气候变化领域集成服务门户(CCPortal): Radiative impacts of low-level clouds on the summertime subtropical high in the South Indian ocean simulated in a coupled general circulation model

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DOI	10.1175/JCLI-D-20-0709.1
	Radiative impacts of low-level clouds on the summertime subtropical high in the South Indian ocean simulated in a coupled general circulation model
	Miyamoto A.; Nakamura H.; Miyasaka T.; Kosaka Y.
发表日期	2021
ISSN	08948755
起始页码	3991
结束页码	4007
卷号	34 期号:10
英文摘要	Over the south Indian Ocean, the coupled system of the subtropical Mascarene high and low-level clouds exhibits marked seasonality. To investigate this seasonality, the present study assesses radiative impacts of low-level clouds on the summertime Mascarene high with a coupled general circulation model. Comparison between a fully coupled control simulation and a ‘‘no-low-cloud simulation,’’ where the radiative effects of low-level clouds are artificially turned off, demonstrates that they act to reinforce the Mascarene high. Their impacts are so significant that the summertime Mascarene high almost disappears in the no-low-cloud experiment, suggesting their essential role in the existence of the summertime Mascarene high. As the primary mechanism, lowered sea surface temperature by the cloud albedo effect suppresses deep convective precipitation, inducing a Matsuno–Gill type response that reinforces the high, as verified through an atmospheric dynamical model diagnosis. Associated reduction of high-top clouds, as well as increased low-level clouds, augments in-atmosphere radiative cooling, which further reinforces the high. The present study reveals that low-level clouds constitute a tight positive feedback system with the subtropical high via sea surface temperature over the summertime south Indian Ocean. © 2021 American Meteorological Society.
英文关键词	Anticyclones; Atmosphere-ocean interaction; Clouds; Indian Ocean; Subtropics
语种	英语
scopus关键词	Atmospheric temperature; Feedback; Oceanography; Radiative Cooling; Submarine geophysics; Surface properties; Surface waters; Tropics; Convective precipitation; Coupled general circulation models; Positive feedback systems; Primary mechanism; Radiative effects; Sea surface temperature (SST); South Indian Ocean; Summertime subtropical highs; Precipitation (meteorology)
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178577
作者单位	Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; Japan Meteorological Business Support Center, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
推荐引用方式 GB/T 7714	Miyamoto A.,Nakamura H.,Miyasaka T.,et al. Radiative impacts of low-level clouds on the summertime subtropical high in the South Indian ocean simulated in a coupled general circulation model[J],2021,34(10).
APA	Miyamoto A.,Nakamura H.,Miyasaka T.,&Kosaka Y..(2021).Radiative impacts of low-level clouds on the summertime subtropical high in the South Indian ocean simulated in a coupled general circulation model.Journal of Climate,34(10).
MLA	Miyamoto A.,et al."Radiative impacts of low-level clouds on the summertime subtropical high in the South Indian ocean simulated in a coupled general circulation model".Journal of Climate 34.10(2021).