Contrasting Regional Carbon Cycle Responses to Seasonal Climate Anomalies Across the East-West Divide of Temperate North America.

Across temperate North America, interannual variability (IAV) in gross primary production (GPP) and net ecosystem exchange (NEE) and their relationship with environmental drivers are poorly understood. Here, we examine IAV in GPP and NEE and their relationship to environmental drivers using two state-of-the-science flux products: NEE constrained by surface and space-based atmospheric CO2 measurements over 2010-2015 and satellite up-scaled GPP from FluxSat over 2001-2017. We show that the arid western half of temperate North America provides a larger contribution to IAV in GPP (104% of east) and NEE (127% of east) than the eastern half, in spite of smaller magnitude of annual mean GPP and NEE. This occurs because anomalies in western ecosystems are temporally coherent across the growing season leading to an amplification of GPP and NEE. In contrast, IAV in GPP and NEE in eastern ecosystems is dominated by seasonal compensation effects, associated with opposite responses to temperature anomalies in spring and summer. Terrestrial biosphere models in the MsTMIP ensemble generally capture these differences between eastern and western temperate North America, although there is considerable spread between models.

Balance of Emission and Dynamical Controls on Ozone During the Korea-United States Air Quality Campaign From Multiconstituent Satellite Data Assimilation.

Global multiconstituent concentration and emission fields obtained from the assimilation of the satellite retrievals of ozone, CO, NO2, HNO3, and SO2 from the Ozone Monitoring Instrument (OMI), Global Ozone Monitoring Experiment 2, Measurements of Pollution in the Troposphere, Microwave Limb Sounder, and Atmospheric Infrared Sounder (AIRS)/OMI are used to understand the processes controlling air pollution during the Korea-United States Air Quality (KORUS-AQ) campaign. Estimated emissions in South Korea were 0.42 Tg N for NO x and 1.1 Tg CO for CO, which were 40% and 83% higher, respectively, than the a priori bottom-up inventories, and increased mean ozone concentration by up to 7.5 ± 1.6 ppbv. The observed boundary layer ozone exceeded 90 ppbv over Seoul under stagnant phases, whereas it was approximately 60 ppbv during dynamical conditions given equivalent emissions. Chemical reanalysis showed that mean ozone concentration was persistently higher over Seoul (75.10 ± 7.6 ppbv) than the broader KORUS-AQ domain (70.5 ± 9.2 ppbv) at 700 hPa. Large bias reductions (>75%) in the free tropospheric OH show that multiple-species assimilation is critical for balanced tropospheric chemistry analysis and emissions. The assimilation performance was dependent on the particular phase. While the evaluation of data assimilation fields shows an improved agreement with aircraft measurements in ozone (to less than 5 ppbv biases), CO, NO2, SO2, PAN, and OH profiles, lower tropospheric ozone analysis error was largest at stagnant conditions, whereas the model errors were mostly removed by data assimilation under dynamic weather conditions. Assimilation of new AIRS/OMI ozone profiles allowed for additional error reductions, especially under dynamic weather conditions. Our results show the important balance of dynamics and emissions both on pollution and the chemical assimilation system performance.

Chinese seniors' perspectives on end-of-life decisions.

Making end-of-life decisions is a painful and difficult process; one that can be intensified by cultural differences between physicians and their patients. The objective of this study was to examine attitudes of Chinese seniors towards end-of-life decisions. We conducted a qualitative survey in a Chinese community centre in Toronto, Canada. Face-to-face interviews, in Cantonese, were conducted with 40 Chinese seniors 65 years of age or older. Respondents based their end-of-life decision making on the following factors: hope, suffering and burden, the future, emotional harmony, the life cycle, respect for doctors, and the family. Respondents rejected advance directives. Respondents' attitudes toward end-of-life decision making can be understood through the lens of values from Confucianist, Buddhist and Taoist traditions. Health care workers can best achieve quality end-of-life care--and address the cultural differences that may arise--by focusing primarily on understanding the perspectives of patients and their families, and by continually striving for balanced and open communication at all stages of the caregiving process.

Hospital policy on appropriate use of life-sustaining treatment. University of Toronto Joint Centre for Bioethics/Critical Care Medicine Program Task Force.

OBJECTIVE: To describe the issues faced, and how they were addressed, by the University of Toronto Critical Care Medicine Program/Joint Centre for Bioethics Task Force on Appropriate Use of Life-Sustaining Treatment. The clinical problem addressed by the Task Force was dealing with requests by patients or substitute decision makers for life-sustaining treatment that their healthcare providers believe is inappropriate. DESIGN: Case study. SETTING: The University of Toronto Joint Centre for Bioethics/Critical Care Medicine Program Task Force on Appropriate Use of Life-Sustaining Treatment. PARTICIPANTS: The 24-member Task Force included physician and nursing leaders from five critical care units, bioethicists, a legal scholar, a health administration expert, a social worker, and a hospital public relations professional. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Our specific lessons learned include a) a policy focus on process; b) use of a negotiation and mediation model, rather than a hospital ethics committee model, for this process; and c) the policy development process is itself a negotiation, so we recommend equal involvement of interested groups including patients, families, and the public. CONCLUSIONS: This article describes the key issues faced by the Task Force while developing its policy. It will provide a useful starting point for other groups developing policy on appropriate use of life-sustaining treatment.

Communication, negotiation, and mediation: dealing with conflict in end-of-life decisions.

In recent years, it has become possible for the end of life to be a negotiated event, particularly in the intensive care unit. A multitude of often unidentified and poorly understood factors affect such negotiations. These include, family dynamics, ever-changing health care teams, inconsistent opinions about prognosis, and cultural differences between physicians, and patients and their families. When these factors converge, conflict may erupt. This article explores the nature, antecedents, and cost of such conflict. Arguments for the importance of balanced communication, negotiation, and mediation in end-of-life care are put forward.

Bioethics for clinicians: 20. Chinese bioethics.

Chinese Canadians form one of the largest groups in the Canadian cultural mosaic. Many of the assumptions implicit in a Western autonomy-based approach to bioethical deliberation may not be shared by Chinese Canadians. In traditional Chinese culture, greater social and moral meaning rests in the interdependence of family and community, which overrides self-determination. Consequently, many Chinese may vest in family members the right to receive and disclose information, to make decisions and to organize patient care. Furthermore, interactions between Chinese patients and health care workers may be affected by important differences in values and goals and in the perception of the nature and meaning of illness. Acknowledging and negotiating these differences can lead to considerable improvement in communication and in the quality of care.

Instrument line-shape modeling and correction for off-axis detectors in fourier-transform spectrometry.

Spectra measured by off-axis detectors in a high-resolution Fourier-transform spectrometer are characterized by frequency scaling, asymmetry and broadening of their line shape, and self-apodization in the corresponding interferogram. For a narrow-band input spectrum and a specified detector geometry, a formalism is presented that accounts for these effects with separate terms. Some of the terms are used to correct the larger off-axis effects as part of the calibration. The remaining terms are used to model the residual effects with the on-axis instrument line shape. We extend this approach to the broadband case using filter banks. The technique is applied to simulated spectra for the Tropospheric Emissions Spectrometer. This approach is shown to maintain a radiometric accuracy to less than 0.1%.