大气科学2018，Vol.42Issue(1)：1-15,15.DOI:10.3878/j.issn.1006-9895.1705.16261
近海水汽初值和对流影响一次华南前汛期沿海强降水对流系统发展过程的机理研究
Influence of Offshore Initial Moisture Field and Convection on the Development of Coastal Convection in a Heavy Rainfall Event over South China during the Pre-summer Rainy Season
摘要
Abstract
This paper utilizes observation data from the SCMREX (Southern China Monsoon Rainfall Experiment) and numerical sensitive simulation experiments to investigate the influence of moisture amount and convection development over the northern South China Sea on MCS (Mesoscale Convective System) of a heavy rainfall event in coastal South China on May 8,2014.Intensive soundings and wind profiler data reveal that there existed a convergence region formed by the southwesterly and easterly jet in the Pearl River delta,which provided a favorable condition for the development of convection.When the initial relative humidity was increased or decreased in the offshore area,or latent heat released from the cumulus and microphysical processes were turned off,significant effects could be found on the intensity and movement of convection in the coastal area of Guangdong owing to the adjustment of temperature and wind fields.In particular,when increasing offshore initial humidity,prosperous sea convection modified the circulation in the entire simulation area,and suppressed the development of convection over the land.Moreover,if latent heat from cumulus and microphysical processes were turned off,the low-level jet could reach further north,and the convective system moved to the northeast in the later stage.These experiments indicate that the offshore initial moisture field and convection are indeed important for precipitation forecast in the coastal area.Therefore it is necessary to enhance offshore observation and data assimilation method in the future.关键词
中尺度对流系统/低空急流/敏感试验/对流潜热/降雨预报Key words
Mesoscale Convective System (MCS)/Low-level jets/Sensitivity experiment/Latent heat/Rainfall forecast分类
天文与地球科学引用本文复制引用
鲁蓉,孙建华,傅慎明..近海水汽初值和对流影响一次华南前汛期沿海强降水对流系统发展过程的机理研究[J].大气科学,2018,42(1):1-15,15.基金项目
国家自然科学基金项目41675045,灾害天气国家重点实验室基金项目2016LASW-B05 National Natural Science Foundation of China (Grant 41675045),Fund of National Key Laboratory of Disaster Weather (Grant 2016LASW-B05) （Grant 41675045）
