摘要
本文基于2000~2014年共计15年夏季(6~8月)的TRMM卫星PR(测雨雷达)探测结果 2A25资料,对高原东坡及临近区域降水的水平、垂直分布特征,以及日变化特征进行了分析,结果揭示了高原对降水的影响。由降水样本数占PR总观测样本数的比例可知,降水频次表现为高原低、东部盆地高的特点,平均降水强度也类似。层云降水频次高于对流降水,但平均降水率低于对流降水。降水的垂直分布表明,下垫面高度超过3km时,降水率廓线峰值出现在5~6km,而其它地区峰值出现在3~4km高度。该区域的降水以夜雨为主;高原上的对流类型降水主要发生在白天,盆地和丘陵地区降水主要发生在夜间。
Based on 15 years （2000 ？ 2 0 1 4 ） summer PRobservations of 2A25 datasets, the distribution pattern andnal character of precipitation on the eastern flank of the Tibetan Plateau and adjoin region is analyzed. The result reveals tlie fluence of tlie plateau on the rainfall in this area. In general, the frequency of precipitation shows a and high value in the eastern region. The mean rain rate shows similar horizontal pattern to the frequency. Stratiform rain showshigher frequency and lower mean rain rate than convective rain. The vertical rain rate profiles show that, where the height ofunderlying surface is over 3 km, the average rain rate profiles show peaks at the height of 5 - 6km. Over the other regions, pro-files showpeaks at the height of 3 ？ 4km. The diurnal variation of precipitation reveals that, more rainfall happens in the eve-ning in this area. The convective rain always falls during the day time over the plateau, and often falls in the evening in theeastern basin and hil regions.
出处
《高原山地气象研究》
2017年第3期10-15,共6页
Plateau and Mountain Meteorology Research
基金
国家自然科学基金项目(91337215)
四川省气象局川气课题2014-青年-04
关键词
测雨雷达
降水
青藏高原
precipitation radar, precipitation, the Tibetan Plateau
作者简介
衡志炜,助理研究员,主要从事云和降水分析及数值模拟研究.E-mail：hzwjy@foxmail.com
