气候变化领域集成服务门户(CCPortal): Trends in weather type frequencies across North America

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DOI	10.1038/s41612-018-0051-7
	Trends in weather type frequencies across North America
	Lee C.C.; Sheridan S.C.
发表日期	2018
ISSN	23973722
卷号	1 期号:1
英文摘要	While 20th century changes in many individual meteorological variables are well documented, the trends in multivariate synoptic-scale air masses—or weather types—largely remain unexplored. Utilizing a recently developed gridded weather typing classification system, this research investigates the changes in the frequency of weather types (WTs) across North America, 1979–2017. Averaged across the study domain as a whole, Humid Warm WTs are occurring 22 more days per year, while Dry Warm WTs have increased by 10 days/year. These increases are offset mostly by decreased frequency of Dry Cool (−17 days/year) and Cool WTs (−21 days/year). The largest absolute changes are in the Canadian Archipelago, where the Warm WT is occurring 42 more days/year and the Cool WT is occurring 48 fewer times per year. In western Canada all humid types are occurring more frequently, including a Humid Cool type that is occurring 16 more days/year. The Desert Southwest US and northern Mexico show significant increases in Dry Warm WTs (+33 to +40 days/year). Cold front and warm front passages show increases in most of the US and decreases in most of Canada. Describing these secular changes to the frequency of intuitive weather types may be an effective means of communicating these climate trends to policymakers and the general public, especially considering their large magnitude. © 2018, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
语种	英语
scopus关键词	air mass; classification; frequency analysis; humidity; meteorology; multivariate analysis; synoptic meteorology; trend analysis; weather; North America
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178171
作者单位	Department of Geography, Kent State University, Kent, OH 44242, United States
推荐引用方式 GB/T 7714	Lee C.C.,Sheridan S.C.. Trends in weather type frequencies across North America[J],2018,1(1).
APA	Lee C.C.,&Sheridan S.C..(2018).Trends in weather type frequencies across North America.npj Climate and Atmospheric Science,1(1).
MLA	Lee C.C.,et al."Trends in weather type frequencies across North America".npj Climate and Atmospheric Science 1.1(2018).