New Indices for Better Understanding ENSO by Incorporating Convection Sensitivity to Sea Surface Temperature

doi:10.1175/JCLI-D-19-0239.1

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	New Indices for Better Understanding ENSO by Incorporating Convection Sensitivity to Sea Surface Temperature
	Xie, Ruihuang 1,2,3; Mu, Mu 4,5; Fang, Xianghui 4,5
刊名	JOURNAL OF CLIMATE
	2020-08-15
卷号	33 期号:16 页码:7045-7061
ISSN号	0894-8755
DOI	10.1175/JCLI-D-19-0239.1
通讯作者	Mu, Mu(mumu@fudan.edu.cn)
英文摘要	Observed outgoing longwave radiation (OLR) data indicate that convection is nonlinearly sensitive to sea surface temperature anomalies (SSTA) for background SSTs in the 25.25 degrees-30.25 degrees C high-impact range. In this study, we use that observed convection sensitivity to derive a proxy of the convective responses to SSTA only [referred to as fluctuations of the accumulated convection strength (FACT)]. FACT reproduces the pattern of the observed convection response to ENSO in the central and eastern Pacific, but underestimates the amplitude due to the exclusion of the effect of ENSO-induced atmospheric convergence anomalies on convection. We thus use FACT to define new indices (InFACT) of ENSO diversity that explicitly account for the nonlinear convection-SST sensitivity. The amplitude of InFACT allows us to easily classify El Nifio events into weak, moderate, and strong types that markedly differ in terms of SSTA spatial patterns and their convective responses. La Nina events classified by InFACT display much less pattern diversity, and mostly differ through their amplitudes. Finally, our study supports some previous studies that the nonlinear SST-convection relation plays a strong role for the development of extreme El Nino events with the presence of high-impact SSTs and large convection anomalies in the equatorial eastern Pacific.
资助项目	National Programme on Global Change and Air-Sea Interaction[GASI-IPOVAI-06] ; National Natural Science Foundation of China (NSFC)[41676007] ; National Natural Science Foundation of China (NSFC)[41976015] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406402] ; NSFC[41230420]
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER METEOROLOGICAL SOC
WOS记录号	WOS:000589972600016
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/169414]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Mu, Mu
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Ocean & Climate Dynam, Qingdao, Peoples R China 4.Fudan Univ, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China 5.Fudan Univ, Inst Atmospher Sci, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Xie, Ruihuang,Mu, Mu,Fang, Xianghui. New Indices for Better Understanding ENSO by Incorporating Convection Sensitivity to Sea Surface Temperature[J]. JOURNAL OF CLIMATE,2020,33(16):7045-7061.
APA	Xie, Ruihuang,Mu, Mu,&Fang, Xianghui.(2020).New Indices for Better Understanding ENSO by Incorporating Convection Sensitivity to Sea Surface Temperature.JOURNAL OF CLIMATE,33(16),7045-7061.
MLA	Xie, Ruihuang,et al."New Indices for Better Understanding ENSO by Incorporating Convection Sensitivity to Sea Surface Temperature".JOURNAL OF CLIMATE 33.16(2020):7045-7061.