Differences in Precipitation and Related Wind Dynamics and Moisture and Heat Features in Separate Areas of the South China Sea before and after Summer Monsoon Onset  

作　　者：Chunyan ZHANG Donghai WANG Kaifeng ZHANG Wanwen HE Yanping ZHENG Yan XU 

机构地区：[1]Guangdong Meteorological Data Center,Guangdong Meteorological Bureau,Guangzhou 510640,China [2]School of Atmospheric Sciences,Sun Yat-sen University,Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies,Key Laboratory of Tropical Atmosphere-Ocean System,Ministry of Education,Zhuhai 519082,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China [4]National Observation and Research Station of Coastal Ecological Environments in Macao,Macao Environmental Research Institute,Macao University of Science and Technology,Macao SAR 999078,China [5]Foshan Meteorological Service,Foshan 528000,China [6]Ningjiang District Meteorological Bureau,Songyuan 138000,China

出　　处：《Advances in Atmospheric Sciences》2024年第8期1643-1660,共18页大气科学进展（英文版）

基　　金：supported by a Guangdong Major Project of Basic and Applied Basic Research (Grant No.2020B0301030004);the Collaborative Observation and Multisource Real-time Data Fusion and Analysis Technology & Innovation team (Grant No.GRMCTD202103);the Foshan Special Project on Science and Technology in Social Field (Grant No.2120001008761)。

摘　　要：Using surface and balloon-sounding measurements, satellite retrievals, and ERA5 reanalysis during 2011–20, this study compares the precipitation and related wind dynamics, moisture and heat features in different areas of the South China Sea(SCS) before and after SCS summer monsoon onset(SCSSMO). The rainy sea around Dongsha(hereafter simply referred to as Dongsha) near the north coast, and the rainless sea around Xisha(hereafter simply referred to as Xisha) in the western SCS, are selected as two typical research subregions. It is found that Dongsha, rather than Xisha, has an earlier and greater increase in precipitation after SCSSMO under the combined effect of strong low-level southwesterly winds, coastal terrain blocking and lifting, and northern cold air. When the 950-h Pa southwesterly winds enhance and advance northward, accompanied by strengthened moisture flux, there is a strong convergence of wind and moisture in Dongsha due to a sudden deceleration and rear-end collision of wind by coastal terrain blocking. Moist and warm advection over Dongsha enhances early and deepens up to 200 h Pa in association with the strengthened upward motion after SCSSMO, thereby providing ample moisture and heat to form strong precipitation. However, when the 950-h Pa southwesterly winds weaken and retreat southward, Xisha is located in a wind-break area where strong convergence and upward motion centers move in. The vertical moistening and heating by advection in Xisha enhance later and appear far weaker compared to that in Dongsha, consistent with later and weaker precipitation.

关 键 词：Dongsha Xisha South China Sea summer monsoon onset PRECIPITATION wind dynamics MOISTURE HEAT 

分 类 号：P732[天文地球—海洋科学]