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How the central-western equatorial Pacific easterly wind in early 2022 affects the third-year La Ni?a occurrence

文献类型：期刊论文

作者Chen, Maonan3,4; Gao, Chuan2,4; Zhang, Rong-Hua1,2,3
刊名CLIMATE DYNAMICS
出版日期2023-12-31
页码20
关键词Triple-dip La Nina evolution Anomalous surface easterly wind Competing effects Kelvin waves and Rossby waves Modeling experiments
ISSN号0930-7575
DOI10.1007/s00382-023-07050-9
通讯作者Gao, Chuan(Gaochuan@qdio.ac.cn) ; Zhang, Rong-Hua(rzhang@nuist.edu.cn)
英文摘要After consecutive two years with the La Nina phenomenon in 2020-2021, cold sea surface temperature (SST) anomalies in the central-eastern equatorial Pacific persisted in 2022, known as a "triple-dip" La Nina event. These conditions have had a profound impact on global weather and climate. Understanding the underlying processes and mechanisms is crucial for improving ENSO prediction and has significant socioeconomic implications. In this study, we investigate the processes responsible for the evolution of the third-year La Nina event in 2022 based on related observations and an intermediate coupled model (ICM). The results show that two factors are essential for the development of the third-year La Nina event: surface easterly wind anomalies over the central-western equatorial Pacific in early 2022 and the induced cold SST anomalies by the former. In the first half of 2022, mainly due to the off-equatorial downwelling Rossby wave reflection at the western boundary, the equatorial downwelling Kelvin waves continuously induce warming effect in the upper ocean, acting to weaken the cold SST anomalies in the central-eastern Pacific. However, the easterly wind anomalies over the central-western equatorial Pacific during February-March 2022 induce upwelling Kelvin waves, whose cooling effect reverses the warming SST tendency. Afterward, despite the pronounced warming effect induced by the reflected downwelling Kelvin waves, the wind-induced cold SST anomalies persist on the equator during the equatorial cold season, which are further intensified by the Bjerknes feedback. Sensitivity experiments based on the ICM further confirm these outcomes. When the cooling effect induced by the easterly wind anomalies is included in ocean initial conditions, the ICM can accurately capture the reappearance of the La Nina phenomenon. These results highlight the importance of anomalous easterlies in the central-western equatorial Pacific during the decaying phase of the La Nina event.
WOS关键词EL-NINO ; THERMOCLINE DEPTH ; COUPLED MODEL ; OCEAN MODEL ; ENSO ; TEMPERATURE ; EVENTS ; TELECONNECTIONS ; OSCILLATION ; TRANSITION
资助项目National Natural Science Foundation of China[42030410] ; National Natural Science Foundation of China[42176032] ; National Natural Science Foundation of China[LSKJ202202402] ; National Natural Science Foundation of China (NFSC)[XDB40000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Startup Foundation for Introducing Talent of NUIST
WOS研究方向Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:001132636600001
出版者SPRINGER
源URL[http://ir.qdio.ac.cn/handle/337002/199663]  
专题海洋研究所_海洋环流与波动重点实验室
通讯作者Gao, Chuan; Zhang, Rong-Hua
作者单位1.Nanjing Univ Informat Sci & Technol, Sch Marine Sci, Nanjing 210044, Peoples R China
2.Laoshan Lab, Qingdao 266237, Peoples R China
3.Univ Chinese Acad Sci, Beijing 101408, Peoples R China
4.Chinese Acad Sci, CAS Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Maonan,Gao, Chuan,Zhang, Rong-Hua. How the central-western equatorial Pacific easterly wind in early 2022 affects the third-year La Ni?a occurrence[J]. CLIMATE DYNAMICS,2023:20.
APA Chen, Maonan,Gao, Chuan,&Zhang, Rong-Hua.(2023).How the central-western equatorial Pacific easterly wind in early 2022 affects the third-year La Ni?a occurrence.CLIMATE DYNAMICS,20.
MLA Chen, Maonan,et al."How the central-western equatorial Pacific easterly wind in early 2022 affects the third-year La Ni?a occurrence".CLIMATE DYNAMICS (2023):20.

入库方式： OAI收割

来源：海洋研究所

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