气候变化领域集成服务门户(CCPortal): Thermocline Warming Induced Extreme Indian Ocean Dipole in 2019

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DOI	10.1029/2020GL090079
	Thermocline Warming Induced Extreme Indian Ocean Dipole in 2019
	Du Y.; Zhang Y.; Zhang L.-Y.; Tozuka T.; Ng B.; Cai W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:18
英文摘要	The 2019 positive Indian Ocean Dipole (IOD) was the strongest event since the 1960s which developed independently without coinciding El Niño. The dynamics is not fully understood. Here we show that in March–May, westward propagating oceanic Rossby waves, a remnant consequence of the weak 2018 Pacific warm condition, led to anomalous sea surface temperature warming in the southwest tropical Indian Ocean (TIO), inducing deep convection and anomalous easterly winds along the equator, which triggered the initial cooling in the east. In June–August, the easterly wind anomalies continued to evolve through ocean-atmosphere coupling involving Bjerknes feedback and equatorial nonlinear ocean advection, until its maturity in September–November. This study clarifies the contribution of oceanic Rossby waves in the south TIO in different dynamic settings and reveals a new triggering mechanism for extreme IOD events that will help to understand IOD diversity. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Mechanical waves; Surface waters; Bjerknes feedback; Dynamic settings; Indian Ocean dipole; Indian ocean dipoles; Ocean atmosphere; Sea surface temperature (SST); Triggering mechanism; Tropical Indian ocean; Ocean currents; atmosphere-ocean coupling; easterly wave; El Nino; extreme event; global warming; Indian Ocean Dipole; induced response; ocean wave; Rossby wave; sea surface temperature; thermocline; wave propagation; Indian Ocean; Indian Ocean (Tropical); Pacific Ocean
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169690
作者单位	State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, CAS, Guangzhou, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China; Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan; Centre for Southern Hemisphere Oceans Research (CSHOR), CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Key Laboratory of Physical Oceanography, Institute for Advanced Ocean Studies, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
推荐引用方式 GB/T 7714	Du Y.,Zhang Y.,Zhang L.-Y.,et al. Thermocline Warming Induced Extreme Indian Ocean Dipole in 2019[J],2020,47(18).
APA	Du Y.,Zhang Y.,Zhang L.-Y.,Tozuka T.,Ng B.,&Cai W..(2020).Thermocline Warming Induced Extreme Indian Ocean Dipole in 2019.Geophysical Research Letters,47(18).
MLA	Du Y.,et al."Thermocline Warming Induced Extreme Indian Ocean Dipole in 2019".Geophysical Research Letters 47.18(2020).