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投稿时间：2011-01-10 修订日期：2011-10-01
投稿时间：2011-01-10 修订日期：2011-10-01
中文摘要: 利用1955—2007年拉萨市逐日降水和气温地面观测资料，分析了拉萨市雨季（5—9月）夜雨率变化特征。结果表明：拉萨市整个雨季日夜雨率变化是比较稳定的，近50多年来基本没有发生明显的年代际变化。夜雨率与日降水量有显著关联，当日降水量在25 mm以下时，夜雨率随降水量增加而增大，当日降水量 ＜1 mm时夜雨率最小为75.2％，当日降水量为25 mm时，夜雨率达到最大值93.4％；夜雨率与日温差存在显著的负相关；拉萨多夜雨与地形有关，高夜雨率既有有利的一面，也会带来一些负面影响。因此，深入探讨夜雨率是制定有效防御气象灾害对策的重要依据。
中文关键词: 拉萨市， 夜雨率， 变化特征， 雨季， 降水量
Abstract:Using daily precipitation and air temperature data of Lhasa to analyze the night rain rate in rainy season (May-September) during years 1955-2007, the results could be summarized as follows: The variations of night rain rate was comparatively stable in whole rainy season, without obvious inter decadal changes during the past 50 years. The night rain rate was significantly associated with daily precipitation, and the night rain rate increased with the enhancement of precipitation when rainfall was below 25 mm, it was the minimum 75.2% when daily rainfall was below 1 mm, and it was the maximum 93.4% when daily rainfall was 25 mm. There is a significantly negative correlation between night rain rate and daily temperature. In the meantime, the night rain is related with the terrain. The high night rain rate has its advantageous aspect, but also it will bring some negative influences.
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基金项目:公益性行业（气象）科研项目（编号: GYHY201006040）资助
| Author Name | Affiliation |
| Yu Zhongshui | Xizang Meteorological Observatory, Lhasa 850000 |
引用文本：
余忠水,2011.1955—2007年拉萨市雨季夜雨率变化特征[J].气象,37(12):1584-1588.
Yu Zhongshui,2011.The Night Rain Rate Variations of Lhasa in Rainy Season During 1955-2007[J].Meteor Mon,37(12):1584-1588.
余忠水,2011.1955—2007年拉萨市雨季夜雨率变化特征[J].气象,37(12):1584-1588.
Yu Zhongshui,2011.The Night Rain Rate Variations of Lhasa in Rainy Season During 1955-2007[J].Meteor Mon,37(12):1584-1588.