J4 ›› 2008, Vol. 26 ›› Issue (2): 17-24.

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Prec ip ita tionVar ia tion Character istics and Ar id Clima te D iv ision in Ch ina

 YANG  Xuan, LI Dong-Liang   

  1. Nanjing University of Inform ation Science & Technology, N anjing 210044, China
  • Online:2008-06-30 Published:2008-06-30

中国干旱气候分区及其降水量变化特征

杨 绚,李栋梁   

  1. 南京信息工程大学,江苏 南京 210044
  • 作者简介:杨绚(1985 - ) ,女,辽宁朝阳市人,硕士研究生,主要从事气候变化和预测研究. E-mail: yx_221@126. com
  • 基金资助:

    科技部科研院所社会公益研究项目“中国干旱气象灾害监测预警方法研究”(2004D IB5J192)资助

Abstract:

The percentage of p recip itation anomalies and the drought grades (DG) were calculated by using the monthlymean p recip i2 tation data for the period of 1974 - 2006 from 614 stations in China. The climate regions are divided according to DG based on REOF, and the temporal evolution characteristics ofDG in each region were studied. The results show that there is obvious interdecadal varia2 bility in annual p recip itation in China, especially in northwest China. Since the 21 st century, a sharp ly increasing rainfall trend ap2 peared in the west of Xinjiang. The first eleven rotated loading vector fields ofDG rep resent eleven p rincipal p recip itation anomaly are2 as, and each marked by a dryness/wetness trend of its own. DG and the data at the rep resentative stations show that annual total p re2 cip itation has obviously decreased in northeast China, north China and Hetao area, but significantly increased in northwest China in the recent 50 years.

Key words: climate division, percentage of p recip itation anomalies, drought grades

摘要:

利用中国614个气象台站1974~2006年历年月平均降水资料,计算各站的降水量距平百分率及其干旱等级序列,采用REOF等方法,对干旱等级序列进行气候分区,并分析各区域50 a左右干旱等级的时间演变特征。结果表明:全国降水量具有显著的年代际变化特征,尤其西北地区年代际变化十分突出,其中新疆西部地区在21世纪以来降水量的增加非常明显,增加的程度也是近33 a中最强的。根据干旱等级序列的旋转载荷向量将中国划分为11个区域,它们各自具有不同的旱涝特征。干旱等级序列和代表站资料反映出近50 a东北、华北及河套地区的干旱明显加重,而西北大部分地区降水量有显著的增加

关键词: 气候分区, 降水量百分率, 干旱等级

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