一次东北冷涡的天气学分析及基于HYSPLIT4模式的水汽通道特征

摘 要：利用连续一年旌德县负氧离子监测数据，分别以兔儿山公园、路西村茶园代表城市公园、高山茶园这两种生态环境，对城市公园和高山茶园负氧离子浓度特征以及气象要素对负氧离子浓度影响进行比较分析。结果表明：①高山茶园负氧离子浓度显著高于城市公园；②负氧离子浓度夏季最高，冬季最低，春秋季次之，6月负氧离子浓度达全年最高；③负氧离子浓度日变化整体呈“一峰一谷”变化趋势，峰值出现在上午，谷值出现在正午前后，夜间至上午负氧离子浓度较高，城市公园负氧离子浓度日较差较高山茶园偏小；④负氧离子浓度日变化与气温、风速呈显著负相关；⑤负氧离子浓度雨天最高，晴天次之，阴天和多云相对较低，暴雨天气条件下大气负氧离子浓度显著提高。

Synoptic Analysis of a Northeast Cold Vortex and Characteristics of Water Vapor Channels Based on HYSPLIT4

Based on the HYSPLIT_4,this paper tracks the water vapor transport and the source of a Northeastern Cold Vortex precipitation from July 23 to 29,2016 to anylyze the structural characteristics of this process by combining the analysis of high and low circulation and physical field.The results showed that:(1)When the Northeastern Cold Vortex is developing, the rain belt shows northeast-southwest direction, and moves eastward.(2)Impact system of high and low layer is a backward structure in vertical direction. Three fectors, jet of high and low layer, the convergence of cold and warm air,water vapor convergence over low layer,commonly causes the precipitation.(3) Water vapor are mainly from the Bay of Bengal and the South China Sea, meanwhile,a small part of the water vapor over high-layer are from the western Caspian Sea.