气候变化领域集成服务门户(CCPortal): On the Role of Pacific-Atlantic SST Contrast and Associated Caribbean Sea Convection in August–October U.S. Regional Rainfall Variability

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DOI	10.1029/2020GL087736
	On the Role of Pacific-Atlantic SST Contrast and Associated Caribbean Sea Convection in August–October U.S. Regional Rainfall Variability
	Kim D.; Lee S.-K.; Lopez H.; Foltz G.R.; Misra V.; Kumar A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:11
英文摘要	This study investigates the large-scale atmospheric processes that lead to U.S. precipitation variability in late summer to midfall (August–October; ASO) and shows that the well-recognized relationship between North Atlantic Subtropical High and U.S. precipitation in peak summer (June–August) significantly weakens in ASO. The working hypothesis derived from our analysis is that in ASO convective activity in the Caribbean Sea, modulated by the tropical Pacific-Atlantic sea surface temperature (SST) anomaly contrast, directly influences the North American Low-Level Jet and thus U.S. precipitation east of the Rockies, through a Gill-type response. This hypothesis derived from observations is strongly supported by a long-term climate model simulation and by a linear baroclinic atmospheric model with prescribed diabatic forcings in the Caribbean Sea. This study integrates key findings from previous studies and advances a consistent physical rationale that links the Pacific-Atlantic SST anomaly contrast, Caribbean Sea convective activity, and U.S. rainfall in ASO. ©2020. American Geophysical Union. All Rights Reserved. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
英文关键词	Atmospheric movements; Climate models; Rain; Surface waters; Tropics; Atmospheric model; Atmospheric process; Climate model simulations; Convective activity; North American; North Atlantic; Precipitation variability; Rainfall variability; Oceanography; atmosphere-ocean coupling; baroclinic motion; climate modeling; oceanic convection; precipitation assessment; rainfall; regional climate; sea surface temperature; subtropical region; temperature anomaly; Atlantic Ocean; Atlantic Ocean (North); Caribbean Sea; Pacific Ocean; Rocky Mountains
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170290
作者单位	Cooperative Institute for Marine and Atmospheric Studies, University of Miami, Miami, FL, United States; Atlantic Oceanographic and Meteorological Laboratory, NOAA, Miami, FL, United States; Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, United States; Climate Prediction Center, NOAA, College Park, MD, United States
推荐引用方式 GB/T 7714	Kim D.,Lee S.-K.,Lopez H.,等. On the Role of Pacific-Atlantic SST Contrast and Associated Caribbean Sea Convection in August–October U.S. Regional Rainfall Variability[J],2020,47(11).
APA	Kim D.,Lee S.-K.,Lopez H.,Foltz G.R.,Misra V.,&Kumar A..(2020).On the Role of Pacific-Atlantic SST Contrast and Associated Caribbean Sea Convection in August–October U.S. Regional Rainfall Variability.Geophysical Research Letters,47(11).
MLA	Kim D.,et al."On the Role of Pacific-Atlantic SST Contrast and Associated Caribbean Sea Convection in August–October U.S. Regional Rainfall Variability".Geophysical Research Letters 47.11(2020).