Roles of Wind Stress and Subsurface Cold Water in the Second-Year Cooling of the 2017/18 La Nina Event

doi:10.1007/s00376-020-0028-4

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

	Roles of Wind Stress and Subsurface Cold Water in the Second-Year Cooling of the 2017/18 La Nina Event
	Feng, Licheng 2,5; Zhang, Rong-Hua 3,4,6,7; Yu, Bo 1; Han, Xue 5
刊名	ADVANCES IN ATMOSPHERIC SCIENCES
	2020-08-01
卷号	37 期号:8 页码:847-860
关键词	2017 18 La Nina second-year cooling in 2017 wind stress anomalies subsurface cold anomalies
ISSN号	0256-1530
DOI	10.1007/s00376-020-0028-4
英文摘要	After the strong 2015/16 El Nino event, cold conditions prevailed in the tropical Pacific with the second-year cooling of the 2017/18 La Nina event. Many coupled models failed to predict the cold SST anomalies (SSTAs) in 2017. By using the ERA5 and GODAS (Global Ocean Data Assimilation System) products, atmospheric and oceanic factors were examined that could have been responsible for the second-year cooling, including surface wind and the subsurface thermal state. A time sequence is described to demonstrate how the cold SSTAs were produced in the central-eastern equatorial Pacific in late 2017. Since July 2017, easterly anomalies strengthened in the central Pacific; in the meantime, wind stress divergence anomalies emerged in the far eastern region, which strengthened during the following months and propagated westward, contributing to the development of the second-year cooling in 2017. At the subsurface, weak negative temperature anomalies were accompanied by upwelling in the eastern equatorial Pacific, which provided the cold water source for the sea surface. Thereafter, both the cold anomalies and upwelling were enhanced and extended westward in the centraleastern equatorial Pacific. These changes were associated with the seasonally weakened EUC (the Equatorial Undercurrent) and strengthened SEC (the South Equatorial Current), which favored more cold waters being accumulated in the central-equatorial Pacific. Then, the subsurface cold waters stretched upward with the convergence of the horizontal currents and eventually outcropped to the surface. The subsurface-induced SSTAs acted to induce local coupled air-sea interactions, which generated atmospheric-oceanic anomalies developing and evolving into the second-year cooling in the fall of 2017.
资助项目	National Natural Science Foundation of China[41576029] ; National Natural Science Foundation of China[41690122(41690120)] ; National Program on Global Change and Air-Sea Interaction[GASIIPOVAI-03] ; National Key Research and Development Program[2018YFC1505802] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA19060102] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 40000000]
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000552173600002
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/168069]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Zhang, Rong-Hua
作者单位	1.Beijing Weather Forecast Ctr, Beijing 100089, Peoples R China 2.Minist Nat Resources, Key Lab Marine Hazards Forecasting, Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 5.Minist Nat Resources, Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R China 6.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 7.Pilot Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China
推荐引用方式 GB/T 7714	Feng, Licheng,Zhang, Rong-Hua,Yu, Bo,et al. Roles of Wind Stress and Subsurface Cold Water in the Second-Year Cooling of the 2017/18 La Nina Event[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2020,37(8):847-860.
APA	Feng, Licheng,Zhang, Rong-Hua,Yu, Bo,&Han, Xue.(2020).Roles of Wind Stress and Subsurface Cold Water in the Second-Year Cooling of the 2017/18 La Nina Event.ADVANCES IN ATMOSPHERIC SCIENCES,37(8),847-860.
MLA	Feng, Licheng,et al."Roles of Wind Stress and Subsurface Cold Water in the Second-Year Cooling of the 2017/18 La Nina Event".ADVANCES IN ATMOSPHERIC SCIENCES 37.8(2020):847-860.