气候变化领域集成服务门户(CCPortal): Subseasonal atmospheric regimes and ocean background forcing of Pacific Arctic sea ice melt onset

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DOI	10.1007/s00382-018-4467-x
	Subseasonal atmospheric regimes and ocean background forcing of Pacific Arctic sea ice melt onset
	Ballinger T.J.; Lee C.C.; Sheridan S.C.; Crawford A.D.; Overland J.E.; Wang M.
发表日期	2019
ISSN	0930-7575
起始页码	5657
结束页码	5672
卷号	52 期号:2020-09-10
英文摘要	One observed fingerprint of Pacific Arctic environmental change, induced by climate warming and amplified local feedbacks, is a shift toward earlier onset of sea ice melt. Shorter freeze periods impact the melt season energy balance with cascading effects on ecological productivity and human presence in the region. Through this study, a non-linear technique, self-organizing maps, is utilized to investigate the subseasonal role of regional pressure patterns and associated lower-tropospheric wind regimes on melt onset in the Beaufort and Chukchi Seas. Focus is directed on the frequency and duration (≥ 3 consecutive days) of offshore, onshore, and zonal/weak flow that tend to precede anomalous (late and early) and average times of melt. Background North Pacific climate forcing ascribed from the Pacific Decadal Oscillation (PDO) phase and Bering Strait oceanic heat flux measurements provide a surface thermal context to the composite wind fields. In early melt onset years, onshore (northerly) winds occur approximately 1–3 fewer days with offsetting increases in zonal and offshore flow in the Beaufort and Chukchi Seas. During these cases, the Beaufort High pattern tends to set-up more frequently around the southeastern Beaufort Sea region, yielding winds of a southerly and/or easterly nature that are enhanced by cyclone activity to the south or downstream. Chukchi Sea weather analyses, in particular, suggest that interacting, precursor mechanisms involving warm air advection off snow-free Arctic lands and from southerly latitudes coupled with a slightly positive PDO state and anomalous, poleward oceanic heat transfer condition the seasonal ice pack for increasingly early melt. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Melt onset; Pacific Arctic; Pacific Decadal Oscillation; Sea ice; Self-organizing maps
语种	英语
scopus关键词	air-sea interaction; atmospheric forcing; atmospheric pressure; energy balance; environmental change; Pacific Decadal Oscillation; sea ice; troposphere; wind; Arctic Ocean; Beaufort Sea; Chukchi Sea
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/146345
作者单位	Department of Geography, Texas State University, 601 University Drive, San Marcos, TX 78666, United States; Department of Geography, Kent State University, Kent, OH, United States; Department of Geology, The College of Wooster, Wooster, OH, United States; NOAA/PMEL, Seattle, WA, United States; University of Washington/JISAO, Seattle, WA, United States
推荐引用方式 GB/T 7714	Ballinger T.J.,Lee C.C.,Sheridan S.C.,et al. Subseasonal atmospheric regimes and ocean background forcing of Pacific Arctic sea ice melt onset[J],2019,52(2020-09-10).
APA	Ballinger T.J.,Lee C.C.,Sheridan S.C.,Crawford A.D.,Overland J.E.,&Wang M..(2019).Subseasonal atmospheric regimes and ocean background forcing of Pacific Arctic sea ice melt onset.Climate Dynamics,52(2020-09-10).
MLA	Ballinger T.J.,et al."Subseasonal atmospheric regimes and ocean background forcing of Pacific Arctic sea ice melt onset".Climate Dynamics 52.2020-09-10(2019).