气候变化领域集成服务门户(CCPortal): Attributing interdecadal variations of southern tropical Indian Ocean dipole mode to rhythms of Bjerknes feedback intensity

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DOI	10.1007/s00382-024-07102-8
	Attributing interdecadal variations of southern tropical Indian Ocean dipole mode to rhythms of Bjerknes feedback intensity
	Zhang, Guangli; Wang, Xin; Xie, Qiang; Huang, Bohua; Chen, Jiepeng; Fan, Hanjie; Wang, Dongxiao
发表日期	2024
ISSN	0930-7575
EISSN	1432-0894
英文摘要	The changes in the intensity of the southern tropical Indian Ocean dipole mode (STIOD) are investigated using observations and the Community Earth System Model Large Ensemble (CESM-LE) project in this study. The positive STIOD is characterized as cold SST anomalies over the tropical southeastern Indian Ocean (SEIO) and warm SST anomalies over the southcentral Indian Ocean (SCIO), which peak in boreal summer. It is suggested that the intensity of interannual variability in the STIOD experienced prominent interdecadal changes from 1970 to the present. The STIOD was relatively weak before the late 1980s, while it is enhanced significantly during the late 1980s to early-2000s and displayed some decrease in the intensity after the early-2000s. As an important generation mechanism, changes in the strengths of the Bjerknes feedback between the SCIO and SEIO mainly contribute to the variations of the STIOD intensity. The changes in Bjerknes feedback are associated with the variations in climatological mean states over the tropical Indian Ocean. The warmer climatological SST strengthens the efficiency of the SEIO SST in driving wind. On the other hand, the combined effects of the Indonesian Throughflow and surface climatological zonal winds alter the mean thermocline depth over the SEIO, contributing to the variations in the relationship between the thermocline depth and SST anomalies in situ. Two sets of historical and RCP8.5 simulations from CESM1-LE with 35 ensemble members are analyzed to confirm the roles of mean state changes on the intensity of interannual variability of STIOD.
英文关键词	Southern tropical Indian Ocean dipole mode; Interdecadal changes; Bjerknes feedback; Climatological mean state
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001153910800001
来源期刊	CLIMATE DYNAMICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/299510
作者单位	Sun Yat Sen University; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai); Chinese Academy of Sciences; South China Sea Institute of Oceanology, CAS; Chinese Academy of Sciences; South China Sea Institute of Oceanology, CAS; Chinese Academy of Sciences; Institute of Deep-Sea Science & Engineering, CAS; George Mason University; George Mason University; Center for Ocean Land Atmosphere Studies
推荐引用方式 GB/T 7714	Zhang, Guangli,Wang, Xin,Xie, Qiang,et al. Attributing interdecadal variations of southern tropical Indian Ocean dipole mode to rhythms of Bjerknes feedback intensity[J],2024.
APA	Zhang, Guangli.,Wang, Xin.,Xie, Qiang.,Huang, Bohua.,Chen, Jiepeng.,...&Wang, Dongxiao.(2024).Attributing interdecadal variations of southern tropical Indian Ocean dipole mode to rhythms of Bjerknes feedback intensity.CLIMATE DYNAMICS.
MLA	Zhang, Guangli,et al."Attributing interdecadal variations of southern tropical Indian Ocean dipole mode to rhythms of Bjerknes feedback intensity".CLIMATE DYNAMICS (2024).