基于高分辨率格点数据的2008-2013年青藏高原面雨量特征  

Areal precipitation features revealed by high-resolution gridded dataset in the Tibetan Plateau during 2008-2013

作　　者：杨森[1] 张明军[1] 王圣杰[1] 王杰[1] 陈荣[1] 马荣[1] 潘素敏[1] 

机构地区：[1]西北师范大学地理与环境科学学院,甘肃兰州730070

出　　处：《冰川冻土》2017年第5期1113-1121,共9页Journal of Glaciology and Geocryology

基　　金：科技部全球变化研究国家重大科学研究计划项目(2013CBA01801);国家自然科学基金项目(41161012);甘肃省高等学校基本科研业务费项目资助

摘　　要：基于中国自动气象站与CMORPH降水产品融合的0.1°×0.1°高分辨率逐时降水量网格数据集以及气象站点日降水的实测资料,对青藏高原面雨量的空间分布做了研究,并运用线性分析法对青藏高原季节面雨量和逐时面雨量的年际变化做了分析。结果表明:(1)0.1°×0.1°高分辨率格点降水数据能够准确地反映青藏高原面雨量的空间分布特征,东南缘的降雨量远大于西北部。格点数据与站点数据之间偏差率小于20%的站点占到站点总数(84个)的65.48%,相关系数大于0.9的站点有48个。(2)2008-2013年青藏高原总面雨量的年均值为133.42×10^(10)m^3,夏季面雨量最大,占到全年面雨量的51.48%。四季面雨量均呈增长趋势,春、夏、秋、冬的线性倾向率分别为0.40×10^(10)m^3·a^(-1)、3.11×10^(10)m^3·a^(-1)、1.30×10^(10)m^3·a^(-1)和0.92×10^(10)m^3·a^(-1)。(3)面雨量峰值出现在19:00-20:00(北京时间,下同),面雨量增多的时间出现在17:00-02:00。In this paper, based on hourly merged precipitation dataset and observations at meteorological stations derived from the national automatic weather stations and CMORPH （Climate Prediction Center Morphing technique） product at a 0.1 ° × 0.1 ° high-resolution, the variations of seasonal and hourly areal precipitations on the Tibetan Plateau were analyzed by using linear analysis. The results showed that： （1） The spatial distribution of precipitation in the Tibetan Plateau could be exactly reflected by the 0.1 ° × 0.1 high-resolution gridded dataset. The areal precipitation in southeast edge of the plateau is generally larger than that in northwest. There were 65.48% stations having a percent bias less than 20% between gridded dataset and observations, with 48 stations exhibiting correlation coefficient more than 0.9. （2） The annual mean areal precipitation was 133.42 × 10^10 m^3, mostly in summer, accounting for 51.48 % of the total. The areal precipitation in spring, summer, autumn and winter were all increasing, with the rate of 0.40× 10^10, 3.11 × 10^10, 1.30 × 10^10 and 0.92 × 10^10 m^3 · a^-1. （3） The peak time of areal precipitation in the plateau was during 19：00 -20：00 （Beijing Time）. Hourly areal precipitation increased from 17：00 to 02：00 （Beijing Time）.

关 键 词：面雨量 格点数据 青藏高原 年际变化 

分 类 号：P468.024[天文地球—大气科学及气象学]