气候变化领域集成服务门户(CCPortal): Impact of the north atlantic warming hole on sensible weather

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DOI	10.1175/JCLI-D-19-0636.1
	Impact of the north atlantic warming hole on sensible weather
	Gervais M.; Shaman J.; Kushnir Y.
发表日期	2020
ISSN	0894-8755
起始页码	4255
结束页码	4271
卷号	33 期号:10
英文摘要	In future climate projections there is a notable lack of warming in the North Atlantic subpolar gyre, known as the North Atlantic warming hole (NAWH). In a set of large-ensemble atmospheric simulations with the Community Earth System Model, the NAWH was previously shown to contribute to the projected poleward shift and eastward elongation of the North Atlantic jet. The current study investigates the impact of the warming hole on sensible weather, particularly over Europe, using the same simulations. North Atlantic jet regimes are classified within the model simulations by applying self-organizing maps analysis to winter daily wind speeds on the dynamic tropopause. The NAWH is found to increase the prevalence of jet regimes with stronger and more-poleward-shifted jets. A previously identified transient eddy-mean response to the NAWH that leads to a downstream enhancement of wind speeds is found to be dependent on the jet regime. These localized regime-specific changes vary by latitude and strength, combining to form the broad increase in seasonal-mean wind speeds over Eurasia. Impacts on surface temperature and precipitation within the various North Atlantic jet regimes are also investigated. A large decrease in surface temperature over Eurasia is found to be associated with the NAWH in regimes where air masses are advected eastward over the subpolar gyre prior to reaching Eurasia. Precipitation is found to be locally suppressed over the warming hole region and increased directly downstream. The impact of this downstream response on coastal European precipitation is dependent on the strength of the NAWH. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Atmospheric temperature; Conformal mapping; Self organizing maps; Surface properties; Wind; Atmospheric simulations; Earth system model; European precipitations; Future climate projections; Model simulation; Poleward shift; Subpolar gyres; Surface temperatures; Oceanography; climate change; climate effect; climate modeling; computer simulation; ensemble forecasting; future prospect; gyre; sea surface temperature; warming; weather forecasting; wind velocity; Atlantic Ocean; Atlantic Ocean (North)
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171323
作者单位	Department of Meteorology and Atmospheric Science, Institute for CyberScience, Pennsylvania State University, University Park, PA, United States; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; Department of Environmental Health Sciences, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States
推荐引用方式 GB/T 7714	Gervais M.,Shaman J.,Kushnir Y.. Impact of the north atlantic warming hole on sensible weather[J],2020,33(10).
APA	Gervais M.,Shaman J.,&Kushnir Y..(2020).Impact of the north atlantic warming hole on sensible weather.Journal of Climate,33(10).
MLA	Gervais M.,et al."Impact of the north atlantic warming hole on sensible weather".Journal of Climate 33.10(2020).