On the Second-Year Warming in Late 2019 over the Tropical Pacific and Its Attribution to an Indian Ocean Dipole Event

doi:10.1007/s00376-021-1234-4

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

	On the Second-Year Warming in Late 2019 over the Tropical Pacific and Its Attribution to an Indian Ocean Dipole Event
	Feng, Licheng 7,8; Liu, Fei 4,5,6; Zhang, Rong-Hua 1,2,3; Han, Xue 7,8; Yu, Bo 9; Gao, Chuan 1,2,3
刊名	ADVANCES IN ATMOSPHERIC SCIENCES
	2021-12-01
卷号	38 期号:12 页码:2153-2166
关键词	second-year warming IOD wind stress anomalies zonal advection feedback thermocline feedback
ISSN号	0256-1530
DOI	10.1007/s00376-021-1234-4
通讯作者	Zhang, Rong-Hua(rzhang@qdio.ac.cn)
英文摘要	After its maturity, El Nino usually decays rapidly in the following summer and evolves into a La Nina pattern. However, this was not the case for the 2018/19 El Nino event. Based on multiple reanalysis data sets, the space-time evolution and triggering mechanism for the unusual second-year warming in late 2019, after the 2018/19 El Nino event, are investigated in the tropical Pacific. After a short decaying period associated with the 2018/19 El Nino condition, positive sea surface temperature anomalies (SSTAs) re-intensified in the eastern equatorial Pacific in late 2019. Compared with the composite pattern of El Nino in the following year, two key differences are evident in the evolution of SSTAs in 2019. First, is the persistence of the surface warming over the central equatorial Pacific in May, and second, is the re-intensification of the positive SSTAs over the eastern equatorial Pacific in September. Observational results suggest that the re-intensification of anomalous westerly winds over the western and central Pacific, induced remotely by an extreme Indian Ocean Dipole (IOD) event, acted as a triggering mechanism for the second-year warming in late 2019. That is, the IOD-related cold SSTAs in the eastern Indian Ocean established and sustained anomalous surface westerly winds over the western equatorial Pacific, which induced downwelling Kelvin waves propagating eastward along the equator. At the same time, the subsurface ocean provided plenty of warm water in the western and central equatorial Pacific. Mixed-layer heat budget analyses further confirm that positive zonal advection, induced by the anomalous westerly winds, and thermocline feedback played important roles in leading to the second-year warming in late 2019. This study provides new insights into the processes responsible for the diversity of El Nino evolution, which is important for improving the physical understanding and seasonal prediction of El Nino events.
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000716969500014
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/177185]
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.Pilot Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 4.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China 5.Sun Yat Sen Univ, Sch Atmospher Sci, Zhuhai 519082, Peoples R China 6.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Zhuhai 519082, Peoples R China 7.Minist Nat Resources, Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R China 8.Minist Nat Resources, Key Lab Marine Hazards Forecasting, Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R China 9.Beijing Weather Forecast Ctr, Beijing 100091, Peoples R China
推荐引用方式 GB/T 7714	Feng, Licheng,Liu, Fei,Zhang, Rong-Hua,et al. On the Second-Year Warming in Late 2019 over the Tropical Pacific and Its Attribution to an Indian Ocean Dipole Event[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2021,38(12):2153-2166.
APA	Feng, Licheng,Liu, Fei,Zhang, Rong-Hua,Han, Xue,Yu, Bo,&Gao, Chuan.(2021).On the Second-Year Warming in Late 2019 over the Tropical Pacific and Its Attribution to an Indian Ocean Dipole Event.ADVANCES IN ATMOSPHERIC SCIENCES,38(12),2153-2166.
MLA	Feng, Licheng,et al."On the Second-Year Warming in Late 2019 over the Tropical Pacific and Its Attribution to an Indian Ocean Dipole Event".ADVANCES IN ATMOSPHERIC SCIENCES 38.12(2021):2153-2166.