气候变化领域集成服务门户(CCPortal): Simulation of Central Indian Ocean Mode in S2S Models

CCPortal

DOI	10.1029/2020JD033550
	Simulation of Central Indian Ocean Mode in S2S Models
	Qin J.; Zhou L.; Li B.; Murtugudde R.
发表日期	2020
ISSN	2169897X
卷号	125 期号:21
英文摘要	Simulation of monsoon intraseasonal oscillations (MISO) during the Indian summer monsoon (ISM) is a grand scientific challenge. The Subseasonal-to-Seasonal (S2S) prediction project provides a unique way to examine the key dynamics of MISO. Recently, a Central Indian Ocean (CIO) mode was proposed as an intrinsic climate mode over the Indian Ocean, and it has a close relation with MISO during the ISM. In this study, the simulations of the CIO mode events in S2S models are examined. The results confirm that a better rendition of the CIO mode in S2S models tends to result in a better simulation of northward propagating MISO and leads to stronger subseasonal rainfall during the ISM. The positive CIO mode cases are classified into well-simulated and poorly simulated groups. It is shown that the barotropic energy conversion due to the meridional shear of background zonal winds ((Formula presented.)) enhances the kinetic energy at subseasonal timescales during the CIO mode in the well-simulated group, which also agrees with observations. As a result, the enhanced meridional wind anomalies transport moisture from the tropics to the subtropics and reinforce midtropospheric moisture loading in the subtropics, which nourishes the northward propagating MISO. Therefore, a better simulation of (Formula presented.) and moisture transport by subseasonal meridional wind anomalies are required to improve the CIO mode simulation, which is expected to benefit the simulation and prediction of MISO during the ISM. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Central Indian Ocean mode; Indian summer monsoon; intraseasonal variability; subseasonal to seasonal; zonal wind gradient
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185662
作者单位	School of Oceanography, Shanghai Jiao Tong University, Shanghai, China; College of Oceanography, Hohai University, Nanjing, China; Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States
推荐引用方式 GB/T 7714	Qin J.,Zhou L.,Li B.,et al. Simulation of Central Indian Ocean Mode in S2S Models[J],2020,125(21).
APA	Qin J.,Zhou L.,Li B.,&Murtugudde R..(2020).Simulation of Central Indian Ocean Mode in S2S Models.Journal of Geophysical Research: Atmospheres,125(21).
MLA	Qin J.,et al."Simulation of Central Indian Ocean Mode in S2S Models".Journal of Geophysical Research: Atmospheres 125.21(2020).