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- Title
浙江夏季弱天气尺度强迫背景下午后局地热对流特征分析.
- Authors
沈晓玲; 章丽娜; 桑明慧; 李文娟
- Abstract
Based on high-altitude observational data, Zhejiang Doppler radar products, and ERA5 hourly reanalysis data (0.25 °×0.25 °), the present study analyzed the spatial and temporal distribution, life cycle, and environmental parameters of local thermal convection (classified into localized moving convection and localized anchoring convection according to moving speed) in the afternoon under the background of weak synoptic-scale forcing in summer (from June to August) in Zhejiang from 2015 to 2021. The results show that: (1) The triggering frequency of the two types of thermal convection is the same, and the interannual variation is large, but the annual, monthly and daily variation trends are basically the same. Localized anchoring convection easily occurs in the afternoon while localized moving convection easily occurs in the evening. (2) The triggering of local thermal convection is closely related to the terrain. The high-frequency area is located in the coastal areas of eastern, northwestern, and southwestern mountainous areas in Zhejiang while the low-frequency area is located in the plain and basin in central and northern Zhejiang. The triggering frequency of thermal convection decreases with the increase in height, which is mostly triggered at the middle and low altitudes in the mountains and nearby. It is easier to trigger localized anchoring convection in the mid- and high-altitude areas. (3) Both types of convection can be triggered in the environment of weak vertical wind shear, and localized moving convection is easier to develop.
- Publication
Journal of Tropical Meteorology (1004-4965), 2023, Vol 39, Issue 4, p443
- ISSN
1004-4965
- Publication type
Article
- DOI
10.16032/j.issn.1004-4965.2023.040