气候变化领域集成服务门户(CCPortal): Genesis and Trends in Marine Heatwaves Over the Tropical Indian Ocean and Their Interaction With the Indian Summer Monsoon

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DOI	10.1029/2021JC017427
	Genesis and Trends in Marine Heatwaves Over the Tropical Indian Ocean and Their Interaction With the Indian Summer Monsoon
	Saranya, J. S.; Roxy, M. K.; Dasgupta, Panini; Anand, Ajay
发表日期	2022
ISSN	2169-9275
EISSN	2169-9291
卷号	127 期号:2
英文摘要	Marine heatwaves (MHWs) are extreme oceanic warm water events (above 90th percentile threshold) that significantly impact the marine environment. Recent studies have explored the genesis and impacts of MHWs in the global oceans though they are least understood in the tropical Indian Ocean. Here we investigate the genesis and trend of MHWs in the Indian Ocean during 1982-2018 and their role in modulating the Indian summer monsoon. We find that the rapid warming in the Indian Ocean plays a critical role in increasing the number of MHWs. Meanwhile, the El Nino has a prominent influence on the occurrence of MHWs during the monsoon. The Indian Ocean warming and the El Nino variability have synergistically resulted in some of the strongest and long-lasting MHWs in the Indian Ocean. The western Indian Ocean region experienced the largest increase in MHWs at a rate of 1.2-1.5 events per decade, followed by the north Bay of Bengal at a rate of 0.4-0.5 events per decade. Locally, the MHWs are induced by increased solar radiation, relaxation of winds, and reduced evaporative cooling. In the western Indian Ocean, the decreased winds further restrict the heat transport by ocean currents from the near-equatorial regions toward the north. Our analysis indicates that the MHWs in the western Indian Ocean and the north Bay of Bengal lead to a reduction in monsoon rainfall over the central Indian subcontinent. On the other hand, there is an enhancement of monsoon rainfall over southwest India due to the MHWs in the Bay of Bengal.
英文关键词	marine heatwave; Indian Ocean; monsoon; ocean warming; climate change; global warming
语种	英语
WOS研究方向	Oceanography
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000765614000028
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/281073
作者单位	Ministry of Earth Sciences (MoES) - India; Indian Institute of Tropical Meteorology (IITM); Centre for Climate Change Research - India; Andhra University; Cochin University Science & Technology
推荐引用方式 GB/T 7714	Saranya, J. S.,Roxy, M. K.,Dasgupta, Panini,et al. Genesis and Trends in Marine Heatwaves Over the Tropical Indian Ocean and Their Interaction With the Indian Summer Monsoon[J],2022,127(2).
APA	Saranya, J. S.,Roxy, M. K.,Dasgupta, Panini,&Anand, Ajay.(2022).Genesis and Trends in Marine Heatwaves Over the Tropical Indian Ocean and Their Interaction With the Indian Summer Monsoon.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,127(2).
MLA	Saranya, J. S.,et al."Genesis and Trends in Marine Heatwaves Over the Tropical Indian Ocean and Their Interaction With the Indian Summer Monsoon".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 127.2(2022).