气候变化领域集成服务门户(CCPortal): Simulation of interannual relationship between the Atlantic zonal mode and Indian summer monsoon in CFSv2

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DOI	10.1007/s00382-021-05712-0
	Simulation of interannual relationship between the Atlantic zonal mode and Indian summer monsoon in CFSv2
	Pottapinjara V.; Roxy M.K.; Girishkumar M.S.; Ashok K.; Joseph S.; Ravichandran M.; Murtugudde R.
发表日期	2021
ISSN	0930-7575
起始页码	345
结束页码	360
英文摘要	Recent studies have shown that the Atlantic zonal mode (AZM) can significantly influence the Indian summer monsoon (ISM). In an earlier study, we proposed that AZM influence propagates in tropospheric temperature as Kelvin wave-like features to the east to reach the Indian Ocean and influences the monsoon by modulating the mid-tropospheric land-sea thermal gradient and thereby the seasonal mean flow. The changes thus induced in the mean flow were shown to affect the monsoon depressions in the Bay of Bengal and rainfall over India. In the present study, we use the Coupled Forecast System version 2, which is utilized for seasonal prediction of ISM in India, to examine how well the model simulates this AZM-monsoon link. In the sensitivity experiment, a warm AZM SST anomaly is added over the tropical Atlantic in the boreal summer and the ISM response is studied. We find that the model simulates the important aspects of the AZM-monsoon link. The model also simulates a known dynamics-based mechanism wherein a warm AZM SST anomaly produces a Matsuno-Gill type response, which in turn induces a sinking motion over India causing a reduction in rainfall. However, some finer details of these mechanisms are not simulated due to mean state biases in the tropical Atlantic in the model, a problem common to many coupled models. Our study highlights the need for the improvement of mean state of model in the tropical Atlantic to better capture the AZM-ISM relationship which will ultimately improve the monsoon forecasts issued using this model. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	CFSv2; Coupled model biases; Indian summer monsoon; Interannual variability; Teleconnection; Tropical Atlantic
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/183512
作者单位	Indian National Centre for Ocean Information Services, Ministry of Earth Sciences, Hyderabad, India; Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India; Centre for Earth, Ocean and Atmospheric Sciences, University of Hyderabad, Hyderabad, India; National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Goa, India; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States
推荐引用方式 GB/T 7714	Pottapinjara V.,Roxy M.K.,Girishkumar M.S.,et al. Simulation of interannual relationship between the Atlantic zonal mode and Indian summer monsoon in CFSv2[J],2021.
APA	Pottapinjara V..,Roxy M.K..,Girishkumar M.S..,Ashok K..,Joseph S..,...&Murtugudde R..(2021).Simulation of interannual relationship between the Atlantic zonal mode and Indian summer monsoon in CFSv2.Climate Dynamics.
MLA	Pottapinjara V.,et al."Simulation of interannual relationship between the Atlantic zonal mode and Indian summer monsoon in CFSv2".Climate Dynamics (2021).