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DOI	10.1088/1748-9326/ab986d
	Long-term trends and impacts of polar cold airmass in boreal summer
	Liu Q.; Chen G.; Iwasaki T.
发表日期	2020
ISSN	17489318
卷号	15 期号:8
英文摘要	The northern polar region possesses the most extensive cold airmass on Northern Hemisphere. The generation of this polar cold airmass and its outflow to lower latitudes play an important role in the climate system in terms of mass and heat exchanges. However, long-term changes in the polar cold airmass, especially in summer, and the climatic effects on mid-high latitudes are still unclear. Using an isentropic approach, we quantitatively show that the polar cold airmass amount has decreased rapidly since the 1980s, with a decade lagging behind the global warming. The equatorward flux of the cold airmass has also weakened, trapping the cold airmass in its source region. These profound changes in the cold airmass coincide with a period characterized by rapid surface warming and increasingly frequent heat waves in recent three decades over the mid-high latitude continents. Owing to regional differences in the cold airmass reduction, Europe and North America have experienced a surface warming faster than the Northern Hemisphere mean. Furthermore, such a long-term trend in the polar cold airmass can be attributed to Arctic sea ice loss and internal decadal variability of sea surface temperature in high-latitude oceans. Our results highlight that the isentropic analysis of cold airmass may serve a good detection of the climate change at polar region and mid-high latitudes. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	climate change; cold airmass; heat wave; isentropic analysis; mid-high latitudes
语种	英语
scopus关键词	Global warming; Oceanography; Sea ice; Climatic effects; Decadal variability; Isentropic analysis; Long term change; Mass and heat exchange; Northern Hemispheres; Regional differences; Sea surface temperature (SST); Surface waters; air mass; air temperature; climate variation; global warming; long-term change; Northern Hemisphere; polar region; sea ice; sea surface temperature; summer; trend analysis; Arctic; Europe; North America
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153868
作者单位	School of Atmospheric Sciences, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Japan
推荐引用方式 GB/T 7714	Liu Q.,Chen G.,Iwasaki T.. Long-term trends and impacts of polar cold airmass in boreal summer[J],2020,15(8).
APA	Liu Q.,Chen G.,&Iwasaki T..(2020).Long-term trends and impacts of polar cold airmass in boreal summer.Environmental Research Letters,15(8).
MLA	Liu Q.,et al."Long-term trends and impacts of polar cold airmass in boreal summer".Environmental Research Letters 15.8(2020).