气候变化领域集成服务门户(CCPortal): Diurnal cycle of coastal convection in the south china sea region and modulation by the BSISO

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DOI	10.1175/JCLI-D-20-0308.1
	Diurnal cycle of coastal convection in the south china sea region and modulation by the BSISO
	Xu W.; Rutledge S.A.; Chudler K.
发表日期	2021
ISSN	08948755
起始页码	4297
结束页码	4314
卷号	34 期号:11
英文摘要	Using 17-yr spaceborne precipitation radar measurements, this study investigates how diurnal cycles of rainfall and convective characteristics over the South China Sea region are modulated by the boreal summer intraseasonal oscillation (BSISO). Generally, diurnal cycles change significantly between suppressed and active BSISO periods. Over the Philippines and Indochina, where the low-level monsoon flows impinge on coast lines, diurnal cycles of rainfall and many convective properties are enhanced during suppressed periods. During active periods, diurnal variation of convection is still significant over land but diminishes over water. Also, afternoon peaks of rainfall and MCS populations over land are obviously extended in active periods, mainly through the enhancement of stratiform precipitation. Over Borneo, where the prevailing low-level winds are parallel to coasts, diurnal cycles (both onshore and offshore) are actually stronger during active periods. Radar profiles also demonstrate a pronounced nocturnal offshore propagation of deep convection over western Borneo in active periods. During suppressed periods, coastal afternoon convection over Borneo is reduced, and peak convection occurs over the mountains until the convective suppression is overcome in the late afternoon or evening. A major portion (.70%) of the total precipitation over the Philippines and Indochina during suppressed periods falls from afternoon isolated to medium-sized systems (,10 000 km2), but more than 70% of the active BSISO rainfall is contributed by nocturnal (after 1800 LT) broad precipitation systems (.10 000 km2). However, offshore total precipitation is dominated by large precipitation systems (.10 000 km2) regardless of BSISO phases and regions. © 2021 American Meteorological Society.
英文关键词	Convection; Diurnal effects; Intraseasonal variability; Madden-Julian oscillation; Mesoscale systems; Precipitation
语种	英语
scopus关键词	Offshore oil well production; Radar; Rain; Boreal summer intraseasonal oscillation; Convective properties; Diurnal variation; Low-level winds; Precipitation radar; Precipitation systems; Stratiform precipitation; Total precipitation; Radar measurement
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/178531
作者单位	Sun Yat-Sen University, Zhuhai, China; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Guangzhou, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Xu W.,Rutledge S.A.,Chudler K.. Diurnal cycle of coastal convection in the south china sea region and modulation by the BSISO[J],2021,34(11).
APA	Xu W.,Rutledge S.A.,&Chudler K..(2021).Diurnal cycle of coastal convection in the south china sea region and modulation by the BSISO.Journal of Climate,34(11).
MLA	Xu W.,et al."Diurnal cycle of coastal convection in the south china sea region and modulation by the BSISO".Journal of Climate 34.11(2021).