沙漠与绿洲气象2015，Vol.9Issue(5)：56-61,6.DOI:10.3969/j.issn.1002-0799.2015.05.009
伊犁河谷汛期一次短时强降水雨滴谱特征分析
Characteristics of the Raindrop Spectrum during a Short-time Strong Precipitation Episode in the Yili River Valley
摘要
Abstract
Using conventional ground and aerial data, new generation of weather radar data, raindrop size distribution data, the background, characteristics of radar echo and microphysical characteristics of a rainstorm occurred in wide range of Yili river valley on August 3, 2012 were analyzed. The results showed that 200 hPa West Siberia westerly trough , 500 hPa Central Asia vortex and surface cold front were the main impact of the heavy rainfall system. The bell shape of the valley terrain resulting in airflow mechanical compression, and triggering convection, terrain forcing air uplift had important influences on the enhanced convection and precipitation. This precipitation process was laminated hybrid cloud precipitation, where large areas of strati-form clouds embedded in multiple convective clouds, these clouds were connected together to constitute the convective rain bands. The storm caused mainly by the convective clouds of which the microphysical structure was obvious in heterogeneity and there were multiple centers of heavy precipitation, the horizontal scale mainly maintained around 10 km, duration mainly from five minutes to 10 minutes. The raindrops had high concentrations, generally above 1,000 m-1. The raindrop size distribution width was wide and very different. The high concentrations of particles less than 1 mm occupied 60% of all sizes, but their contribution to rainfall intensity accounted for about 20%.关键词
伊犁河谷/暴雨/粒子数浓度/雨滴谱Key words
Yili river valley/storm/raindrop size concentration/raindrop spectrum分类
天文与地球科学引用本文复制引用
江新安,王敏仲..伊犁河谷汛期一次短时强降水雨滴谱特征分析[J].沙漠与绿洲气象,2015,9(5):56-61,6.基金项目
国家科技支撑计划课题(2012BAC23B01) （2012BAC23B01）
国家自然科学基金项目(41305035)共同资助. （41305035）
