气候变化领域集成服务门户(CCPortal): The Synoptic Impacts on the Convection Initiation of a Warm-Sector Heavy Rainfall Event Over Coastal South China Prior to the Monsoon Onset: A Numerical Modeling Study

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DOI	10.1029/2020JD034335
	The Synoptic Impacts on the Convection Initiation of a Warm-Sector Heavy Rainfall Event Over Coastal South China Prior to the Monsoon Onset: A Numerical Modeling Study
	Bao X.; Luo Y.; Gao X.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:14
英文摘要	A series of convection-permitting numerical experiments using the Weather Research and Forecasting Model with different model configurations are performed to investigate physical mechanisms governing convection initiation (CI) at the coast of South China (SC) during a warm-sector heavy rainfall event occurred before the South China Sea (SCS) monsoon onset. The simulation results are more sensitive to initial state from the different reanalysis products than the microphysics schemes, horizontal resolutions, initialization time, and lateral boundary conditions with the variation examined. It is found that the speeds of easterly to southeasterly winds in the boundary layer (BL) over northern SCS determine the strength of horizontal convergence of the warm and moist airflows arriving at the coast. The mid-tropospheric divergence over the west coastal areas of SC and its southwest upstream impact vertical motion of the mid-to-lower tropospheric southwesterly airflows when approaching the coast. Differences in such features of upstream airflows in the experiments lead to distinct temporal evolutions of BL dynamic lifting and temperature stratification in the mid-to-lower levels at the CI location, thus the level of free convection and convective available potential energy. The modeling evidence presented shows that the synoptic dynamic and thermodynamic characteristics of the upstream airflows in BL and mid-to-lower troposphere, with local modulation by the coastal mountains, play important roles in determining the time and location of CI, and the distribution and amount of rainfall. Studies on more cases are needed to gain more general and robust conclusions about physical mechanism governing the warm-sector coastal CI. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Coastal South China; convection initiation; numerical simulation; synoptic characteristics; warm-sector heavy rainfall
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/237123
作者单位	State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China; Department of Earth Systems Science, Tsinghua University, Beijing, China
推荐引用方式 GB/T 7714	Bao X.,Luo Y.,Gao X.. The Synoptic Impacts on the Convection Initiation of a Warm-Sector Heavy Rainfall Event Over Coastal South China Prior to the Monsoon Onset: A Numerical Modeling Study[J],2021,126(14).
APA	Bao X.,Luo Y.,&Gao X..(2021).The Synoptic Impacts on the Convection Initiation of a Warm-Sector Heavy Rainfall Event Over Coastal South China Prior to the Monsoon Onset: A Numerical Modeling Study.Journal of Geophysical Research: Atmospheres,126(14).
MLA	Bao X.,et al."The Synoptic Impacts on the Convection Initiation of a Warm-Sector Heavy Rainfall Event Over Coastal South China Prior to the Monsoon Onset: A Numerical Modeling Study".Journal of Geophysical Research: Atmospheres 126.14(2021).