祁连山区春季降雪滴谱特性分析

Analyzing the Characteristics of the Snow Size Spectra in the Qilian Mountains in Spring

利用2008年3-4月青海省祁连县黑河流域气象要素及双偏振多普勒雷达降水观测试验中激光扫描滴谱仪获取的雪滴谱资料,选取了有代表性的4个时段的数据,运用最小二乘法对其进行了M-P分布和Γ分布拟合分析.结果表明:Γ分布可以很好的模拟实际雪滴谱;雪滴谱同雨滴谱一样同样具有多峰的结构;研究了降雪过程微结构参量的演变,讨论了祁连山地区雪滴谱分布的基本特征.计算了≤2 mm雪片对总降雪量的贡献,表明在该地区春季降雪中,小滴对降雪强度的贡献较大,大滴的出现超前于强降雪.得到了适合该地区降雪的Z^R关系.

Under the Watershed Airborne Telemetry Experimental Research,a lot of snow size data were collected from March to April,2008.The experiment area is located in the northeast of Tibetan Plateau(39.06° N,100.44° E),at the altitude of 3 002 m a.s.l.,with a semi-arid mountain forest climate.The instrumentation used is OTT Parsivel Disdrometer made by German,the new generation of Parsivel disdrometer,which is equipped with the latest state of the art optical laser technology.Of all the snow-size data obtained in ...