| DOI | 10.1088/1748-9326/aaf42b
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| Indicators and trends of polar cold airmass |
| Kanno Y.; Walsh J.E.; Abdillah M.R.; Yamaguchi J.; Iwasaki T.
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| 发表日期 | 2019
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| ISSN | 17489318
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| 卷号 | 14期号:2 |
| 英文摘要 | Trends and variations in the amount of cold airmass in the Arctic and the Northern Hemisphere are evaluated for the 60 year period, 1959-2018. The two indicators are (1) polar cold air mass (PCAM), which is the amount of air below a potential temperature threshold, and (2) negative heat content (NHC), which includes a weighting by coldness. Because the metrics of coldness are based on multiple layers in the atmosphere, they provide a more comprehensive framework for assessment of warming than is provided by surface air temperatures alone. The negative trends of PCAM and NHC are stronger (as a % per decade) when the threshold is 245 K rather than 280 K, indicating that the loss of extremely cold air is happening at a faster rate than the loss of moderately cold air. The loss of cold air has accelerated, as the most rapid loss of NHC has occurred in recent decades (1989-2018). The spatial patterns of the trends of PCAM and NHC provide another manifestation of Arctic amplification. Of the various teleconnection indices, the Atlantic Multidecadal Oscillation shows the strongest correlations with the spatially integrated metrics of moderate coldness. Several Pacific indices also correlate significantly with these indicators. However, the amount of extremely cold air mass does not correlate significantly with the indices of internal variability used here. © 2019 The Author(s). Published by IOP Publishing Ltd. |
| 英文关键词 | Arctic; climate; cold airmass; indicators |
| 语种 | 英语
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| scopus关键词 | Indicators (instruments); Research; Air mass; Arctic; Atlantic multidecadal oscillations; climate; Internal variability; Potential temperature; Surface air temperatures; Teleconnection indices; Environmental engineering; air mass; air temperature; amplification; arctic environment; Atlantic Multidecadal Oscillation; cold air; correlation; environmental assessment; environmental indicator; global warming; Northern Hemisphere; polar region; teleconnection; trend analysis; Pacific Ocean |
| 来源期刊 | Environmental Research Letters
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| 文献类型 | 期刊论文
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| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/154694
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| 作者单位 | Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan; Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; Alaska Center for Climate Assessment and Policy, University of Alaska Fairbanks, Fairbanks, AL, United States; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan; Atmospheric Science Research Group, Faculty of Earth Science and Technology, Institut Teknologi Bandung, Bandung, Indonesia
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推荐引用方式
GB/T 7714 |
Kanno Y.,Walsh J.E.,Abdillah M.R.,et al. Indicators and trends of polar cold airmass[J],2019,14(2).
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| APA |
Kanno Y.,Walsh J.E.,Abdillah M.R.,Yamaguchi J.,&Iwasaki T..(2019).Indicators and trends of polar cold airmass.Environmental Research Letters,14(2).
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| MLA |
Kanno Y.,et al."Indicators and trends of polar cold airmass".Environmental Research Letters 14.2(2019).
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