气候变化领域集成服务门户(CCPortal): A simple equation to study changes in rainfall statistics

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DOI	10.1088/1748-9326/ab2bb2
	A simple equation to study changes in rainfall statistics
	Benestad R.E.; Parding K.M.; Erlandsen H.B.; Mezghani A.
发表日期	2019
ISSN	17489318
卷号	14 期号:8
英文摘要	We test an equation for the probability of heavy 24 h precipitation amounts Pr(X > x) as a function of the wet-day frequency and the wet-day mean precipitation. The expression was evaluated against 9817 daily rain gauge records world-wide and was subsequently used to derive mathematical expressions for different rainfall statistics in terms of the wet-day frequency and the wet-day mean precipitation. This framework comprised expressions for probabilities, mean, variance, and return-values. We differentiated these statistics with respect to time and compared them to trends in number of rainy days and the mean rainfall intensity based on 1875 rain gauge records with more than 50 years of valid data over the period 1961-2018. The results indicate that there has been a general increase in the probability of precipitation exceeding 50 mm/day. The main cause for this increase has been a boost in the intensity of the rain, but there were also some cases where it has been due to more rainy days. In some limited regions there has also been an increase in Pr(X > 50 mm/day) that coincided with a decrease in the number of rainy days. We also found a general increasing trend in the variance and the 10-year return-value over 1961-2018 due to increasing wet-day frequency and wet-day mean precipitation. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	heavy rainfall; probability; rain gauge data; rainfall statistics; trend; wet-day frequency; wet-day mean precipitation
语种	英语
scopus关键词	Probability; Rain gages; Heavy rainfall; Mean precipitation; Rain gauge data; Rainfall statistics; trend; Wet-day frequency; Rain; precipitation (climatology); precipitation intensity; rainfall; raingauge; statistical analysis; trend analysis
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154465
作者单位	Norwegian Meteorological Institute, Oslo, NO 0313, Norway
推荐引用方式 GB/T 7714	Benestad R.E.,Parding K.M.,Erlandsen H.B.,et al. A simple equation to study changes in rainfall statistics[J],2019,14(8).
APA	Benestad R.E.,Parding K.M.,Erlandsen H.B.,&Mezghani A..(2019).A simple equation to study changes in rainfall statistics.Environmental Research Letters,14(8).
MLA	Benestad R.E.,et al."A simple equation to study changes in rainfall statistics".Environmental Research Letters 14.8(2019).