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气象:2023,49(3):279-290
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基于雷达观测的华南夏季降水类型日变化的时空分布特征
唐菁,陈生,李峙,韦春霞
(南宁师范大学北部湾环境演变与资源利用教育部重点实验室,南宁 530001; 南宁师范大学地理科学与规划学院,南宁 530001;中国科学院西北生态环境资源研究院黑河遥感站,兰州 730000; 中国科学院西北生态环境资源研究院甘肃省遥感重点实验室,兰州 730000;广西壮族自治区气象科学研究所,南宁 530022)
Spatio-Temporal Distribution Characteristics of Diurnal Variation of Summer Rainfall in South China Based on Radar Observation
TANG Jing,CHEN Sheng,LI Zhi,WEI Chunxia
(Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education, Nanning Normal University, Nanning 530001; School of Geographic Sciences and Planning, Nanning Normal University, Nanning 530001;Heihe Remote Sensing Experimental Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000; Key Laboratory of Remote Sensing of Gansu Province, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000; Guangxi Institute of Meteorological Sciences, Nanning 530022)
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投稿时间:2021-11-14    修订日期:2022-06-10
中文摘要: 新一代多普勒天气雷达(CINRAD)具有高时空分辨率的特点,可以精细观测降水强度变化过程以及降水区域的实时移动,能有效监测灾害性天气事件。利用华南地区的多普勒天气雷达组网拼图资料,系统研究分析2017—2020年间夏季降水类型时空分布特征。研究表明:华南夏季出现的降水多为层云降水,大部分地区出现频次占比超过85%,而对流降水出现频次仅占14%左右。广东的雷达反射率峰值和对流降水频次均高于广西和海南。华南的雷达反射率峰值和降水频次显示出强烈的日变化特征,并存在显著的区域性差异。雷达反射率峰值与对流降水空间分布大致相似,沿海地区降水频次高于内陆地区;而层云降水在内陆地区的发生频次高于沿海地区。华南层云降水频次多集中在夜间,并在上午达到峰值;反射率峰值和对流降水多集中在日间,高值区随着时间变化从西部沿海不断向内陆和东部沿海移动扩张,并在午后和夜间之间达到峰值。对流降水日变化在沿海和内陆地区呈现不同的双峰模式,西部沿海上午出现主峰值,次峰值出现在午后晚些时候;而内陆的粤中地区上午峰值明显低于午后峰值。
Abstract:The Chinese new generation of Doppler weather radar (CINRAD) has the advantages of high spatio-temporal resolution. It can observe the change process of precipitation intensity and the real-time movement of precipitation area in detail, and also can effectively monitor disastrous weather events. In this paper, the spatio-temporal distribution characteristics of summer precipitation in South China are investigated based on Doppler multiradar mosaic data in South China from 2017 to 2020. The results show that the frequency of summer precipitation in South China is dominated by stratiform precipitation. In most parts of South China, the frequency of stratiform precipitation is more than 85%, while the frequency of convective precipitation only accounts for about 14%. The peak reflectivity and the frequency of convective precipitation in Guangdong are higher than those in Guangxi and Hainan. Both the peak reflectivity and precipitation frequency show strong diurnal variation with local solar radiation, and also exhibits discernible regional differences. The reflectivity peak is roughly similar to the spatial distribution of convective precipitation, and the frequencies along the coast are higher than those in the inland region. Stratiform precipitation occurs most frequently in the inland region than along the coast. The frequency of stratiform precipitation is mostly concentrated at night with peaks seen in the morning. The peak reflectivity and convective precipitation are mostly concentrated in the daytime, the high-value region expands from the western coast to the inland and eastern coast as time changes, reaching the peak between afternoon and night. The diurnal variation of convective precipitation exhibits different bimodal patterns in coastal and inland region. A major peak appears in the morning and a secondary peak in the late afternoon, and the morning peak in central Guangdong is significantly lower than the afternoon peak.
文章编号:     中图分类号:P426,P468    文献标志码:
基金项目:国家自然科学基金项目(41875182)、北部湾环境演变与资源利用教育部重点实验室开放基金(NNNU-KLOP-K2103)和广西重点研发计划(桂科AB22035016、桂科AB22080104)共同资助
引用文本:
唐菁,陈生,李峙,韦春霞,2023.基于雷达观测的华南夏季降水类型日变化的时空分布特征[J].气象,49(3):279-290.
TANG Jing,CHEN Sheng,LI Zhi,WEI Chunxia,2023.Spatio-Temporal Distribution Characteristics of Diurnal Variation of Summer Rainfall in South China Based on Radar Observation[J].Meteor Mon,49(3):279-290.