indicated that PA remained significantly positively associated with mood after accounting for individual variation, and this was consistent across groups. Conclusions: This study reinforces previous findings that people with SMI demonstrate low PA levels generally. It also supports the consideration of physical activity interventions as a regular part of psychiatric rehabilitation. It appears that increased PA may have the potential to affect both physical health and mood among people with SMI.
How Central and Connected Am I in my Family? Bridging and Bonding Social Capital in Family Configurations of Young Adults With Psychiatric Disorders
Authors: Widmer E.D. , Orita A. , Gauthier J.-A. , Sénac N. , Cucchia A.T. , Stekel K. , Grasset F. 
Published: October 2008

Aims: This article explores the structures of relational resources that individuals with psychiatric disorders get from their family configurations using the concept of social capital. Methods: The research is based on a sample of 54 individuals with psychiatric disorders and behavioural problems, and a comparison sample of 54 individuals without a clinical record matched to the clinical respondents for age and sex. Standard measures of social capital from social network methods are applied on family configurations of individuals from both samples. Differences are tested by variance analysis. Results: Structures of family resources available to individuals with psychiatric disorders are distinct. Individuals with psychiatric disorders perceive themselves as less central in their family configurations and less connected to their family members. Their significant family members are perceived as less connected with each other. As a whole, their family configurations are smaller and do not include spouses or partners. Therefore bridging and bonding social capitals are not readily available for them. Conclusion: As family configurations of individuals with psychiatric disorders provide fewer relational resources than other families, they are not able to deal with social integration of individuals with psychiatric disorders on their own.
Imaging spontaneous tumorigenesis: inflammation precedes development of peripheral NK tumors
Authors: Rauch Dan , Gross Shimon , Harding John , Niewiesk Stefan , Lairmore Michael , Piwnica-Worms David , Ratner Lee 
Published: October 2008

AbstractEarly events in tumor development are spontaneous, microscopic, and affected by the microenvironment. We developed a mouse model of spontaneous lymphoma in which malignant transformation is coupled with light emission that can be detected noninvasively using bioluminescent imaging. The human T-cell leukemia virus (HTLV) type 1 transcriptional transactivator Tax is an oncogene sufficient to produce lymphoma in transgenic animal models. Using the granzyme B promoter to restrict Tax expression to the mature natural killer (NK)/T-cell compartment, we have reproduced many elements of HTLV-associated adult T-cell leukemia/lymphoma. Tax activates signaling cascades associated with transformation, inflammation, and tumorigenesis. Here, we report that Tax-mediated activation of luciferase in long terminal repeat-luciferase (LTR-LUC) mice serves as a reporter for imaging these processes in vivo. Using bioluminescent imaging (BLI), we discovered that microscopic intraepithelial lesions precede the onset of peripheral subcutaneous tumors, tumorigenesis progresses through early reversible stages, and Tax is sufficient for inducing tumors. Based on these findings, we propose that Tax expression in activated lymphocytes initiates a cascade of events that leads to NK/T cell recruitment, activation, and transformation. The use of BLI expands our ability to interrogate the role of Tax in tumorigenesis in vivo and has made the association of inflammation with tumor initiation amenable for study.
Abnormal spatial diffusion of Ca2+ in F508del-CFTR airway epithelial cells
Authors: Antigny Fabrice , Norez Caroline , Cantereau Anne , Becq Frédéric , Vandebrouck Clarisse 
Published: October 2008

AbstractBackgroundIn airway epithelial cells, calcium mobilization can be elicited by selective autocrine and/or paracrine activation of apical or basolateral membrane heterotrimeric G protein-coupled receptors linked to phospholipase C (PLC) stimulation, which generates inositol 1,4,5-trisphosphate (IP3) and 1,2-diacylglycerol (DAG) and induces Ca2+release from endoplasmic reticulum (ER) stores.MethodsIn the present study, we monitored the cytosolic Ca2+transients using the UV light photolysis technique to uncage caged Ca2+or caged IP3into the cytosol of loaded airway epithelial cells of cystic fibrosis (CF) and non-CF origin. We compared in these cells the types of Ca2+receptors present in the ER, and measured their Ca2+dependent activity before and after correction of F508del-CFTR abnormal trafficking either by low temperature or by the pharmacological corrector miglustat (N-butyldeoxynojirimycin).ResultsWe showed reduction of the inositol 1,4,5-trisphosphate receptors (IP3R) dependent-Ca2+response following both correcting treatments compared to uncorrected cells in such a way that Ca2+responses (CF+treatmentvswild-type cells) were normalized. This normalization of the Ca2+rate does not affect the activity of Ca2+-dependent chloride channel in miglustat-treated CF cells. Using two inhibitors of IP3R1, we observed a decrease of the implication of IP3R1 in the Ca2+response in CF corrected cells. We observed a similar Ca2+mobilization between CF-KM4 cells and CFTR-cDNA transfected CF cells (CF-KM4-reverted). When we restored the F508del-CFTR trafficking in CFTR-reverted cells, the specific IP3R activity was also reduced to a similar level as in non CF cells. At the structural level, the ER morphology of CF cells was highly condensed around the nucleus while in non CF cells or corrected CF cells the ER was extended at the totality of cell.ConclusionThese results suggest reversal of the IP3R dysfunction in F508del-CFTR epithelial cells by correction of the abnormal trafficking of F508del-CFTR in cystic fibrosis cells. Moreover, using CFTR cDNA-transfected CF cells, we demonstrated that abnormal increase of IP3R Ca2+release in CF human epithelial cells could be the consequence of F508del-CFTR retention in ER compartment.
Conflicting phylogenetic signals in the SlX1/Y1 gene in Silene
Authors: Rautenberg Anja , Filatov Dmitry , Svennblad Bodil , Heidari Nahid , Oxelman Bengt 
Published: October 2008

Abstract

Background
Increasing evidence from DNA sequence data has revealed that phylogenies based on different genes may drastically differ from each other. This may be due to either inter- or intralineage processes, or to methodological or stochastic errors. Here we investigate a spectacular case where two parts of the same gene (SlX1/Y1) show conflicting phylogenies within Silene (Caryophyllaceae). SlX1 and SlY1 are sex-linked genes on the sex chromosomes of dioecious members of Silene sect. Elisanthe.

Results
We sequenced the homologues of the SlX1/Y1 genes in several Sileneae species. We demonstrate that different parts of the SlX1/Y1 region give different phylogenetic signals. The major discrepancy is that Silene vulgaris and S. sect. Conoimorpha (S. conica and relatives) exchange positions. To determine whether gene duplication followed by recombination (an intralineage process) may explain the phylogenetic conflict in the Silene SlX1/Y1 gene, we use a novel probabilistic, multiple primer-pair PCR approach. We did not find any evidence supporting gene duplication/loss as explanation to the phylogenetic conflict.

Conclusion
The phylogenetic conflict in the Silene SlX1/Y1 gene cannot be explained by paralogy or artefacts, such as in vitro recombination during PCR. The support for the conflict is strong enough to exclude methodological or stochastic errors as likely sources. Instead, the phylogenetic incongruence may have been caused by recombination of two divergent alleles following ancient interspecific hybridization or incomplete lineage sorting. These events probably took place several million years ago. This example clearly demonstrates that different parts of the genome may have different evolutionary histories and stresses the importance of using multiple genes in reconstruction of taxonomic relationships.