一种用于旱涝分析的降水概率指标——Gamma分布概率指标  

An index of precipitation, probability for dryness/wetness analysis

作　　者：黄嘉佑[1] 

机构地区：[1]北京大学地球物理系

出　　处：《气象》1990年第9期8-12,共5页Meteorological Monthly

摘　　要：本文介绍以Gamma分布为基础的降水概率指标以及相应的旱涝级别。对北京地区7月、夏季(6—8月)及年的降水概率指标及早涝级别序列分析表明,它在描述气候状态上较传统的旱涝级别序列更为合理,分布更接近于正态。分析还表明,Gamma分布对降水量的描述有较高的稳定性。The index of precipitation probability and the grade of dryness/wet-ness based on Gamma distribution are presented in this paper.Sequential analysis on probability index of precipitation (in July,summer and in the year)and of the grade of dryness/wetness in Beijing area suggest that the series of the index and the grade of dryness/wetness based on Gamma distribution are better than the ones based on Normal distribution in describing the climatic states, The distribution of the former is closer to Normal than the latter.The results also show that Gamma distribution is more stable with time in presenting the precipitation.

关 键 词：旱涝分析 降水 概率指标 Г分布 

分 类 号：P333.2[天文地球—水文科学]