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PubMedDate not supplied

Simulating the effects of climatic variation on stem carbon accumulation of a ponderosa pine stand: comparison with annual growth increment data.

Simulation models of ecosystem processes may be necessary to separate the long-term effects of climate change on forest productivity from the effects of year-to-year variations in climate. The objective of this study was to compare simulated annual stem growth with measured annual stem growth from 1930 to 1982 for a uniform stand of ponderosa pine (Pinus ponderosa Dougl.) in Montana, USA. The model, FOREST-BGC, was used to simulate growth assuming leaf area index (LAI) was either constant or increasing. The measured stem annual growth increased exponentially over time; the differences between the simulated and measured stem carbon accumulations were not large. Growth trends were removed from both the measured and simulated annual increments of stem carbon to enhance the year-to-year variations in growth resulting from climate. The detrended increments from the increasing LAI simulation fit the detrended increments of the stand data over time with an R(2) of 0.47; the R(2) increased to 0.65 when the previous year's simulated detrended increment was included with the current year's simulated increment to account for autocorrelation. Stepwise multiple linear regression of the detrended increments of the stand data versus monthly meteorological variables had an R(2) of 0.37, and the R(2) increased to 0.47 when the previous year's meteorological data were included to account for autocorrelation. Thus, FOREST-BGC was more sensitive to the effects of year-to-year climate variation on annual stem growth than were multiple linear regression models.

Journal Article↗
PubMed2000

Results of a gender-climate and work-environment survey at a midwestern academic health center.

UNLABELLED: AND CLIMATE determine how faculty's perceptions of medical school gender climate differ by gender, track, rank, and departmental affiliation. METHOD: In 1997, a 115-item questionnaire was sent to all University of Wisconsin Medical School faculty to assess their perceptions of mentoring, networking, professional environment, obstacles to a successful academic career, and reasons for considering leaving academic medicine. Using Fisher's exact two-tailed test, the authors assessed gender differences both overall and by track, rank, and departmental cluster. RESULTS: Of the 836 faculty on tenure, clinician-educator, and clinical tracks, 507 (61%) responded. Although equal proportions of men and women had mentors, 24% of the women (compared with 6% of men; p < .001) felt that informal networking excluded faculty based on gender. Women's and men's perceptions differed significantly (p < .001) on 12 of 16 professional environment items (p < .05 on two of these items) and on five of six items regarding obstacles to academic success. While similar percentages of women and men indicated having seriously considered leaving academic medicine, their reasons differed: women cited work-family conflicts (51%), while men cited uncompetitive salaries (59%). These gender differences generally persisted across tracks, ranks, and departmental clusters. The greatest gender differences occurred among clinician-educators, associate professors, and primary care faculty. CONCLUSIONS: Women faculty perceived that gender climate created specific, serious obstacles to their professional development. Many of those obstacles (e.g., inconvenient meeting times and lack of child care) are remediable. These data suggest that medical schools can improve the climate and retain and promote women by more inclusive networking, attention to meeting times and child care, and improved professional interactions between men and women faculty.

Career Mobility↗
PubMed2004

Assessing the relationship of learning approaches to workplace climate in clerkship and residency.

PURPOSE: To determine what approaches to learning are adopted by clinical clerks and residents and whether these approaches are associated with demographic factors, specialty, level of training, and perceptions of the workplace climate. METHOD: In 2001-02, medical clerks (n = 532) and residents (n = 2,939) at five medical schools in Ontario, Canada, were mailed the Workplace Learning Questionnaire. The correlation between the approaches to learning at work and perceived workplace climate and the influence of gender, age, location, residency program and level of training on outcomes were measured. RESULTS: A total of 1,642 clerks and residents responded (47%). The factor structure and reliability of the Workplace Learning Questionnaire were confirmed for these respondents. A surface-disorganized approach to learning was correlated with perception of heavy workload (r = .401, p < .001). The deep approach to learning was correlated with perception of choice-independence in the workplace and a supportive-receptive workplace (r = .32, p < .001; r = .23, p < .001). The climate factors, perception of choice-independence and supportive-receptive workplace, were correlated (r = .60, p < .001). There were significant differences among the mean scores for scales based on residency, year of training, and location of training. CONCLUSIONS: Perception of the workplace climate was associated with the approach to learning in the workplace of clerks and residents. Perception of heavy workload was associated with less effective approaches to learning. These associations varied with the residency program and the level of training.

Adult↗
PubMedDate not supplied

Enhancing work climate to improve performance and retain valued employees.

Organizational climate is the perception of how it "feels" to work in a particular work environment. Climate is one of the most powerful, yet overlooked, factors when determining the performance of a particular organization or work team. Studies have consistently linked climate to individual and organizational performance. The author discusses the 6 key dimensions of climate, how to evaluate it in an organization, and methods to enhance it.

Efficiency, Organizational↗
PubMedDate not supplied

Ethical climate in managed care organizations.

Managed care organizations employ nurses as medical utilization reviewers; however, little is known about the ethical climate of these organizations. This study describes different ethical climates in which utilization review nurses work and the implications of these differences for nurse administrators. The nurse participants, although demographically similar across three managed care organizations, perceived distinct ethical climates across the organizations. Nurses were employed to make complex decisions regarding medical care utilization; however, none of the organizations had an ethics committee to help nurse reviewers in this decision-making process. The need for such committees, as well as clarification of a consistent and deliberate ethical climate by nurse administrators, is discussed.

Adult↗
PubMed2006

Organizational climate and intensive care unit nurses' intention to leave.

OBJECTIVE: The purposes of this study were to a) estimate the incidence of intensive care units nurses' intention to leave due to working conditions; and b) identify factors predicting this phenomenon. DESIGN: Cross-sectional design. SETTING: Hospitals and critical care units. SUBJECTS: Registered nurses (RNs) employed in adult intensive care units. INTERVENTIONS: Organizational climate, nurse demographics, intention to leave, and reason for intending to leave were collected using a self-report survey. MEASUREMENTS AND MAIN RESULTS: Nurses were categorized into two groups: a) those intending to leave due to working conditions; and b) others (e.g., those not leaving or retirees). The measure of organizational climate had seven subscales: professional practice, staffing/resource adequacy, nurse management, nursing process, nurse/physician collaboration, nurse competence, and positive scheduling climate. Setting characteristics came from American Hospital Association data and a survey of chief nursing officers. RESULTS: A total of 2,323 RNs from 66 hospitals and 110 critical care units were surveyed across the nation. On average, the RN was 39.5 yrs old (SD = 9.40), had 15.6 yrs (SD = 9.20) experience in health care, and had worked in his or her current position for 8.0 yrs (SD = 7.50). Seventeen percent (n = 391) of the respondents indicated intending to leave their position in the coming year. Of those, 52% (n = 202) reported that the reason was due to working conditions. Organizational climate factors that had an independent effect on intensive care unit nurse intention to leave due to working conditions were professional practice, nurse competence, and tenure (p < .05). CONCLUSIONS: Improving professional practice in the work environment and clinical competence of the nurses as well as supporting new hires may reduce turnover and help ensure a stable and qualified workforce.

Adult↗
PubMedDate not supplied

Effect of high climate temperature on the behavioral and psychological symptoms of dementia.

OBJECTIVE: The objective of this study was to investigate if high climate temperature could have a negative effect on behavioral and psychological symptoms of dementia (BPSD). DESIGN: We conducted a retrospective study. SETTING AND PATIENTS: Six patients discharged from the "Richiedei" Alzheimer Rehabilitation Unit-Italy during a period of very high climate temperature (June 14-21, 2002, 30.4 degrees C [86.7 degrees F]) are defined as the case-group. Sociodemographic, clinical, and therapeutic characteristics are compared with those of patients discharged during the previous 5 weeks (I control-group, n = 10) and the following 5 weeks (II control-group, n = 9). METHODS: On admission and on discharge, a multidimensional evaluation was performed assessing mental and functional status, BPSD (Neuropsychiatric Inventory, NPI), somatic health status, and pharmacotherapy. Changes in BPSD severity was computed as the difference in NPI total score (Delta-NPI) between the last and the first week of stay. Atmospheric temperature was also considered. RESULTS: The three groups did not differ with respect to sociodemographic, clinical, and therapeutic characteristics. On admission, frequency and severity of BPSD were similar among groups; whereas on discharge, the case-group had an increase in NPI scores (NPI during the first week [median], 13 in the case-group vs. 21 in the I control-group vs. 20.5 in the II one; during the last week: 24.5 vs. 9.5 vs. 15, respectively). CONCLUSION: High climate temperature could have a negative impact on behavior in demented patients. To explain the possible mechanisms of the negative impact of high climate temperature on behavior, two hypotheses are proposed.

Aged↗
PubMed2005

Climate change causing phase transitions of walleye pollock (Theragra chalcogramma) recruitment dynamics.

In 1976 the North Pacific climate shifted, resulting in an average increase of the water temperature. In the Gulf of Alaska the climate shift was followed (i.e. early 1980s) by a gradual but dramatic increase in the abundance of groundfish species that typically prey on pre-recruitment stages of walleye pollock. In the present study we used a previously parameterized model to investigate the effect of these climate and biological changes on the recruitment dynamics of walleye pollock in the Gulf of Alaska. Simulations covered the 1970-2000 time frame and emphasized the medium-to-long temporal scale (i.e. about 5-10 years) of environmental variability. Results showed that during periods characterized by high sea surface temperature and high predation on juvenile pollock stages, recruitment variability and magnitude were below average, and recruitment control was delayed to stages older than the 0-group. Opposite dynamics (i.e. high abundance and variability, and early recruitment control) occurred during periods characterized by low temperature and predation. These results are in general agreement with empirical observations, and allowed us to formulate causal explanations for their occurrence. We interpreted the delay of recruitment control and the reduction of variability as an effect of increased constraint on the abundance of post age-0 stages, in turn imposed by high density dependence and predation mortality. On the other hand, low density-dependence and predation favoured post age-0 survival, and allowed for an unconstrained link between larval and recruitment abundance. Our findings demonstrate that the dominant mechanisms of pollock survival change over contrasting climate regimes. Such changes may in turn cause a phase transition of recruitment dynamics with profound implications for the management of the entire stock.

Animals↗
PubMed2007

Climate change and outbreaks of amphibian chytridiomycosis in a montane area of Central Spain; is there a link?

Amphibian species are declining at an alarming rate on a global scale in large part owing to an infectious disease caused by the chytridiomycete fungus, Batrachochytrium dendrobatidis. This disease of amphibians has recently emerged within Europe, but knowledge of its effects on amphibian assemblages remains poor. Importantly, little is known about the environmental envelope that is associated with chytridiomycosis in Europe and the potential for climate change to drive future disease dynamics. Here, we use long-term observations on amphibian population dynamics in the Peñalara Natural Park, Spain, to investigate the link between climate change and chytridiomycosis. Our analysis shows a significant association between change in local climatic variables and the occurrence of chytridiomycosis within this region. Specifically, we show that rising temperature is linked to the occurrence of chytrid-related disease, consistent with the chytrid-thermal-optimum hypothesis. We show that these local variables are driven by general circulation patterns, principally the North Atlantic Oscillation. Given that B. dendrobatidis is known to be broadly distributed across Europe, there is now an urgent need to assess the generality of our finding and determine whether climate-driven epidemics may be expected to impact on amphibian species across the wider region.

Amphibians↗
PubMed2006

Climate change, species-area curves and the extinction crisis.

An article published in the journal Nature in January 2004-in which an international team of biologists predicted that climate change would, by 2050, doom 15-37% of the earth's species to extinction-attracted unprecedented, worldwide media attention. The predictions conflict with the conventional wisdom that habitat change and modification are the most important causes of current and future extinctions. The new extinction projections come from applying a well-known ecological pattern, the species-area relationship (SAR), to data on the current distributions and climatic requirements of 1103 species. Here, I examine the scientific basis to the claims made in the Nature article. I first highlight the potential and pitfalls of using the SAR to predict extinctions in general. I then consider the additional complications that arise when applying SAR methods specifically to climate change. I assess the extent to which these issues call into question predictions of extinctions from climate change relative to other human impacts, and highlight a danger that conservation resources will be directed away from attempts to slow and mitigate the continuing effects of habitat destruction and degradation, particularly in the tropics. I suggest that the most useful contributions of ecologists over the coming decades will be in partitioning likely extinctions among interacting causes and identifying the practical means to slow the rate of species loss.

Animals↗
PubMed2002

Emotion at work: identifying the emotional climate of night nursing.

This paper introduces the concept of the emotional climate of the workplace and explores how it both shapes and is shaped by the emotions experienced, expressed and redefined by nurses. It extracts emotional aspects of an organizational climate framework developed by Litwin and Stringer and examines these with respect to nurse's experiences. The primary research was carried out at a general hospital NHS Trust in the East Midlands of the UK using a grounded theory methodology. The research methods included semi-structured interviews and observation. The themes identified include many of those found by Litwin and Stringer, others which represent variations upon these, and a new set, which, when combined, identify the emotional climate of the organization. The findings have confirmed that the "experiment" of using a 33-year-old positivistic framework to investigate aspects of qualitative research has enabled a robust contribution to the conceptual area of emotional climate.

Attitude of Health Personnel↗
PubMed2000

Equity, efficiency, uncertainty, and the mitigation of global climate change.

Policies to mitigate potential damages from global climate change impose costs on the current generation to provide benefits to future generations. This article examines how comparisons among three stylized policies-business-as-usual, mitigation of climate change, and compensation for climate damages-depend on social preferences with respect to risk and intertemporal equity. Also examined is the opportunity-cost criterion, which asserts that mitigation should not be chosen if its net present value is smaller than that of business-as-usual. Analysis reveals that the discount factor used to evaluate whether mitigation satisfies this criterion depends on preferences regarding risk and intertemporal inequality of consumption, and on the risk of the compensation policy. Risk aversion favors mitigation over business-as-usual. If society is neutral to inequality, risk aversion disfavors compensation, but if society is inequality averse, the effect of risk aversion on preferences between compensation and business-as-usual is ambiguous. Inequality aversion tends to favor business-as-usual over both alternative policies provided that, roughly speaking, the anticipated future improvements in welfare exceed the anticipated climate damages.

Journal Article↗
PubMed2004

Risk and climate change: perceptions of key policy actors in Canada.

This article examines factors that predict perceptions of risk associated with global climate change. The research focuses on the perceptions of those associated with climate change policy making in the prairie region of Canada. The data are from an online survey (n=851) of those policy actors. The analysis integrates several dominant approaches to the study of risk perception: psychometric approaches that examine the effects of cognitive structure; demographic assessments that examine, for example, differences in perception based on gender or family status; and political approaches that suggest that one's position in the policy process may affect his or her perceived risk. Attitudes toward climate change are to a degree predicted by all of these factors, but only when indirect effects are observed. Sociodemographic characteristics have little direct effect on perceived risk, but do affect general beliefs that affect risk perceptions. Perceived risk is related more strongly to these general beliefs or world views than to more specific beliefs about the effects of climate change on weather patterns. Position within the policy process also contributes to our understanding of perceptions, with industry and governmental actors demonstrating similar attitudes, which contrast with environmental groups and university researchers.

Journal Article↗
PubMed2005

The role of cultural diversity climate in recruitment, promotion, and retention of faculty in academic medicine.

BACKGROUND: Ethnic diversity among physicians may be linked to improved access and quality of care for minorities. Academic medical institutions are challenged to increase representation of ethnic minorities among health professionals. OBJECTIVES: To explore the perceptions of physician faculty regarding the following: (1) the institution's cultural diversity climate and (2) facilitators and barriers to success and professional satisfaction in academic medicine within this context. DESIGN: Qualitative study using focus groups and semi-structured interviews. PARTICIPANTS: Nontenured physicians in the tenure track at the Johns Hopkins University School of Medicine. APPROACH: Focus groups and interviews were audio-taped, transcribed verbatim, and reviewed for thematic content in a 3-stage independent review/adjudication process. RESULTS: Study participants included 29 faculty representing 9 clinical departments, 4 career tracks, and 4 ethnic groups. In defining cultural diversity, faculty noted visible (race/ethnicity, foreign-born status, gender) and invisible (religion, sexual orientation) dimensions. They believe visible dimensions provoke bias and cumulative advantages or disadvantages in the workplace. Minority and foreign-born faculty report ethnicity-based disparities in recruitment and subtle manifestations of bias in the promotion process. Minority and majority faculty agree that ethnic differences in prior educational opportunities lead to disparities in exposure to career options, and qualifications for and subsequent recruitment to training programs and faculty positions. Minority faculty also describe structural barriers (poor retention efforts, lack of mentorship) that hinder their success and professional satisfaction after recruitment. To effectively manage the diversity climate, our faculty recommended 4 strategies for improving the psychological climate and structural diversity of the institution. CONCLUSIONS: Soliciting input from faculty provides tangible ideas regarding interventions to improve an institution's diversity climate.

Academic Medical Centers↗
PubMed1996

Uncertainties in the link between global climate change and predicted health risks from pollution: hexachlorobenzene (HCB) case study using a fugacity model.

Industrial societies have altered the earth's environment in ways that could have important, longterm ecological, economic, and health implications. In this paper, we examine the extent to which uncertainty about global climate change could impact the precision of predictions of secondary outcomes such as health impacts of pollution. Using a model that links global climate change with predictions of chemical exposure and human health risk in the Western region of the United States of America (U.S.), we define parameter variabilities and uncertainties and we characterize the resulting outcome variance. As a case study, we consider the public health consequences from releases of hexachlorobenzene (HCB), a ubiquitous multimedia pollutant. By constructing a matrix that links global environmental change both directly and indirectly to potential human-health effects attributable to HCB released into air, soil, and water, we define critical parameter variances in the health risk estimation process. We employ a combined uncertainty/sensitivity analysis to investigate how HCB releases are affected by increasing atmospheric temperature and the accompanying climate alterations that are anticipated. We examine how such uncertainty impacts both the expected magnitude and calculational precision of potential human exposures and health effects. This assessment reveals that uncertain temperature increases of up to 5 degrees C have little impact on either the magnitude or precision of the public-health consequences estimated under existing climate variations for HCB released into air and water in the Western region of the U.S.

Biometry↗
PubMed2005

The 2003 heat wave in France: dangerous climate change here and now.

In an analysis of the French episode of heat wave in 2003, this article highlights how heat wave dangers result from the intricate association of natural and social factors. Unusually high temperatures, as well as socioeconomic vulnerability, along with social attenuation of hazards, in a general context where the anthropogenic contribution to climate change is becoming more plausible, led to an excess of 14,947 deaths in France, between August 4 and 18, 2003. The greatest increase in mortality was due to causes directly attributable to heat: dehydration, hyperthermia, heat stroke. In addition to age and gender, combinatorial factors included preexisting disease, medication, urban residence, isolation, poverty, and, probably, air pollution. Although diversely impacted or reported, many parts of Europe suffered human and other losses, such as farming and forestry through drought and fires. Summer 2003 was the hottest in Europe since 1500, very likely due in part to anthropogenic climate change. The French experience confirms research establishing that heat waves are a major mortal risk, number one among so-called natural hazards in postindustrial societies. Yet France had no policy in place, as if dangerous climate were restricted to a distant or uncertain future of climate change, or to preindustrial countries. We analyze the heat wave's profile as a strongly attenuated risk in the French context, as well as the causes and the effects of its sudden shift into amplification. Research and preparedness needs are highlighted.

Europe↗
PubMed2005

Consortium for Atlantic Regional Assessment: information tools for community adaptation to changes in climate or land use.

To inform local and regional decisions about protecting short-term and long-term quality of life, the Consortium for Atlantic Regional Assessment (CARA) provides data and tools (for the northeastern United States) that can help decision makers understand how outcomes of their decisions could be affected by potential changes in both climate and land use. On an interactive, user-friendly website, CARA has amassed data on climate (historical records and future projections for seven global climate models), land cover, and socioeconomic and environmental variables, along with tools to help decision makers tailor the data for their own decision types and locations. CARA Advisory Council stakeholders help identify what information and tools stakeholders would find most useful and how to present these; they also provide in-depth feedback for subregion case studies. General lessons include: (1) decision makers want detailed local projections for periods short enough to account for extreme events, in contrast to the broader spatial and temporal observations and projections that are available or consistent at a regional level; (2) stakeholders will not use such a website unless it is visually appealing and easy to find the information they want; (3) some stakeholders need background while others want to go immediately to data, and some want maps while others want text or tables. This article also compares what has been learned across case studies of Cape May County, New Jersey, Cape Cod, Massachusetts, and Hampton Roads, Virginia, relating specifically to sea-level rise. Lessons include: (1) groups can be affected differently by physical dangers compared with economic dangers; (2) decisions will differ according to decision makers' preferences about waiting and risk tolerance; (3) future scenarios and maps can help assess the impacts of dangers to emergency evacuation routes, homes, and infrastructure, and the natural environment; (4) residents' and decision makers' perceptions are affected by information about potential local impacts from global climate change.

Journal Article↗
PubMed2006

The role of leader influence tactics and safety climate in engaging employees' safety participation.

This study examines the effect of leader influence tactics on employee safety participation in a U.K.-based manufacturing organization, examining the role of safety climate as a mediator. Structural equation modeling showed that leader influence tactics associated with a transformational leadership style had significant relationships with safety participation that were partially mediated by the safety climate (consultation) or fully mediated by the safety climate (inspirational appeals). In addition, leader influence tactics associated with a transactional leadership style had significant relationships with safety participation: rational persuasion (partially mediated by safety climate) and coalition tactics (direct effect). Thus, leaders may encourage safety participation using a combination of influence tactics, based on rational arguments, involvement in decision making, and generating enthusiasm for safety. The influence of building trust in managers is discussed as an underlying mechanism in this relationship. Practical implications are highlighted, including the design of leadership development programs, which may be particularly suited to high-reliability organizations.

Journal Article↗