气候变化领域集成服务门户(CCPortal): Arctic sea ice melt onset favored by an atmospheric pressure pattern reminiscent of the North American-Eurasian Arctic pattern

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DOI	10.1007/s00382-021-05776-y
	Arctic sea ice melt onset favored by an atmospheric pressure pattern reminiscent of the North American-Eurasian Arctic pattern
	Horvath S.; Stroeve J.; Rajagopalan B.; Jahn A.
发表日期	2021
ISSN	0930-7575
起始页码	1161
结束页码	1180
英文摘要	The timing of melt onset in the Arctic plays a key role in the evolution of sea ice throughout Spring, Summer and Autumn. A major catalyst of early melt onset is increased downwelling longwave radiation, associated with increased levels of moisture in the atmosphere. Determining the atmospheric moisture pathways that are tied to increased downwelling longwave radiation and melt onset is therefore of keen interest. We employed Self Organizing Maps (SOM) on the daily sea level pressure for the period 1979–2018 over the Arctic during the melt season (April–July) and identified distinct circulation patterns. Melt onset dates were mapped on to these SOM patterns. The dominant moisture transport to much of the Arctic is enabled by a broad low pressure region stretching over Siberia and a high pressure over northern North America and Greenland. This configuration, which is reminiscent of the North American-Eurasian Arctic dipole pattern, funnels moisture from lower latitudes and through the Bering and Chukchi Seas. Other leading patterns are variations of this which transport moisture from North America and the Atlantic to the Central Arctic and Canadian Arctic Archipelago. Our analysis further indicates that most of the early and late melt onset timings in the Arctic are strongly related to the strong and weak emergence of these preferred circulation patterns, respectively. © 2021, The Author(s).
英文关键词	Arctic sea ice; Atmospheric circulation; Atmospheric moisture transport; Climate variability; Melt onset; Self organizing maps (SOM)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183470
作者单位	National Snow and Ice Data Center, University of Colorado, Boulder, United States; Cooperative Institute for Research in Environmental Sciences at University of Colorado, Boulder, United States; Earth Sciences Department, University College of London, London, United Kingdom; Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, United States; Department of Atmospheric and Oceanic Sciences and Institute of Arctic and Alpine Research, University of Colorado, Boulder, United States
推荐引用方式 GB/T 7714	Horvath S.,Stroeve J.,Rajagopalan B.,et al. Arctic sea ice melt onset favored by an atmospheric pressure pattern reminiscent of the North American-Eurasian Arctic pattern[J],2021.
APA	Horvath S.,Stroeve J.,Rajagopalan B.,&Jahn A..(2021).Arctic sea ice melt onset favored by an atmospheric pressure pattern reminiscent of the North American-Eurasian Arctic pattern.Climate Dynamics.
MLA	Horvath S.,et al."Arctic sea ice melt onset favored by an atmospheric pressure pattern reminiscent of the North American-Eurasian Arctic pattern".Climate Dynamics (2021).