东天山迎风坡与高海拔区域降水效率对比研究

利用WRF中尺度数值模式对2015年4月16~17日发生在新疆天山地区一次降水过程进行数值模拟研究。重点对比了迎风坡与高海拔区域降水效率的差异,进而分析产生这种差异的原因。结果表明:迎风坡的降水效率大于高海拔区域的降水效率,降水过程发展旺盛阶段,降水效率达到最大。迎风坡的降水主要由雪、霰融化为雨水产生,高海拔区域降水主要由雪产生。该微物理机制的差异造成在降水集中时段,虽然高海拨区域空中总水凝物多于迎风坡,但降水效率低于迎风坡,最终导致降水强度小于迎风坡。

The Comparative Study on the Precipitation Efficiency Between Windward Slope and High Altitude Region in the Eastern Tianshan Mountains

The mesoscale numerical model WRF was used to research a precipitation process in the eastern Tianshan Mountains during 16~17 April 2010,the difference of precipitation efficiency between the windward slope and high altitude region in the eastern Tianshan Mountains were mainly discussed and then analyze the reasons for this difference. The results presented that the precipitation efficiency in the windward slope is higher than that in the high altitude region, when the precipitation process is concentrated, the precipitation efficiency is the biggest. The precipitation in the windward slope is mainly produced by melting snow and melting graupel, while the precipitation in the high altitude region is mainly produced by snow. In strong precipitation period, total hydrometeor in the high altitude region are higher than that in the windward slope, but precipitation efficiency is less, the difference of microphysical mechanism led to the less precipitation intensity in the high altitude region.