Specification of wet-day daily rainfall quantiles from the mean value

被引:13
作者
Benestad, R. E. [1 ]
Nychka, Doug [2 ]
Mearns, Linda O. [2 ]
机构
[1] Norwegian Meteorol Inst, Oslo, Norway
[2] Natl Ctr Atmospher Res, Inst Math Appl Geosci, Mesa Lab, Boulder, CO 80307 USA
关键词
precipitation; statistical distribution; DAILY PRECIPITATION; SPATIAL VARIABILITY; MODELS;
D O I
10.3402/tellusa.v64i0.14981
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The characteristics associated with an exponential distribution is used as a yard stick to assess distributions for 24-hr precipitation records from 13 771 rain gauges from mainly the USA and Europe. It is shown that the daily accumulated precipitation amount is approximately similar to an exponential distribution, but not identical, and that quantiles of the distributions can to a zeroth order be specified from the mean of the wet-day precipitation. However, the data have a thicker upper tail than the exponential distribution. We propose a simple method for making a crude estimate for quantiles of wet-day 24-hr precipitation distribution, and a refinement of the exponential distribution based on principal component analysis. We also show that the high quantiles are related to the wet-day mean. The associations between the wet-day mean and quantiles from the observations are compared with results from regional climate model simulations, taken from a number of regional climate models. Similar tendencies are seen in the models as in the rain gauge data.
引用
收藏
页数:14
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