WANG Lu-si,WANG Wei.Analysis of Spring Drought in the Southwestern China During 1951-2011[J].Journal of Chengdu University of Information Technology,2018,(06):718-722.[doi:10.16836/j.cnki.jcuit.2018.06.018]
1951-2011年西南地区春旱成因初步分析
- Title:
- Analysis of Spring Drought in the Southwestern China During 1951-2011
- 文章编号:
- 2096-1618(2018)06-0718-05
- 分类号:
- P461
- 文献标志码:
- A
- 摘要:
- 利用国家气候中心西南地区46个国家基准站1951-2011年3-5月逐月降水资料,以降水距平序列作为干旱指数,对西南地区典型春旱年和典型春涝年进行判定,分析表明:该指数能够较准确地筛选典型春旱和春涝年份。结合NCEP再分析资料,对典型年份的环流形势进行对比分析。对典型春旱年的合成分析表明:春季西南地区上空(500 hPa)受高压脊的控制,辐散气流强,是西南地区春季发生干旱的主要原因之一。之后对2009-2010典型冬春连旱年个例进行分析。
- Abstract:
- Based on the March to May's monthly precipitation data from 46 national reference stations in the southwestern China during 1951-2011,a anomalous precipitation sequence drought index is given,and the typical spring-drought years and typical spring-flood years are distinguished.With the use of these data and analyses,the index can filter typical spring-drought years from spring-flood years fairly.We use the NCEP re-analysis data analyze these typical years' characteristics of circulation. The compound analysis on typical spring-drought years shows that one of the main reason of the spring droughts in southwestern china is the strong divergent flow caused by the high pressure on 500 hPa level over this area. The typical winter-spring drought that occurred in 2009-2010 is analyzed as well.
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备注/Memo
收稿日期:2016-04-18 基金项目:国家自然基金青年基金资助项目(41005034); 公益性行业(气象)科研专研重大资助项目(GYHY201506001); 四川省教育厅重点资助项目(13Z194)