中国大陆地区小时极端降水阈值的计算与分析

被引:61
作者
李建 [1 ]
宇如聪 [1 ]
孙溦 [2 ,3 ]
机构
[1] 中国气象科学研究院
[2] 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室
[3] 中国科学院大学
关键词
极端降水; 降水强度阈值; 广义极值分布; 百分位;
D O I
暂无
中图分类号
P426.6 [降水];
学科分类号
摘要
利用广义极值分布和百分位两种阈值确定方法,对我国465个气象站点不同极端程度的小时降水强度阈值进行了分析。广义极值分布结果表明,重现期为2、5、10、50a的降水强度阈值具有一致的空间分布特征:华南沿海阈值最高,长江中下游地区北部、四川盆地西部、华北地区东部次之,云南中西部、华北西部和东北西部阈值相对更低,最小值出现在我国西部地区。百分位法得到的阈值空间分布呈现出与广义极值分布结果较为一致的东南大、西北小的整体特征。考察465站中位数发现,第99.9百分位的强度阈值与二年一遇降水的阈值接近。具体分析各站第99.9百分位降水阈值对应的重现期发现,长江流域及其以南地区重现期大多低于2a;35°N一带重现期长于4a;我国北方和西北部分地区重现期长于8a。
引用
收藏
页码:11 / 16
页数:6
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