Climatic Characteristics of Extremely Heavy Precipitation Eventsin Flood Season in Yunnan Province

Journal of Arid Meteorology ›› 2012, Vol. 30 ›› Issue (1): 15-20.

Climatic Characteristics of Extremely Heavy Precipitation Eventsin Flood Season in Yunnan Province

1． Yuxi Meteorological Bureau of Yunnan Province，Yuxi 653100，China;
2． Institute of Meteorological Science of Yunnan Province，Kunming 650034，China.

Received:2011-11-24 Online:2012-02-29 Published:2012-03-30

云南省汛期极端强降水事件的气候特征

刘丽¹ ，陶云²

1．云南省玉溪市气象局，云南玉溪653100; 2．云南省气象科学研究所，云南昆明650034

作者简介:刘丽( 1968 － ) ，女，云南省通海县人，硕士，高级工程师，主要从事天气气候变化及影响研究． E － mail: liuli10895@126． com
基金资助:
云南省气象局气候变化研究专项( Qh201101) 及国家自然科学研究基金( U0933603) 资助

Abstract

Abstract:

Based on daily precipitation data of 94 stations in Yunnan during 1961 － 2008，extremely heavy precipitation threshold for each station was determined according to the 95th percentiles，and the temporal and spatial distribution of frequency of extremely heavy precipitation events in flood season ( May to October) in recent 50 years was diagnosed by using principal component analysis，linear trend and power spectral density analysis method． The results show that the threshold of extremely heavy precipitation events in Yunnan in flood season increased from northwest to southeast; Frequency of extremely heavy precipitation events according to the 95th percentiles and rainfall more than 25 mm had little difference in spatial distribution，but both increase from north to south; A consistent anomaly distribution was the main spatial mode for frequency of extremely heavy precipitation events in flood season in Yunnan; The frequency of extremely heavy precipitation events in flood season presented a weak linear increasing trend，especially obvious in the lower reaches of the Lancang River and the Red River，and west part of the Ailaoshan Mountain，but a linear decreasing trend from Kunming to the west part of Qujing． Meanwhile there was an oscillation cycle of 2 － 3 years about extremely heavy precipitation events in Yunnan in recent 50 years．

Key words: extremely heavy precipitation events, spatial and temporal distribution, flood season, Yunnan

摘要：

利用云南省1961 ～ 2008 年94 个站点逐日降水资料，根据百分位法定义了不同站点的极端强降水阈值，应用EOF、线性倾向率和周期分析方法，对云南极端强降水事件频数进行了时空分布特征诊断。结果表明: 云南省汛期极端强降水阈值的空间分布呈西北至东南逐渐增大的分布趋势; 以百分位法定义的极端强降水事件频数和大雨及以上强降水频数的空间分布趋势，在细节上有一定差异，但均表现为从北向南逐渐递增; 一致性异常分布是云南汛期极端强降水事件频数的最主要空间模态; 近50 a 来云南汛期极端强降水事件频数呈现弱的线性增加趋势，其中增加较明显的区域位于澜沧江、红河的下游区域、哀牢山以西一带，而昆明大部到曲靖西部则呈现较明显的线性减少趋势; 近50 a 来云南汛期极端强降水事件存在2 ～ 3 a 的振荡周期。

关键词: 极端强降水事件, 时空分布特征, 汛期, 云南

CLC Number:

P468． 0 ⁺ 24

刘丽, 陶云. 云南省汛期极端强降水事件的气候特征[J]. 干旱气象, 2012, 30(1): 15-20.

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