地理学报

地理学报 ›› 2003, Vol. 58 ›› Issue (7s): 38-48.doi: 10.11821/xb20037s005

• 极端事件 • 上一篇    下一篇

内蒙古大(暴)雪的区域特征

江毅,钱维宏   

  1. 北京大学物理学院大气科学系，北京 100871
  • 收稿日期:2003-04-07 修回日期:2003-05-11 出版日期:2003-12-25 发布日期:2003-12-25
  • 作者简介:江毅 (1982-), 男, 北京大学物理学院大气科学系。Email: yjiang@pku.edu.cn Tel: 010-62764740
  • 基金资助:

    国家基础发展规划项目(No. G1999043405)

Regional Characteristics of Heavy Snowfall or Snowstorm in Inner Mongolia

JIANG Yi, QIAN Weihong   

  1. Department of Atmospheric Science, College of Physics, Peking University, Beijng 100871, China
  • Received:2003-04-07 Revised:2003-05-11 Online:2003-12-25 Published:2003-12-25
  • Supported by:

    National Key Project for Basic Sciences, No. G1999043405

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被引次数

37

摘要：

利用1961年10月~1998年3月期间每年10月至次年3月内蒙古111个测站日降雪量 ≥5 mm的资料，经统计分析和旋转经验正交函数(REOF)分析，阐述了内蒙古大 (暴) 雪 的区域特征。结果表明：(1) 内蒙古大 (暴) 雪的异常发生区与降雪量高值区一致。(2) 降雪异常最突出的区域主要集中在40~45oN，105~123oE范围内。(3) 前冬期(10~11月) 的降雪异常变化对冬季 (10~次年3月) 总降雪异常变化贡献最大，后冬期 (2~3月) 次之，隆冬期 (12~次年1月) 最少。

关键词: 大 (暴) 雪, 冬季, 变率, REOF, 内蒙古

Abstract:

Annual mean monthly snowfall series are analyzed by using daily snowfall (≥5 mm) data of 111 meteorological observations in Inner Mongolia from each year during October 1961 to March 1998. October to the next March is defined as a more objective winter for describing the variation of heavy snowfall or snowstorm in Inner Mongolia. According to such a definition, distributions of heavy snowfall or snowstorm and its varibility in Inner Mongolia are analyzed. Finally spatial patterns of the variation of the snowfall anomaly and their corresponding time variable scales are examined with REOF decomposition. It was found that: (1) the anomalies of the occurrence of heavy snowfall or snowstorm in Inner Mongolia correlate positively to the snowfall itself; (2) the key regions with large variability are located mainly within 40-45oN and 105-123oE; (3) the anomalies of snowfall in winter are mostly attributed to the variation of early winter, secondly to that of late winter and least to that of midwinter; and (4) the heavy snowfall and snowstorm is characterized by a decadal-scale variation.

Key words: heavy snowfall or snowstorm, winter, variability, REOF