摘要
在GCMS(大气环流模式)中,降水空间分布描述在陆面水文参数化中非常重要。利用1998—2003年淮河流域一个网格区域内32个站夏季逐小时降水资料,分析降水在区域内统计特征,并利用统计特征及一个随机降水离散方案实现平均降水强度在区域内分配。结果表明,在区域内降水空间分布是非均匀的,区域内的平均降水强度和区域内降水分布面积之间有密切关系,取一定平均降水强度间隔,降水分布面积和发生频率满足固定的分布形态。随机降水离散方案可以较好实现降水在区域内分配。
The spatial variability of precipitation distribution is important for land surface hydrolo- gy parameterization of GCM. By use of intensified hourly data over Huaihe basin during 1998 - 2003 summer, an analysis is made to study the spatial distribution of precipitation over this area. Results show that the precipitation spatial distribution is heterogeneous with a close relation to the average precipitation intensity and coverage area. Statistical evidence suggests that PDF (probability density function) of coverage area and occurrence frequency probably presented stable mode with properly interval mean rain intensity. The discrete scheme of random precipitation can be used successfully to generate the precipitation distribution in sub grid.
出处
《气象》
CSCD
北大核心
2008年第8期51-57,共7页
Meteorological Monthly
基金
国家自然科学基金面上项目(40375026)
江苏省高校研究生创新计划项目
中国科技基础研究前期研究专项(2002ccd00100)资助
关键词
降水分布
非均匀性
平均降水强度
降水分布面积
随机降水离散方案
precipitation distribution heterogeneity mean rain intensity coverage area stochastic precipitation discrete scheme