氣候變暖背景下寧夏暴雨日數(shù)的變化

氣候變化研究進(jìn)展 ?? 2007, Vol. 03 ?? Issue (02): 85-090.

氣候變暖背景下寧夏暴雨日數(shù)的變化

陳曉光鄭廣芬陳曉娟張智

青海省氣象局

收稿日期:2006-07-10 修回日期:2006-09-19 出版日期:2007-03-30 發(fā)布日期:2007-03-30
通訊作者: 鄭廣芬

Change of Ningxia Torrential Rain Days Under Climate Warming

Chen Xiao-Guang

Received:2006-07-10 Revised:2006-09-19 Online:2007-03-30 Published:2007-03-30

摘要/Abstract

摘要： 根據(jù)寧夏夏季暴雨日數(shù)資料、銀川探空資料和NCEP再分析資料，分析了氣候變暖背景下，寧夏暴雨日數(shù)的變化規(guī)律和成因。結(jié)果表明，氣候變暖后年暴雨日數(shù)明顯增多， 6、7月白晝和夜間的暴雨日數(shù)增加，8月白晝的暴雨日數(shù)增加而夜間的減少。成因分析結(jié)果表明，氣候變暖后7、8月白天的大氣潛在不穩(wěn)定性增強(qiáng)，夜間的大氣潛在不穩(wěn)定性7月增強(qiáng)而8月減弱，造成了銀川上空大氣溫度垂直結(jié)構(gòu)的日變化明顯，導(dǎo)致了寧夏暴雨日數(shù)的增多和暴雨的日變化顯著。

關(guān)鍵詞: 氣候變化, 暴雨日數(shù), 大氣環(huán)流, 成因

Abstract: By using the Ningxia summer torrential rain days data, the Yinchuan sounding data and the NCEP/NCAR reanalyzed data, the evolutional characteristics and the cause of Ningxia torrential rain days are analyzed under the background of climate warming. The results show that both annual torrential rain days and annual mean temperature displayed a consistent trend, which means that with increase in annual mean temperature, the annual torrential rain days also increased obviously. Further analysis results indicate that atmospheric potential instability has been grown in the daytime in both July and August after the climate warming (1986) of Ningxia, but in the nighttime it has been grown in July but decayed in August. Therefore, the climate warming not only caused more obvious diurnal variation of the vertical distribution of atmospheric temperature in Yinchuan, but also resulted in the increase of torrential rain days and in more obvious diurnal variation of the torrential rain in Ningxia.

Key words: climate change, torrential rain days, atmospheric circulation, formation mechanism, Ningxia

陳曉光鄭廣芬陳曉娟張智. 氣候變暖背景下寧夏暴雨日數(shù)的變化[J]. 氣候變化研究進(jìn)展, 2007, 03(02): 85-090.

Chen Xiao-Guang . Change of Ningxia Torrential Rain Days Under Climate Warming[J]. Climate Change Research, 2007, 03(02): 85-090.

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