bluuebunny/crossref_metadata_2025 huggingface dataset:
The Tropical Atmospheric Energy Budget from the TRMM Perspective. Part II: Evaluating GCM Representations of the Sensitivity of Regional Energy and Water Cycles to the 1998–99 ENSO Cycle
Authors: L’Ecuyer Tristan S. , Stephens Graeme L.
Published: October 2007

The impact of clouds and precipitation on the climate is a strong function of their spatial distribution and microphysical properties, characteristics that depend, in turn, on the environments in which they form. Simulating feedbacks between clouds, precipitation, and their surroundings therefore places an enormous burden on the parameterized physics used in current climate models. This paper uses multisensor observations from the Tropical Rainfall Measuring Mission (TRMM) to assess the representation of the response of regional energy and water cycles in the tropical Pacific to the strong 1998 El Niño event in (Atmospheric Model Intercomparison Project) AMIP-style simulations from the climate models that participated in the Intergovernmental Panel on Climate Change’s (IPCC’s) most recent assessment report. The relationship between model errors and uncertainties in their representation of the impacts of clouds and precipitation on local energy budgets is also explored.

With the exception of cloud radiative impacts that are often overestimated in both regions, the responses of atmospheric composition and heating to El Niño are generally captured in the east Pacific where the SST forcing is locally direct. Many models fail, however, to correctly predict the magnitude of induced trends in the west Pacific where the response depends more critically on accurate representation of the zonal atmospheric circulation. As a result, a majority of the models examined do not reproduce the apparent westward transport of energy in the equatorial Pacific during the 1998 El Niño event. Furthermore, the intermodel variability in the responses of precipitation, total heating, and vertical motion is often larger than the intrinsic ENSO signal itself, implying an inherent lack of predictive capability in the ensemble with regard to the response of the mean zonal atmospheric circulation in the tropical Pacific to ENSO. While ENSO does not necessarily provide a proxy for anthropogenic climate change, the results suggest that deficiencies remain in the representation of relationships between radiation, clouds, and precipitation in current climate models that cannot be ignored when interpreting their predictions of future climate.
Abrupt Climate Changes Observed in Late August over Central Japan between 1983 and 1984
Authors: Inoue Tomoshige , Matsumoto Jun
Published: October 2007

Interdecadal climate changes occurring during the latter half of August (LA) in central Japan are described, and the associated changes in rainfall, typhoon tracks, and circulation patterns over East Asia and the western North Pacific (WNP) regions are investigated. Since 1984, rates of sunshine and temperature have increased, while rainfall has decreased significantly during LA in central Japan. In contrast, rainfall over the Southwest Islands, northern part of Taiwan, and in the south of the middle and lower reaches of the Yangtze River in China has increased. Changes in the positions and tracks of typhoons are responsible for these changes. Prior to 1983, many typhoons approached the central-western part of Japan during LA, while after 1984, most typhoons were deflected away from Japan and moved northwestward to Taiwan and China. The North Pacific subtropical high during LA extended more westward after 1984, which affected the interdecadal changes in sunshine, temperature, rainfall, and typhoon tracks, not only in central Japan, but also over East Asia and the WNP regions.
Diagnosing the 2005 Drought in Equatorial East Africa
Authors: Hastenrath Stefan , Polzin Dierk , Mutai Charles
Published: October 2007

Equatorial East Africa suffered severe drought during its 2005 “short rains,” centered on October–November. The circulation mechanisms of such precipitation anomalies are examined, using long-term upper-air and surface datasets, and based on diagnostic findings from earlier empirical investigations. The steep eastward pressure gradient is conducive to fast westerlies over the central-equatorial Indian Ocean, surface manifestation of a powerful zonal circulation cell with subsidence over East Africa, and ascending motion over Indonesia. With fast westerlies, rainfall in East Africa is deficient and they tend to be accompanied by anomalously cold waters in the northwestern and warm anomalies in the southeastern extremity of the equatorial Indian Ocean Basin, without any seesaw between these domains. In October–November 2005, pressure in the west was anomalously high, entailing a steep eastward pressure gradient along the equator, conducive to fast westerlies and, further symptomatic of the zonal circulation cell, subsidence in the west and ascending motion in the east were enhanced. Overall, the chain of causalities can be traced to anomalously high pressure in the west.
Experimental Implementation of an Ensemble Adjustment Filter for an Intermediate ENSO Model
Authors: Karspeck Alicia R. , Anderson Jeffrey L.
Published: October 2007

The assimilation of sea surface temperature (SST) anomalies into a coupled ocean–atmosphere model of the tropical Pacific is investigated using an ensemble adjustment Kalman filter (EAKF). The intermediate coupled model used here is the operational version of the Zebiak–Cane model, called LDEO5. The assimilation is applied as a means of estimating the true state of the system in the presence of incomplete observations of the state.

In the first part of this study assimilation is performed under the “perfect model” assumption, where SST observations are synthetically derived from a trajectory of the model. The focus is on how and why changes in the filter parameters (ensemble size, covariance localization, and covariance inflation) affect the quality of the analysis. It is shown that isotropic covariance localization does not benefit the analysis even when a small number of ensemble members are used. These results suggest that destruction of the “balance” between variables caused by localization is more detrimental than spurious correlation due to small ensemble size.

In the second part of this study the EAKF is used to assimilate an independent dataset of SST observations. The EAKF/Zebiak–Cane assimilation system is able to correctly estimate the phase and intensity of ENSO, as measured by the average SST anomaly in the eastern equatorial Pacific. A comparison of the analysis herein to independent wind stress and thermocline depth datasets suggests that even with the assimilation of only SST observations it is possible to reproduce over 70% of the interannual variability of thermocline depth in the eastern equatorial Pacific and off the coast of the Philippine Islands. The interannual variability of zonal wind stress in the central and western equatorial Pacific is also well correlated with independent observations (R > 0.75).
A Comparison of Cloud Cover Statistics from the GLAS Lidar with HIRS
Authors: Wylie Donald , Eloranta Edwin , Spinhirne James D. , Palm Steven P.
Published: October 2007

The cloud dataset from the Geoscience Laser Altimeter System (GLAS) lidar on the Ice, Cloud, and Land Elevation Satellite (ICESat) spacecraft is compared to the cloud analysis of the Wisconsin NOAA High Resolution Infrared Radiation Sounder (HIRS) Pathfinder. This is the first global lidar dataset from a spacecraft of extended duration that can be compared to the HIRS climatology. It provides an excellent source of cloud information because it is more sensitive to clouds that are difficult to detect, namely, thin cirrus and small boundary layer clouds. The second GLAS data collection period from 1 October to 16 November 2003 was used for this comparison, and a companion dataset of the same days were analyzed with HIRS. GLAS reported cloud cover of 0.70 while HIRS reported slightly higher cloud cover of 0.75 for this period. The locations where HIRS overreported cloud cover were mainly in the Arctic and Antarctic Oceans and parts of the Tropics.

GLAS also confirms that upper-tropospheric clouds (above 6.6 km) cover about 0.33 of the earth, similar to the reports from HIRS data. Generally, the altitude of the cloud tops reported by GLAS is, on average, higher than HIRS by 0.4 to 4.5 km. The largest differences were found in the Tropics, over 4 km, while in midlatitudes average differences ranged from 0.4 to 2 km. Part of this difference in averaged cloud heights comes from GLAS finding more high cloud coverage in the Tropics, 5% on average but >13% in some areas, which weights its cloud top average more toward the high clouds than the HIRS. The diffuse character of the upper parts of high clouds over tropical oceans is also a cause for the difference in reported cloud heights.

Statistics on cloud sizes also were computed from GLAS data to estimate the errors in cloud cover reported by HIRS from its 20-km field-of-view (FOV) size. Smaller clouds are very common with one-half of all clouds being <41 km in horizontal size. But, clouds <41 km cover only 5% of the earth. Cloud coverage is dominated by larger clouds with one-half of the coverage coming from clouds >1000 km. GLAS cloud size statistics also show that HIRS possibly overreports some cloud forms by 2%–3%. Looking at groups of GLAS data 21 km long to simulate the HIRS FOV, the authors found that ∼5% are partially filled with cloud. Since HIRS does not account for the part of the FOV without cloud, it will overreport the coverage of these clouds. However, low-altitude and optically thin clouds will not be reported by HIRS if they are so small that they do not affect the upwelling radiation in the HIRS FOV enough to trigger the threshold for cloud detection. These errors are partially offing.
The Double-ITCZ Problem in IPCC AR4 Coupled GCMs: Ocean–Atmosphere Feedback Analysis
Authors: Lin Jia-Lin
Published: October 2007

This study examines the double–intertropical convergence zone (ITCZ) problem in the coupled general circulation models (CGCMs) participating in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4). The twentieth-century climate simulations of 22 IPCC AR4 CGCMs are analyzed, together with the available Atmospheric Model Intercomparison Project (AMIP) runs from 12 of them. To understand the physical mechanisms for the double-ITCZ problem, the main ocean–atmosphere feedbacks, including the zonal sea surface temperature (SST) gradient–trade wind feedback (or Bjerknes feedback), the SST–surface latent heat flux (LHF) feedback, and the SST–surface shortwave flux (SWF) feedback, are studied in detail.

The results show that most of the current state-of-the-art CGCMs have some degree of the double-ITCZ problem, which is characterized by excessive precipitation over much of the Tropics (e.g., Northern Hemisphere ITCZ, South Pacific convergence zone, Maritime Continent, and equatorial Indian Ocean), and are often associated with insufficient precipitation over the equatorial Pacific. The excessive precipitation over much of the Tropics usually causes overly strong trade winds, excessive LHF, and insufficient SWF, leading to significant cold SST bias in much of the tropical oceans. Most of the models also simulate insufficient latitudinal asymmetry in precipitation and SST over the eastern Pacific and Atlantic Oceans.

The AMIP runs also produce excessive precipitation over much of the Tropics, including the equatorial Pacific, which also leads to overly strong trade winds, excessive LHF, and insufficient SWF. This suggests that the excessive tropical precipitation is an intrinsic error of the atmospheric models, and that the insufficient equatorial Pacific precipitation in the coupled runs of many models comes from ocean–atmosphere feedback. Feedback analysis demonstrates that the insufficient equatorial Pacific precipitation in different models is associated with one or more of the following three biases in ocean–atmosphere feedback over the equatorial Pacific: 1) excessive Bjerknes feedback, which is caused by excessive sensitivity of precipitation to SST and overly strong time-mean surface wind speed; 2) overly positive SST–LHF feedback, which is caused by excessive sensitivity of surface air humidity to SST; and 3) insufficient SST–SWF feedback, which is caused by insufficient sensitivity of cloud amount to precipitation. Off the equator over the eastern Pacific stratus region, most of the models produce insufficient stratus–SST feedback associated with insufficient sensitivity of stratus cloud amount to SST, which may contribute to the insufficient latitudinal asymmetry of SST in their coupled runs. These results suggest that the double-ITCZ problem in CGCMs may be alleviated by reducing the excessive tropical precipitation and the above feedback-relevant errors in the atmospheric models.
Effects of Spatial and Temporal Variations in PBL Depth on a GCM
Authors: Shin Sun-Hee , Ha Kyung-Ja
Published: October 2007

The effect of variations in planetary boundary layer (PBL) height on a GCM was investigated using the Yonsei University (YONU) AGCM. This GCM assumes a convective boundary layer constrained to the two lowest model levels. As a consequence of this fixed PBL height, the model tends to produce excessive mixing. In this study the authors focuse on the impact of spatially and temporally varying PBL height. In addition to stability-dependent eddy diffusivity, the model adopts both bulk mixing due to the surface heat flux and z-less mixing under stable conditions. The variable-depth PBL strongly suppressed excessive mixing so that the model bias was reduced over stable regions such as the Antarctic continent. On the other hand, vertical mixing over continents in the summer hemisphere was stronger than for the fixed-PBL version, resulting in greater rising motion and warming effects in the lower atmosphere. The variable-PBL height reduces excess precipitation over the western Pacific and East Asian monsoon region. Based on the improved PBL parameterization, widespread decreases in surface sensible heat flux and rising motion in the lower troposphere occurred simultaneously over the East Asian continent. This implies that the precipitation simulation is very sensitive to PBL processes.
The Transient Atmospheric Circulation Response to North Atlantic SST and Sea Ice Anomalies
Authors: Deser Clara , Tomas Robert A. , Peng Shiling
Published: October 2007

The objective of this study is to investigate the transient evolution of the wintertime atmospheric circulation response to imposed patterns of SST and sea ice extent anomalies in the North Atlantic sector using a large ensemble of experiments with the NCAR Community Climate Model version 3 (CCM3). The initial adjustment of the atmospheric circulation is characterized by an out-of-phase relationship between geopotential height anomalies in the lower and upper troposphere localized to the vicinity of the forcing. This initial baroclinic response reaches a maximum amplitude in ∼5–10 days, and persists for 2–3 weeks. Diagnostic results with a linear primitive equation model indicate that this initial response is forced by diabatic heating anomalies in the lower troposphere associated with surface heat flux anomalies generated by the imposed thermal forcing. Following the initial baroclinic stage of adjustment, the response becomes progressively more barotropic and increases in both spatial extent and magnitude. The equilibrium stage of adjustment is reached in 2–2.5 months, and is characterized by an equivalent barotropic structure that resembles the hemispheric North Atlantic Oscillation–Northern Annular Mode (NAO–NAM) pattern, the model’s leading internal mode of circulation variability over the Northern Hemisphere. The maximum amplitude of the equilibrium response is approximately 2–3 times larger than that of the initial response. The equilibrium response is primarily maintained by nonlinear transient eddy fluxes of vorticity (and, to a lesser extent, heat), with diabatic heating making a limited contribution in the vicinity of the forcing.
Atlantic Subsurface Temperatures: Response to a Shutdown of the Overturning Circulation and Consequences for Its Recovery
Authors: Mignot J. , Ganopolski A. , Levermann A.
Published: October 2007

Using the coupled climate model of intermediate complexity, CLIMBER-3α, changes in the vertical thermal structure associated with a shutdown of the Atlantic meridional overturning circulation (AMOC) are investigated. When North Atlantic Deep Water formation is inhibited by anomalous freshwater forcing, intermediate depth ventilation can remain active and cool the subsurface water masses (i.e., the “cold case”). However, if intermediate ventilation is completely suppressed, relatively warm water coming from the south penetrates to a high northern latitude beneath the halocline and induces a strong vertical temperature inversion between the surface and intermediate depth (i.e., the “warm case”). Both types of temperature anomalies emerge within the first decade after the beginning of the freshwater perturbation. The sign of subsurface temperature anomaly has a strong implication for the recovery of the AMOC once the anomalous freshwater forcing is removed. While the AMOC recovers from the cold case on centennial time scales, the recovery is much more rapid (decadal time scales) when ventilation is completely suppressed and intermediate depths are anomalously warm. This is explained by a more rapid destabilization of the water column after cessation of the anomalous flux due to a strong vertical temperature inversion. A suite of sensitivity experiments with varying strength and duration of the freshwater perturbation and a larger value of background vertical diffusivity demonstrate robustness of the phenomenon. Implications of the simulated subsurface temperature response to the shutdown of the AMOC for future climate and abrupt climate changes of the past are discussed.
The Influence of a Weakening of the Atlantic Meridional Overturning Circulation on ENSO
Authors: Timmermann A. , Okumura Y. , An S.-I. , Clement A. , Dong B. , Guilyardi E. , Hu A. , Jungclaus J. H. , Renold M. , Stocker T. F. , Stouffer R. J. , Sutton R. , Xie S.-P. , Yin J.
Published: October 2007

The influences of a substantial weakening of the Atlantic meridional overturning circulation (AMOC) on the tropical Pacific climate mean state, the annual cycle, and ENSO variability are studied using five different coupled general circulation models (CGCMs). In the CGCMs, a substantial weakening of the AMOC is induced by adding freshwater flux forcing in the northern North Atlantic. In response, the well-known surface temperature dipole in the low-latitude Atlantic is established, which reorganizes the large-scale tropical atmospheric circulation by increasing the northeasterly trade winds. This leads to a southward shift of the intertropical convergence zone (ITCZ) in the tropical Atlantic and also the eastern tropical Pacific. Because of evaporative fluxes, mixing, and changes in Ekman divergence, a meridional temperature anomaly is generated in the northeastern tropical Pacific, which leads to the development of a meridionally symmetric thermal background state. In four out of five CGCMs this leads to a substantial weakening of the annual cycle in the eastern equatorial Pacific and a subsequent intensification of ENSO variability due to nonlinear interactions. In one of the CGCM simulations, an ENSO intensification occurs as a result of a zonal mean thermocline shoaling.

Analysis suggests that the atmospheric circulation changes forced by tropical Atlantic SSTs can easily influence the large-scale atmospheric circulation and hence tropical eastern Pacific climate. Furthermore, it is concluded that the existence of the present-day tropical Pacific cold tongue complex and the annual cycle in the eastern equatorial Pacific are partly controlled by the strength of the AMOC. The results may have important implications for the interpretation of global multidecadal variability and paleo-proxy data.
Dynamical Processes Related to the Appearance of the Okhotsk High during Early Midsummer
Authors: Sato Naoki , Takahashi Masaaki
Published: October 2007

The authors identified an upper-level pressure anomaly pattern corresponding to the interannual variability of the Okhotsk high in midsummer (late July and early August) as a predominant anomaly pattern in the Northern Hemisphere, by using objectively analyzed data. According to the results of empirical orthogonal function (EOF) analyses and composite analyses, a positive pressure anomaly appeared near the tropopause over eastern Siberia in years with strong Okhotsk highs. Examination of the heat budget in the lower troposphere revealed that a negative surface temperature anomaly observed in northern Japan was brought by the advection of the climatological temperature gradient from the anomalous wind associated with the upper-level anticyclonic anomaly. It was also demonstrated that the anomaly field over Siberia does not accompany predominant vorticity forcing or Rossby wave propagation from the west with a specific phase. However, positive kinetic energy conversion from the climatological basic field to the anomaly field is estimated. The energy conversion contributes to maintaining the anomaly pattern. By the numerical experiments using a linear barotropic model, it is suggested that the upper-level anomaly pattern related to the anomalous Okhotsk high appears through the interaction with the climatological basic field, even though the external forcings are homogeneously distributed.
Semipresidentialism and the Perils of Power-Sharing in Neopatrimonial States
Authors: Kirschke Linda
Published: October 2007

The debate about whether “pure presidential” regimes or “pure parliamentary” regimes are better suited to democracy has elicited a substantial scholarly literature. Yet few studies address the impact of semipresidentialism on the prospects for democratic stability. This article posits that executive power-sharing or “cohabitation” under semipresidential systems leads to a high risk of authoritarian reversal in neopatrimonial states. The article develops this theory through an examination of transitions in Niger, the Republic of Congo (Brazzaville), Burundi, Mali, and the Central African Republic (CAR) then tests it on the 18 other semipresidential countries in sub-Saharan Africa.
Navigating Among Worlds
Authors: Goldblatt Hadass , Rosenblum Sara
Published: October 2007

This qualitative study examined the experience of immigrant Jewish Ethiopian youth in Israel and its impact on their identity formation. The study sample comprised 13 high-school students, aged 14 to 17. Data analysis revealed two poles on which these youths negotiate their identity: (1) the temporal pole (past, present, and future), and (2) the youths' struggle to integrate in the new society, presenting family and school environments as two significant domains. To cope with present social and academic challenges and distress, the youths draw strength from their past in Ethiopia, which represents traditional family values, thus projecting to the future their optimistic hopes for familial and economic achievements, as well as the wish to belong to Israeli society.
Internet Safety Gone Wild?
Authors: Tynes Brendesha M.
Published: October 2007

Many Internet safety and parenting experts suggest that parents prohibit their teens from social networking sites and other online spaces where predators may lurk. But we may do adolescents a disservice when we curtail their participation in these spaces, because the educational and psychosocial benefits of this type of communication can far outweigh the potential dangers. These benefits include developing cognitive skills that are consistent with those required in educational settings and perspective-taking skills that are necessary for citizenship in an increasingly multiracial society. Alternative strategies for keeping adolescents safe online should build on the increasing technological awareness and sophistication of teens themselves.
A Child Effects Explanation for the Association Between Family Risk and Involvement in an Antisocial Lifestyle
Authors: Beaver Kevin M. , Wright John Paul
Published: October 2007

Most dominant theories of crime and criminality underscore the saliency of the family in the etiology of offending behaviors. Recently, a small pool of research has suggested that elements of the family, especially parents, do not have a lasting impact on children. This line of inquiry argues that once the effects that the child has on the family are taken into account, the relationship between family factors and child outcomes will be reduced substantially. The authors use data from the Cambridge Study in Delinquent Development to test the reciprocal effects between the family and the child. The results of their structural equation models reveal that global measures of family risk have a very limited effect on adolescent involvement in an antisocial lifestyle. However, adolescent embeddedness in an antisocial lifestyle negatively affects family functioning. The authors speak of the implications of their findings.
The Importance of Friends
Authors: Buote Vanessa M. , Pancer S. Mark , Pratt Michael W. , Adams Gerald , Birnie-Lefcovitch Shelly , Polivy Janet , Wintre Maxine Gallander
Published: October 2007

In a study of new friendships and adjustment among 1st-year university students, students at six Canadian universities completed questionnaires that assessed the quality of new friendships and adjustment during their first academic year. In-depth, face-to-face interviews about students' new friendships were conducted with a subsample of these students. Results indicated a significant positive relation between quality of new friendships and adjustment to university; this association was stronger for students living in residence than for those commuting to university. The interview data provided insight into the processes through which the relation between quality of new friendships and adjustment occurs. Results are discussed in terms of the importance of new friendships in helping individuals to adjust to a new social environment.
The Ethics of Nurse Migration: An Evolution of Community Change
Authors: Milton Constance L.
Published: October 2007

International nursing migration, or the movement of people across international boundaries, has enormous implications for the discipline of nursing. This column focuses on ethical assumptions and possible implications for community change as individual or group. Discussion follows with the illumination of community change paradoxes, implications for policy development, nursing education, and nursing practice from the nursing theoretical perspective of the humanbecoming school of thought.
Nursing, Healthcare, and Culture: A View of the Year 2050 From Botswana and Israel
Authors: Fawcett Jacqueline , Sabone Motshedisi B. , Ganz Freda DeKeyser
Published: October 2007

This column presents a dialogue with nurse scholars Motshedisi B. Sabone from Botswana and Freda DeKeyser Ganz from Israel, who share their respective visions and understanding of each country's vision of nursing, healthcare, and quality of life in the year 2050.
Recovering From Abuse: A Comparison of Three Paths
Authors: Baumann Steven L.
Published: October 2007

Nursing, and other health professions, have for many years been generally well-educated to be on the alert for, identify, and report abuse, particularly of children. What many nurses are less prepared for, and less comfortable with, is how to help adult patients who were victims of abuse in the past, and who still suffer from its consequences. The purpose of this article is to compare and contrast three different pathways to recovery for persons living with the legacy of abuse and victimization. The three paths are the traditional psychiatric model, spiritually-based self-help, and the humanbecoming theory.
Living as an Oldest Old in Rio de Janeiro: The Lived Experience Told
Authors: Caldas Célia P. , Berterö Carina M.
Published: October 2007

This phenomenological-hermeneutic study was an inquiry into the lived experience of 16 very old persons who were living in their own homes. The nursing perspective was Gadow's existential advocacy for nursing practice. The study findings led to the essence of the phenomenon: pragmatic transition to old age, within a restricted future. Heideggerian concepts were applied and the findings were discussed in relation to the guiding theoretical perspective and related literature. Understanding the meaning of being a very old person is fundamental to developing nursing interventions to help people remain independent, with a sense of self-determination, for as long as possible.
Using Case Studies Based on a Nursing Conceptual Model to Teach Medical-Surgical Nursing
Authors: DeSanto-Madeya Susan
Published: October 2007

Nurse educators are continually challenged to develop teaching strategies that enhance students' critical thinking, problem-solving, and decision-making skills. Case studies are a creative learning strategy that fosters these skills through the use of in-depth descriptions of realistic clinical situations. Conceptual models of nursing provide a unique body of knowledge that can be used to guide construction of case studies and enhance application of didactic course content to nursing practice. In this column, the author discusses the use of case studies constructed within the context of the Roy adaptation model for a senior level medical-surgical nursing course.
Nursing in Israel
Authors: Ehrenfeld Mally , Itzhaki Michal , Baumann Steven L.
Published: October 2007

Nurses in Israel struggle with many of the same problems faced by nurses in other parts of the world, such as increased use of technology, overwhelming amounts of information, and demands for high quality of services to larger numbers of people within tighter budgets. In addition to the aging of the general population, the country has welcomed large numbers of immigrants. The nation's expenditures for healthcare and nursing education have, at times, had to take a back seat to the government's efforts to house new immigrants, to relocate groups, and to defend the nation against politically motivated violence and attacks. All of this is in the context of regional conflicts and international debates.
American Academy of Nursing Expert Panel on Global Nursing and Health: White Paper on Global Nursing and Health
Authors: Rosenkoetter Marlene M. , Nardi Deena A.
Published: October 2007

The American Academy of Nursing's (AAN) Expert Panel on Global Health's white paper examines critical issues in the international nursing arena, including the global shortage of nurses, legal and ethical issues in recruiting international students for nursing positions in developed countries, the nurse faculty shortage, faculty and student exchanges, effects of the U.S. Citizenship and Immigration Services law, and laws governing nursing practice within the public domain. Realistic models directed toward viable solutions to these issues are critically needed. It offers 13 recommendations to address issues from a global perspective, including hosting a conference on global nursing, health research, and faculty exchanges; annual meetings; and an international conference of world nurse leaders, the AAN, and Global Panel representatives to discuss this white paper and plan follow-up actions. The final white paper was approved by the AAN in 2005 and is published here to stimulate discussion regarding current and future initiatives.
Gender Differences in Chinese Immigrants: Predictors for Antihypertensive Medication Adherence
Authors: Li Wen-Wen , Froelicher Erika S.
Published: October 2007

The purpose of this study was to describe gender differences in predictors for antihypertensive medication adherence in Chinese immigrants. A cross-sectional design was used with recruitment with a convenience sample of 100 men and 100 women with hypertension. Measurements for demographics, cultural factors, clinical factors, and medication adherence were self-administered by the participants. Blood pressure was checked twice. A multivariate logistic regression was used to establish a parsimonious prediction model for medication adherence. It was found that in men, longer length of stay in the United States was a predictor for nonadherence. The predictor of nonadherence in women was lower perceived benefits of antihypertensive medications. To increase adherence in women, the benefits of antihypertensive medications should be emphasized. For men who have lived in the United States for 12 years or more, their adherence should be closely monitored.
Participatory Action Research (PAR): An Approach for Improving Black Women's Health in Rural and Remote Communities
Authors: Etowa Josephine B. , Bernard Wanda Thomas , Oyinsan Bunmi , Clow Barbara
Published: October 2007

Women are among the most disadvantaged members of any community, and they tend to be at greatest risk of illness. Black women are particularly vulnerable and more prone than White women to illnesses associated with social and economic deprivation, including heart disease and diabetes. They utilize preventive health services less often, and when they fall ill, the health of their families and communities typically suffers as well. This article discusses the process of doing innovative participatory action research (PAR) in southwest Nova Scotia Black communities. The effort resulted in the generation of a database, community action, and interdisciplinary analysis of the intersecting inequities that compromise the health and health care of African Canadian women, their families, and their communities. This particular research effort serves as a case study for explicating the key tenets of PAR and the barriers to and contradictions in implementing PAR in a community-academic collaborative research project.
Finding Information on Immigrant and Refugee Health
Authors: Carlock Danielle M.
Published: October 2007

Health care providers working with immigrant and refugee populations need to find and access information related to patient care and to direct patients to culturally and linguistically appropriate health information. This article shows how to find this type of information using online databases, library catalogs, and the Internet. Special emphasis is placed on conducting subject searches in online databases such as PubMed and the Cumulative Index to Nursing and Allied Health Literature. Also provided is an appendix listing Web sites on immigrant and refugee health.
Addressing Childhood Overweight: Strategies Learned From One Latino Community
Authors: Snethen Julia A. , Hewitt Jeanne Beauchamp , Petering David H.
Published: October 2007

The purpose of this study is to understand one Latino community's perspectives about childhood overweight within this high-risk ethnic group. Three focus groups, consisting of 12 mothers, 12 fathers, and 8 boys and 4 girls ages 10-12, participated. Transcripts of interviews were coded using N-VIVO and analyzed thematically. Several themes emerge: parents' demanding work schedules, lack of time, transportation issues, opportunities for physical activities, and lack of meal preparation. Participants knew good nutrition and exercise help prevent obesity. Nursing interventions must address multiple challenges with childhood obesity at the family and community levels.
Soluble P-Selectin During a Single Hemodialysis Session in Patients With Chronic Renal Failure and Erythropoietin Treatment
Authors: Staško Ján , Galajda Peter , Ivanková Jela , Hollý Pavol , Rozborilová Eva , Kubisz Peter
Published: October 2007

In several studies, hemodialysis (HD) patients treated with recombinant human erythropoietin (rHuEPO) because of renal anemia showed increased levels of soluble adhesion molecules. The purpose of the study was to investigate the changes of soluble P-selectin (sSELP) and its relationship to platelet activation during a single HD session in patients with long-term rHuEPO treatment. Fifty-two HD patients with chronic renal failure were involved—26 with rHuEPO treatment (EPO group) and 26 without (non-EPO group). Thirty healthy subjects served as the control group. The sSELP, β-thromboglobulin, and platelet factor 4 plasma levels were measured before and after a single 4-hour HD session on a cuprophane dialyzer. The basal β-thromboglobulin and platelet factor 4 plasma levels were significantly increased in both HD groups compared with healthy controls but did not change after a single HD session, except for a significant decrease of platelet factor 4 in the non-EPO group. The predialysis sSELP plasma levels did not differ significantly compared with those of the healthy controls, but there was a significant increase of sSELP levels after a single HD session in both groups (EPO, P < .005; non-EPO, P < .05, respectively). These results suppose that the increased sSELP level was released from platelets during the course of a single HD session. The more significant increase of the sSELP plasma levels in EPO group during HD indicates that platelets are more activated in patients with long-term rHuEPO treatment, and this fact could partially explain the suspected tendency for thrombosis in these patients.
Hypercoagulable State in Five Thalassemia Intermedia Patients
Authors: Bhattacharyya Maitreyee , Kannan Meganathan , Chaudhry Ved P. , Mahapatra M. , Pati H. , Saxena Renu
Published: October 2007

Fifty-three patients of thalassemia intermedia and 40 controls were studied for clinical evidence of thrombosis and laboratory evidence of hypercoagulable state. Thrombotic episodes were detected in 5 (9.4%) patients. Two of these 5 patients with thrombosis were splenectomized. Laboratory evaluation showed presence of thrombocytosis in 8 (15%), 5 of these were splenectomized. Platelet hyperaggregation was detected in 12 (22.2%) patients. Although rate of aggregation was slow in 7 (13.2%) patients, degree of aggregation was normal in these 7 patients and platelet hypoaggregation was not detected in any patient. Level of coagulation inhibitors protein C and protein S, and antithrombin III were decreased in 31 (58.4%) patients. There was no correlation between low level of protein C and protein S with hepatic dysfunction and iron overload. Antithrombin III level was decreased only in 8 (15%) patients. There was a statistically significant association between the lower level of this inhibitor and hepatic dysfunction. In conclusion, this study provides evidence for the existence of a chronic hypercoagulable state in patients with β thalassemia intermedia, and suggests that expression of a procoagulant surface by thalassemia intermedia red blood cells may be the major underlying factor giving rise to platelet and coagulation inhibitor abnormalities in these patients. These alterations are not related to iron overload or hepatic dysfunction.
Influence of Radiofrequency Catheter Ablation on Platelet Aggregation
Authors: Kozlovaite Vilma , Grybauskas Pranas , Cimbolaityte Jurate , Mongirdiene Ausra , Puodziukynas Aras , Kazakevicius Tomas , Ptasekas Julius
Published: October 2007

the objective of this article was to find out how radiofrequency catheter ablation (RFA) influences platelet aggregation (PA), and the dependence on the total energy (TE) of RFA used and the cause of arrhythmia. We investigated 97 patients. PA was analyzed before, after, and in 24 hours after RFA. ADP- and epinephrine-induced PA significantly decreased after RFA by 5% and 8.9% ( P < .001), respectively, and increased in 24 hours close to baseline. PA induced by ADP and collagen did not radically depend on the TE. Epinephrine-induced PA decreased after RFA by 0%, 8% ( P < .05), and 16.9% ( P < .01) in groups of patients where the TEs used were <4000 J, 4000 to 15 000 J, and >15 000 J, respectively. There were no significant differences in PA between groups based on the cause of arrhythmia. ADP- and epinephrine-induced PA significantly decreased after RFA and returned close to baseline in 24 hours. Epinephrine-induced PA was inversely associated with the TE used for RFA.
Type IIB von Willebrand Disease: Role of Qualitative Defects in Atherosclerosis and Endothelial Dysfunction
Authors: Bilora Franca , Zanon Ezio , Casonato Alessandra , Bertomoro Antonella , Petrobelli Francesco , Cavraro Monica , Campagnolo Enrico , Girolami Antonio
Published: October 2007

Objective. To verify whether a hereditary bleeding tendency, such as von Willebrand disease (vWD) type IIB, protects against the onset of atherosclerosis. Participants and Methods. Twenty-four patients with vWD type IIB and 24 healthy controls, matched for common atherosclerotic risk factors. All patients were evaluated by color Doppler ultrasound of the common carotid, carotid bifurcation, common femoral artery, brachial artery, and abdominal aorta, investigating intima-media thickness (IMT) and presence of plaques in each arterial district. Flow mediated dilation (FMD) of the brachial artery was used to test endothelial function. Results. vWD type IIB patients presented no significant difference in IMT in any arterial district. FMD showed no differences between the 2 groups. Conclusions. The quantitative clotting defect characteristic of vWD type IIB does not seem to protect against atherosclerosis.
Argatroban Therapy for Heparin-Induced Thrombocytopenia in Acutely Ill Patients
Authors: Gray Anthony , Wallis Diane E. , Hursting Marcie J. , Katz Eliezer , Lewis Bruce E.
Published: October 2007

Heparin-induced thrombocytopenia (HIT) is a prothrombotic, immune-mediated adverse reaction to heparin therapy. To evaluate clinical outcomes and effects of argatroban therapy in acutely ill HIT patients. Retrospective analysis. Hospital in-patient. Acutely ill patients with clinically diagnosed HIT from previous multicenter, historically controlled studies of argatroban therapy in HIT. Argatroban, adjusted to maintain activated partial thromboplastin times 1.5 to 3 times baseline, or historical control therapy (ie, no direct thrombin inhibition). We identified 488 patients who received argatroban (N = 390; mean dose of 1.9 µg/kg/min for a mean 6 days) or historical control therapy (N = 98) for HIT. The primary all-cause composite endpoint of death, amputation, or new thrombosis within 37 days occurred in 133 (34.1%) argatroban-treated patients and 38 (38.8%) controls ( P = .41). Argatroban, versus control, significantly reduced the primary thrombosis-related composite endpoint of death because of thrombosis, amputation secondary to ischemic complications of HIT, or new thrombosis (17.7% vs 30.6%, P = .007). Significant reductions also occurred in new thrombosis and death because of thrombosis. Major bleeding was similar between groups (7.7% vs 8.2%; P = .84). Adverse outcomes were more likely to occur in patients who were initially diagnosed with HIT and thrombosis, had undergone cardiac surgery, were not white, or had more severe thrombocytopenia. In acutely ill HIT patients, argatroban, versus historical control, provides effective antithrombotic therapy without increasing major bleeding. Patients with more severe thrombocytopenia or HIT-related thrombosis on HIT diagnosis have a poorer prognosis, emphasizing the importance of prompt recognition/ treatment of HIT in acutely ill patients.
Psychosocial Influences on Suboptimal Adjuvant Breast Cancer Treatment Adherence Among African American Women: Implications for Education and Intervention
Authors: Magai Carol , Consedine Nathan S. , Adjei Brenda A. , Hershman Dawn , Neugut Alfred
Published: October 2007

Despite lower incidence, African American women are at increased risk of dying from breast cancer relative to their European American counterparts. Although there are key differences in both screening behavior and tumor characteristics, an additional part of this mortality difference may lie in the fact that African American women receive suboptimal adjuvant chemotherapy and may receive suboptimal hormonal therapy, therapies that are known to increase survival. The authors consider ethnic differences in the psychosocial factors that have been shown to relate to poor screening adherence and consider how they may influence adherence to breast cancer adjuvant treatment, thus the receipt of suboptimal adjuvant chemo or hormonal therapy. To this end, they review ethnic differences in cognitive, emotional, and social network variables. Psychosocial variables should be included in research designed to understand cancer disparities as well interventions that can be tailored to culturally diverse populations to improve treatment adherence.
The Columbine Victims and the Myth of the Juvenile Superpredator
Authors: Muschert Glenn W.
Published: October 2007

This study examines the news media coverage of the 1999 Columbine school shootings, as a component of a noted crime myth of the juvenile superpredator. Thematic content analysis was conducted on 683 articles selected from print and broadcast media, revealing four themes of coverage, including the identification and description of the victims, details of victims' deaths, coverage of memorial services, and other special social issues such as race, religion, and gun control. Chronological analysis of article distribution revealed four spikes in volume of coverage, which is associated with media reframing of the victims coverage to maintain the salience of the story. The Columbine victim coverage reaffirms the crime myth of the juvenile superpredator and reifies the punitive juvenile justice solutions suggested in alarmist responses to erroneous fears about growing rates and severity of youth violence. The impact of the superpredator myth on public discourse about Columbine and similar cases is explored.
Emotional and Behavioral Problems of 13-to-18-Year-Old Incarcerated Female First-Time Offenders and Recidivists
Authors: Tille James Eugene , Rose John Creighton
Published: October 2007

This exploratory study in Pierce County, Washington, compared emotional and behavioral problems of 13- to 18-year-old incarcerated female first-time offenders ( n = 38) and recidivists ( n = 78) using the Massachusetts Youth Screening Inventory, Version Two (MAYSI-2) and demographic data. The study found that adolescent female recidivists had more emotional and behavioral problems, more unstable lifestyles, and less stable family situations.
Two-stage formation of kaolinite in shear-zone slates, southern Iberian Massif, SE Spain
Authors: Jiménez-Millán J. , Velilla N. , Vázquez M.
Published: October 2007

Kaolinite aggregates are the major alteration product in the strongly deformed areas of a shear zone developed in contact-metamorphosed slates from the Southern Iberian Massif near Jaén (SE Spain). Muscovite and Fe-rich chlorite in strain shadows of broken andalusite crystals were observed in slates from less deformed areas. The presence of phyllosilicate packets nearly perpendicular to each other and veinlets parallel to {110} of andalusite reveal the importance of cleavage-controlled fracturing of andalusite to the mineral reactions. The compositional similarity between kaolinite and andalusite suggests a direct transformation of andalusite to kaolinite in the strongly altered area. The absence of clear preferred orientation of phyllosilicates relative to andalusite, and the compositional differences of andalusite with muscovite and chlorite from the less altered samples, indicate andalusite dissolution and chlorite-muscovite precipitation during a first mineral-growth stage. Muscovite-kaolinite and chlorite-kaolinite intergrowths indicate a later retrograde replacement stage.