西北地區東部旱澇氣候特征
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P426.614 P444

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Drought/Flood Climatic Features over Eastern Northwest China
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    摘要:

    利用中國氣象科學研究院收集、整理的西北地區東部代表站1470~2003年的旱澇等級資料,根據不同的地形地貌特征和氣候特征,將西北地區東部分為3個氣候區,利用周期分析、coif3小波變換等統計分析方法對3個氣候區534年旱澇指數的年代際氣候特征及地域之間旱澇變化的差異進行分析.結果表明,西北地區東部不同區域旱澇的時空分布特征不盡相同,旱澇演變趨勢、旱澇周期變化既有一致性,也存在明顯的差異.534年以來北部、中部由偏旱趨于正?;蚱珴?南部1724年以前的變化趨勢由偏旱趨于偏澇,1724年以后由偏澇趨于偏旱;3個氣候區都存在25年和10年的顯著周期,其中中部還存在14~15年的顯著周期,說明中部旱澇交替較北部和南部明顯.

    Abstract:

    Using the drought/flood data from representative stations over the eastern Northwest China from 1470 to 2003 collected by the Chinese Academy of Meteorological Sciences, according to different features of terrain, physiognomy and climate, the eastern Northwest China is divided into three climatic regions. By means of statistic methods such as periodic analysis and coil3 wavelet transform, an analysis is made of the decadal variation of drought/flood index in three climatic regions and the difference among them. Results indicate that the spatial and temporal distribution features of drought/flood in three regions are different, and the variation trend and periods not only show consistency, but also exist obvious difference. The drought climate tended gradually to be normal or became wet in the north and the central parts of the area in past 534 years. From 1470 to 1724, the drought climate in the south part tended to be wet. However, after 1724, the wet climate became dry again. There are notable periods of 25 and 10 years in drought/flood in the three regions, respectively. In addition, there are obvious periods of 14 to 15 years in the central part. It is illustrated that the alternation of droughts and floodd is more distinct in the central part than those in the north and south parts.

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黃祖英 王繁強 胡春娟.西北地區東部旱澇氣候特征[J].氣象科技,2006,34(3):266~270

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  • 收稿日期:2005-01-11
  • 定稿日期:2005-04-11
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