气候变化领域集成服务门户(CCPortal): Anomalies of Precipitation over China on Days with Tropical Cyclone Activity over the Bay of Bengal: Role of Moisture Transport

CCPortal

DOI	10.1007/s13351-024-3094-1
	Anomalies of Precipitation over China on Days with Tropical Cyclone Activity over the Bay of Bengal: Role of Moisture Transport
	Wei, Na; Li, Ying; Fan, Xiaoting
发表日期	2024
ISSN	2095-6037
EISSN	2198-0934
起始页码	38
结束页码	2
卷号	38 期号:2
英文摘要	Tropical cyclones over the Bay of Bengal (BoBTC) affect the precipitation over China, with distinct seasonal and daily variabilities. This study quantitatively examines the daily standardized precipitation anomalies (SPAs) over China on the days with BoBTC activities (storm-days) and related circulations, based on rainfall measurements at surface meteorological stations and ECMWF reanalysis data on a 0.25 degrees x 0.25 degrees resolution during 1979-2019. Significant positive SPA is found over the stations in the two adjacent regions around BoB (Southwest China in May/November and southern Tibetan Plateau in October) and three distant regions (Southeast China and the northeastern boundary of the Qinghai-Tibet Plateau in May, and central North China in October). The SPA distributions are remarkably consistent with the integrated water vapor transport (IVT) anomalies. Enhanced IVT is found associated with the interaction between southwesterly (southerly) of the BoBTC circulation and low-level monsoonal flow in May (midlevel westerly in winter months). The probabilities of extreme precipitation (EP) occurrences over the above regions all increase on storm-days. For adjacent regions, EP is significantly correlated with the northward IVT anomalies to the east of BoBTC circulation, which strengthen the water vapor input through the southern border. Such IVT anomalies are stronger in May, benefited by the deep monsoonal southwesterlies than those in November. For distant regions, EP is more closely related to the IVT anomaly extending back from BoB. Enhanced moisture from BoB concentrates along a local low-level convergence line over Southeast China, being further facilitated by coexistence of the BoBTC depression and midlevel westerly trough in midlatitudes. Our results highlight the interactions between BoBTCs and local weather systems that influence the general precipitation anomalies and occurrence of EP over China, especially over distant regions.
英文关键词	tropical cyclone; Bay of Bengal; precipitation anomaly; moisture transport
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001220795000009
来源期刊	JOURNAL OF METEOROLOGICAL RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302452
作者单位	China Meteorological Administration; Chinese Academy of Meteorological Sciences (CAMS); Fudan University
推荐引用方式 GB/T 7714	Wei, Na,Li, Ying,Fan, Xiaoting. Anomalies of Precipitation over China on Days with Tropical Cyclone Activity over the Bay of Bengal: Role of Moisture Transport[J],2024,38(2).
APA	Wei, Na,Li, Ying,&Fan, Xiaoting.(2024).Anomalies of Precipitation over China on Days with Tropical Cyclone Activity over the Bay of Bengal: Role of Moisture Transport.JOURNAL OF METEOROLOGICAL RESEARCH,38(2).
MLA	Wei, Na,et al."Anomalies of Precipitation over China on Days with Tropical Cyclone Activity over the Bay of Bengal: Role of Moisture Transport".JOURNAL OF METEOROLOGICAL RESEARCH 38.2(2024).