The 2020-2021 prolonged La Nina evolution in the tropical Pacific

doi:10.1007/s11430-022-9985-4

IOCAS-IR > 海洋环流与波动重点实验室

	The 2020-2021 prolonged La Nina evolution in the tropical Pacific
	Gao, Chuan1,2 ; Chen, Maonan 1,4; Zhou, Lu 1,4; Feng, Licheng 6; Zhang, Rong-Hua1,2,3,4,5
	2022-11-10
发表期刊	SCIENCE CHINA-EARTH SCIENCES
ISSN	1674-7313
页码	19
通讯作者	Zhang, Rong-Hua(rzhang@qdio.ac.cn)
摘要	The evolution of sea surface temperature (SST) in the tropical Pacific during 2020-2021 indicates a second-year cooling in late 2021 again, following the 2020 La Nina event. Its physical explanations are still lacking, and there is a clear need to understand the underlying processes involved. Observational data and reanalysis products are used to describe the characteristics and spatiotemporal evolution of upper-ocean thermal anomalies; an intermediate coupled model (ICM) is also used to perform numerical experiments to confirm these observation-based inferences. The evolution of subsurface thermal anomalies is critically important to that of SST in the central-eastern equatorial Pacific; the effects of the former on the latter can be well represented by the temperature of subsurface waters entrained into the mixed layer (T-e), a field that reflects a subsurface forcing on SST. The SST evolution is sensitively dependent on the intensities of the local effect associated with T-e anomalies in the eastern equatorial Pacific and the remote effect associated with subsurface anomalies from the western Pacific. During early- and mid-2021, a competition was present between these local and remote effects associated with T-e anomalies. When the remote warming effect dominates the local cooling effect, the cold SST condition in the east is likely to turn into neutral and warm conditions; otherwise, it tends to continue. In addition, the negative T-e anomalies were sustained and enhanced by off-equatorial processes due to equatorial wave reflections at the eastern boundary associated with the 2020 La Nina event. The SST evolution in mid-2021 corresponded to a situation in which the warming effect associated with positive subsurface thermal anomalies from the west were not strong enough to counteract the local cooling effect associated with negative anomalies in the east. In due course, cold SST anomalies in the east developed again and the second-year cooling reoccurred in late 2021, with a turning point in June 2021. Modeling experiments support these arguments and indicate that the intensity of subsurface thermal effect on SST, as represented by T-e anomalies, needs to be adequately depicted for coupled models to capture the 2021 second-year cooling conditions in the tropical Pacific.
关键词	Prolonged La Nina evolution in 2020-2021 Subsurface effect on SST Remote and local processes Modeling experiments
DOI	10.1007/s11430-022-9985-4
收录类别	SCI
语种	英语
资助项目	Laoshan Laboratory[2022LSL010301-2] ; National Natural Science Foundation of China[42030410] ; National Natural Science Foundation of China[42176032] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA19060102] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 40000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 42000000]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000882355800001
出版者	SCIENCE PRESS
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/180299
专题	海洋环流与波动重点实验室
通讯作者	Zhang, Rong-Hua
作者单位	1.Chinese Acad Sci, Inst Oceanol, Ctr Ocean Megasci, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Laoshan Lab, Qingdao 266237, Peoples R China 3.Nanjing Univ Informat Sci & Technol, Sch Marine Sci, Nanjing 210044, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100029, Peoples R China 5.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 6.Minist Nat Resources, Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R China
第一作者单位	中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Gao, Chuan,Chen, Maonan,Zhou, Lu,et al. The 2020-2021 prolonged La Nina evolution in the tropical Pacific[J]. SCIENCE CHINA-EARTH SCIENCES,2022:19.
APA	Gao, Chuan,Chen, Maonan,Zhou, Lu,Feng, Licheng,&Zhang, Rong-Hua.(2022).The 2020-2021 prolonged La Nina evolution in the tropical Pacific.SCIENCE CHINA-EARTH SCIENCES,19.
MLA	Gao, Chuan,et al."The 2020-2021 prolonged La Nina evolution in the tropical Pacific".SCIENCE CHINA-EARTH SCIENCES (2022):19.

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