Regional Characteristics of Heavy Snowfall or Snowstorm in Inner Mongolia
Received date: 2003-04-07
Revised date: 2003-05-11
Online published: 2003-12-25
Supported by
National Key Project for Basic Sciences, No. G1999043405
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
JIANG Yi, QIAN Weihong . Regional Characteristics of Heavy Snowfall or Snowstorm in Inner Mongolia[J]. Acta Geographica Sinica, 2003 , 58(7s) : 38 -48 . DOI: 10.11821/xb20037s005
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