Statistical Analysis of Mesovortices during the First Rainy Season in Guangdong, South China
Based on Doppler radar observation and reanalysis data, the statistical characteristics of mesovortices (MVs) during the first rainy season (April–June) in Guangdong, South China, from 2017 to 2019 are studied, including their spatiotemporal distributions, structural features and favorable environme...
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| Format: | Article |
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MDPI AG
2023-04-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/8/2176 |
| _version_ | 1827743789519732736 |
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| author | Ying Tang Xin Xu Yuanyuan Ju Zhenyu Wu Shushi Zhang Xunlai Chen Qi Xu |
| author_facet | Ying Tang Xin Xu Yuanyuan Ju Zhenyu Wu Shushi Zhang Xunlai Chen Qi Xu |
| author_sort | Ying Tang |
| collection | DOAJ |
| description | Based on Doppler radar observation and reanalysis data, the statistical characteristics of mesovortices (MVs) during the first rainy season (April–June) in Guangdong, South China, from 2017 to 2019 are studied, including their spatiotemporal distributions, structural features and favorable environmental conditions. The results show that the MVs usually exhibit short lifetimes; about 70% last for less than 30 min. The intensity and horizontal scale of the MVs are proportional to their lifetime. Long-lived MVs have larger horizontal scales and stronger intensities than short-lived ones. The MVs are mainly observed over the Pearl River Delta region, followed by western Guangdong Province, but relatively fewer in both eastern and northern Guangdong Province. The uneven spatial distribution of the MVs is closely related to the differences in the topographical features and the environment conditions over South China. MVs are prone to form over flat regions. The Pearl River Delta and eastern Guangdong regions are relatively flat compared to the more mountainous western and northern Guangdong regions. Moreover, the monsoonal south-westerlies, water vapor flux, atmospheric instability and vertical wind shear over southwest Guangdong are significantly larger than those in other regions and are favorable for the formation of MVs. The occurrence frequencies of MVs in central and southern parts of Guangdong display similar diurnal variations, reaching the peak during the late afternoon and early evening while dropping to the minimum overnight. However, the situation is opposite in northern Guangdong, with the peak overnight and the minimum during the late afternoon and early evening. The regional differences in diurnal variation are likely related to the moving direction of mesoscale convective systems (MCSs) in Guangdong. |
| first_indexed | 2024-03-11T04:34:28Z |
| format | Article |
| id | doaj.art-e1a3b27d593d4f9f835579ed24cede76 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-11T04:34:28Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-e1a3b27d593d4f9f835579ed24cede762023-11-17T21:13:06ZengMDPI AGRemote Sensing2072-42922023-04-01158217610.3390/rs15082176Statistical Analysis of Mesovortices during the First Rainy Season in Guangdong, South ChinaYing Tang0Xin Xu1Yuanyuan Ju2Zhenyu Wu3Shushi Zhang4Xunlai Chen5Qi Xu6Nanjing Marine Radar Institute, Nanjing 210023, ChinaKey Laboratory of Mesoscale Severe Weather, Ministry of Education, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, ChinaKey Laboratory of Mesoscale Severe Weather, Ministry of Education, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, ChinaNanjing Marine Radar Institute, Nanjing 210023, ChinaKey Laboratory of Transportation Meteorology of China Meteorological Administration, Nanjing Joint Institute for Atmospheric Sciences, Nanjing 210023, ChinaShenzhen Meteorology Bureau, Shenzhen 518040, ChinaJiangsu Air Traffic Management Branch Bureau of Civil Aviation Administration of China, Nanjing 211113, ChinaBased on Doppler radar observation and reanalysis data, the statistical characteristics of mesovortices (MVs) during the first rainy season (April–June) in Guangdong, South China, from 2017 to 2019 are studied, including their spatiotemporal distributions, structural features and favorable environmental conditions. The results show that the MVs usually exhibit short lifetimes; about 70% last for less than 30 min. The intensity and horizontal scale of the MVs are proportional to their lifetime. Long-lived MVs have larger horizontal scales and stronger intensities than short-lived ones. The MVs are mainly observed over the Pearl River Delta region, followed by western Guangdong Province, but relatively fewer in both eastern and northern Guangdong Province. The uneven spatial distribution of the MVs is closely related to the differences in the topographical features and the environment conditions over South China. MVs are prone to form over flat regions. The Pearl River Delta and eastern Guangdong regions are relatively flat compared to the more mountainous western and northern Guangdong regions. Moreover, the monsoonal south-westerlies, water vapor flux, atmospheric instability and vertical wind shear over southwest Guangdong are significantly larger than those in other regions and are favorable for the formation of MVs. The occurrence frequencies of MVs in central and southern parts of Guangdong display similar diurnal variations, reaching the peak during the late afternoon and early evening while dropping to the minimum overnight. However, the situation is opposite in northern Guangdong, with the peak overnight and the minimum during the late afternoon and early evening. The regional differences in diurnal variation are likely related to the moving direction of mesoscale convective systems (MCSs) in Guangdong.https://www.mdpi.com/2072-4292/15/8/2176mesovorticesDoppler radarfirst rainy seasonPearl River Delta region |
| spellingShingle | Ying Tang Xin Xu Yuanyuan Ju Zhenyu Wu Shushi Zhang Xunlai Chen Qi Xu Statistical Analysis of Mesovortices during the First Rainy Season in Guangdong, South China Remote Sensing mesovortices Doppler radar first rainy season Pearl River Delta region |
| title | Statistical Analysis of Mesovortices during the First Rainy Season in Guangdong, South China |
| title_full | Statistical Analysis of Mesovortices during the First Rainy Season in Guangdong, South China |
| title_fullStr | Statistical Analysis of Mesovortices during the First Rainy Season in Guangdong, South China |
| title_full_unstemmed | Statistical Analysis of Mesovortices during the First Rainy Season in Guangdong, South China |
| title_short | Statistical Analysis of Mesovortices during the First Rainy Season in Guangdong, South China |
| title_sort | statistical analysis of mesovortices during the first rainy season in guangdong south china |
| topic | mesovortices Doppler radar first rainy season Pearl River Delta region |
| url | https://www.mdpi.com/2072-4292/15/8/2176 |
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