气候变化领域集成服务门户(CCPortal): Rain and cloud perspectives on the seasonal cycle over the western equatorial Indian Ocean

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DOI	10.1175/JCLI-D-19-0080.1
	Rain and cloud perspectives on the seasonal cycle over the western equatorial Indian Ocean
	King M.J.; Jakob C.
发表日期	2020
ISSN	0894-8755
起始页码	925
结束页码	940
卷号	33 期号:3
英文摘要	Convection over the western equatorial Indian Ocean (WEIO) is strongly linked to precipitation over Africa and Australia but is poorly represented in current climate models, and its observed seasonal cycle is poorly understood. This study investigates the seasonal cycle of convection in the WEIO through rainfall and cloud measurements. Rainfall shows a single annual peak in early austral summer, but cloud proxies identify convective activity maxima in both boreal and austral summer. These diverging measures of convection during boreal summer are indicative of a reduction in the intensity of precipitation associated with a given cloud regime or cloud-top height during this time of year but an increase in the overall occurrence of high-top clouds and convectively active cloud regimes. The change in precipitation intensity associated with regimes is found to explain most of the changes in total precipitation during the period from May to November, whereas changes in the occurrence of convective regimes explains most of the changes throughout the rest of the year. The reduction in precipitation intensities associated with cloud regimes over the WEIO during boreal summer appears to be related to large-scale monsoon circulations, which suppress convection through forcing air descent in the midtroposphere and increase the apparent occurrence of convectively active cloud regimes through the advection of high-level cloud from monsoon-active areas toward the WEIO region. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Atmospheric thermodynamics; Climate models; Cloud top heights; Convective activity; Equatorial Indian Ocean; High level clouds; High-top clouds; Monsoon circulations; Precipitation intensity; Total precipitation; Rain; atmospheric convection; climate modeling; cloud cover; monsoon; precipitation (climatology); precipitation intensity; rainfall; seasonal variation; Indian Ocean; Indian Ocean (Equatorial)
语种	英语
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/171461
作者单位	School of Earth, Atmosphere and Environment, ARC Centre of Excellence for Climate Systems Science, Monash University, Clayton, Australia
推荐引用方式 GB/T 7714	King M.J.,Jakob C.. Rain and cloud perspectives on the seasonal cycle over the western equatorial Indian Ocean[J],2020,33(3).
APA	King M.J.,&Jakob C..(2020).Rain and cloud perspectives on the seasonal cycle over the western equatorial Indian Ocean.Journal of Climate,33(3).
MLA	King M.J.,et al."Rain and cloud perspectives on the seasonal cycle over the western equatorial Indian Ocean".Journal of Climate 33.3(2020).