ZHANG Haoran,ZHENG Jiafeng,CHE Yuzhang.Macro-microscopic Characteristics of Cloud-precipitation under the Influence of a Low Vortex over the Tibetan Plateau[J].Journal of Chengdu University of Information Technology,2023,38(06):681-688.[doi:10.16836/j.cnki.jcuit.2023.06.010]
一次青藏高原低涡影响下的云-降水宏微观特征研究
- Title:
- Macro-microscopic Characteristics of Cloud-precipitation under the Influence of a Low Vortex over the Tibetan Plateau
- 文章编号:
- 2096-1618(2023)06-0681-08
- Keywords:
- plateau vortex; cloud-precipitation; millimeter wave cloud radar; raindrops spectrum distribution
- 分类号:
- P407.2
- 文献标志码:
- A
- 摘要:
- 为进一步认识高原低涡影响下云-降水的垂直结构和微物理特征，利用那曲毫米波雷达和雨滴谱仪资料，结合ERA-5再分析和FY-2G卫星资料，对2015年8月17-19日一次高原涡云系的天气背景、雷达回波和相关物理量进行分析。结果表明，18日凌晨高原涡发展达到最强，那曲上空对流云发展旺盛; 随后，强度逐渐减弱，那曲上空过渡为层积云; 至19日20时，高原涡减弱消散。此次高原涡降水包含对流云降水和层积云降水，前者回波呈火焰状的上冲结构，回波强度达30 dBZ，但持续时间短，距离地面1 km处存在明显回波亮带; 后者在回波图上多为片状，雷达回波强度在20 dBZ以下，持续时间较长。两类降水的雨滴谱存在显著差异，对流云降水粒子直径更大、雨滴谱更宽。
- Abstract:
- To further understand the vertical structure and microphysical characteristics of cloud-precipitation under the influence of low plateau vortex, the weather background, radar echo and related physical quantities of a plateau vortex cloud system were analyzed on August 17-19, 2015 and analyzed by Naqu millimeter wave radar and raindrops spectrometer, combined with ERA-5 reanalysis and FY-2G satellite data. The results show that the plateau vortex reaches its strongest in the early morning of the 18th, and the convective cloud development over Nagqu is vigorous; then, the strength gradually weakens and it passes into cumulus; by 20:00 on the 19th, the plateau vortex weakened and dissipated. The plateau vortex precipitation includes convective cloud precipitation and cumulus precipitation. The former has a flame-like upward structure with echo intensity reaching 30 dBZ, but the duration is short, with an obvious echo bright belt at 1 km above the ground; the latter is mostly sheet on the echo chart, with radar echo intensity below 20 dBZ and long duration. The drop profiles differ significantly between the two types of precipitation, with a larger diameter of convective cloud precipitation particles and a wider droplet spectrum.
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备注/Memo
收稿日期:2022-10-19
基金项目:国家自然科学基金资助项目(41905084)