青藏高原一次暴雪过程诊断分析
Diagnostic Analysis of a Snowstorm in Tibetan Plateau
白觉平措 1索朗央金2
作者信息
- 1. 西藏自治区气象台,西藏拉萨850000
- 2. 山南地区气象局,西藏山南856000
- 折叠
摘要
利用常规观测资料、NCEP 1°×1°每6h分析资料、fnl资料,结合分析FY-2C水汽图像和水汽云图,从500 hPa环流背景、影响系统及水汽、动力条件等方面对2013年1月17 ～ 19日青藏高原的一次暴雪过程进行了诊断分析.结果表明,此次暴风雪天气发生在北半球环流呈三槽两脊经向度较大的环流背景下;伊朗南支槽是主要的影响系统;高层强烈辐散配置导致强垂直上升运动;伊朗南支槽东移上高原,西太平洋副热带高压的位置和强度有利于伊朗南支槽的加强、维持、缓慢东移来影响高原西部,即伊朗南支槽为此次高原西部的暴风雪天气提供了稳定的环流背景,同时不能忽视高原大地形的影响.
Abstract
By using conventional observation data,every 6 hours data of NCEP1 ° × 1 °,fnl data,combined with the analysis of FY-2C water vapor image and water vapor cloud,a snowstorm process in Tibetan Plateau during Jan.17-19,2013 was analyzed from aspects of 500 bPa circulation background,influence system and water vapor,dynamic conditions.The results showed that the snowstorm occurred in northern hemisphere circulation with three slots and two ridges and greater degree;southern Iran trough was the main influencing system;high intense divergence caused strong vertical ascending motion;southern Iran trough eastward on the plateau,the location and intensity of the West Pacific subtropical high were conductive for southern lran trough to strength,maintain,slowly eastward to influence the western plateau,namely southern Iran trough provides a stable circulation background for the snowstorm in western plateau,also cannot ignore the influence of megarelief of Tibetan Plateau.
关键词
暴雪/环流背景/水汽条件/动力条件/青藏高原Key words
Snowstorm/Circulation background/Water vapor condition/Dynamic condition/Tibetan Plateau引用本文复制引用
出版年
2016
国家科技期刊平台
NSTL
维普
万方数据