海盐核对华南沿海一次暖区暴雨的影响  

Effect of sea salt aerosols on a warm-sector heavy rainfall event over coastal Southern China

作　　者：罗青 陈子健 林文实 蒋宝林 曹琪敏 李芳洲 LUO Qing;CHEN Zijian;LIN Wenshi;JIANG Baolin;CAO Qimin;LI Fangzhou(School of Atmospheric Sciences/Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies,Sun Yat-sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;School of Geography and Tourism,Huizhou University,Huizhou 516007,China)

机构地区：[1]中山大学大气科学学院/广东省气候变化与自然灾害研究重点实验室,广东珠海519082 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [3]惠州学院地理与旅游学院,广东惠州516007

出　　处：《中山大学学报（自然科学版）（中英文）》2023年第2期123-136,共14页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：Supported by National Natural Science Foundation of China(41875168)。

摘　　要：采用中尺度数值天气模式WRF-Chem 4.1.2,模拟了2014年在华南沿海地区发生的一次暖区强降水事件。通过进行3个不同海盐核排放强度(CTL,LOW,HIGH)试验,从降水落区、水成物分布、微物理过程以及潜热释放方面,探讨了海盐气溶胶浓度对暖区暴雨的影响。研究结果表明,海盐核浓度对降水落区有一定的影响,低海盐核排放下的降水区域更分散,而高海盐核排放下的降水区域更集中。低(高)海盐核排放情况下,降水中的云凝结核浓度减少(增加)、雨水和霰的混合比增加(减少)、云微物理过程尤其是云水自动转化成雨水及云水被雨水收集过程增强(减弱)、潜热释放增加(减小)以及上升运动增强(减弱),导致累计降水增多(减小)及降雨率增大(减小)。This study used the Weather Research and Forecasting model coupled with Chemistry(WRFChem)version 4.1.2 to simulate a warm-sector heavy rainfall(WSHR)event that occurred over coastal Southern China in 2014.To investigate the effects of the concentration of sea salt aerosols(SSA)on the development of WSHR,different levels of SSA emission were incorporated in three separate experi‐ments(CTL,LOW,and HIGH).The distribution of precipitation and hydrometeors,the microphysical processes,and the release of latent heat resulting from the rainfall in all three simulations were ana‐lyzed.Results show that SSA mass concentration can affect the rainfall area:the LOW experiment shows dispersed rainfall,whereas the HIGH experiment presents concentrated rainfall.Under the situa‐tion of low(high)SSA emission:the concentration of cloud condensation nuclei during rainfall de‐creases(increases),the mixing ratio of rain and graupel increases(decreases),and microphysical pro‐cesses,particularly the automatic conversion of cloud water into rainwater and accretion of cloud water by rain,are enhanced(weakened),more(less)latent heat is released,and the updrafts are enhanced(weakened);these result in an increase(decrease)of accumulated precipitation and rain rate.

关 键 词：海盐核 暖区暴雨 微物理效应 WRF-Chem模式 

分 类 号：P401[天文地球—大气物理学与大气环境]