YU Jianyu,LI Maoshan,YIN Shucheng,et al.Analysis of Cloud Precipitation Microscopic Characteristic Raindrop Spectrum in Nagqu Area of Qinghai-Tibet Plateau[J].Journal of Chengdu University of Information Technology,2020,35(02):188-194.[doi:10.16836/j.cnki.jcuit.2020.02.010]
青藏高原那曲地区云降水微观特征雨滴谱分析
- Title:
- Analysis of Cloud Precipitation Microscopic Characteristic Raindrop Spectrum in Nagqu Area of Qinghai-Tibet Plateau
- 文章编号:
- 2096-1618(2020)02-0188-07
- Keywords:
- atmospheric physics; cloud microphysics; Nagqu region of Qinghai-Tibet Plateau; raindrop spectrum; M-P distribution; Gamma distribution
- 分类号:
- P426.6
- 文献标志码:
- A
- 摘要:
- 为探究青藏高原那曲地区夏季云降水的分布特征,利用2014年6月1日-7月31日那曲地区PS-32型地面激光雨滴谱仪所测得的96次降水资料,并依据降水云的性质进行统计分类,运用M-P拟合和Gamma拟合的方法对3类降水云的雨滴谱分布及其微观特征物理量的演变进行分析和检验,得出结果:(1)那曲地区降水以对流云为主;(2)3类云降水的平均雨滴谱谱宽有着明显差异,M-P拟合最适合用于层状云降水分布,Gamma拟合适用于积雨云和积层混合云雨滴谱的分布;(3)3类云降水的雨强贡献均来自大雨滴谱(即直径>1 mm的雨滴)的贡献,其中层状云降水和积层混合云降水的雨强贡献主要来自直径为1～2 mm的雨滴,积雨云降水主的雨强贡献来自直径>2 mm的雨滴。此外,在对流云降水过程中存在雨滴数密度和雨强增大之前,常伴随特大直径降水粒子先出现的现象。
- Abstract:
- To explore the distribution characteristics of precipitation of Qinghai-Tibet Plateau Nagqu area in summer cloud, 96 precipitation data measured by PS-32 ground laser raindrop spectrometer in Naqu area from June 1 to July 31, 2014 are appliedand classified according to the characteristics of the precipitation cloud into statistical classification. The M-P distribution and Gamma distribution method are utilized to analyze and test thethree kinds of precipitation clouds raindrop spectrum distribution and the evolution of the microscopic characteristics of physical quantity and the results suggest that:(1)the rainfall in Nagqu area is dominated by convective clouds;(2)the average raindrop spectral width of the three types of cloud precipitation is obviously different, M-P distribution is most suitable for the distribution of stratiform cloud precipitation, while Gamma distribution is suitable for the distribution of cumulonimbus cloud and cumulonimbus mixed cloud droplet spectra;(3)the rain intensity contribution of the three types of cloud precipitation is all from the large raindrop spectrum(Raindrops larger than 1mm in diameter), among which the rain intensity contribution of stratiform cloud precipitation and stratiform mixed cloud precipitation mainly comes from raindrops with a diameter of 1-2 mm, while the rain intensity contribution of cumulonimbus precipitation mainly comes from raindrops with a diameter of more than 2mm.In addition, in the process of convective cloud precipitation, before the increase of the rain drops density and rain intensity, often accompanied by the phenomenon that the precipitation particles with large diameter first appear.
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备注/Memo
收稿日期:2019-06-28 基金项目:国家重点研发计划资助项目(2018YFC1505702); 国家自然科学基金资助项目(41675106)