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《Scientia Geographica Sinica》 2004-04
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Multiscale Studies on Climatic Change and It′s Spatial Heterogeneity in Recent 40 Years: a Case Study in Inner Mongolia

LU Yun-Ge, LI Shuang-Cheng, CAI Yun-Long (Department of Resources and Environmental Geosciences/The Center for Land Study, Peking University, Beijing 100871; Laboratory for Earth Surface Processes, the Ministry of Education, Beijing 100871)  
After analyzing average annual temperature and precipitation of the 27 meteorological stations in Inner Mongolia from 1956 to 1995 using wavelets transformation, the authors draw following conclusions. (1) The coldest period was from 1956-1958 and there were two main accretion periods of both air temperature and precipitation at the beginning of the 1960s and 1990s. Observed from large scale of time, i.e. between 36 years and 40 years, both air temperature and precipitation were in the state of relatively high values. Meanwhile, temperature had an increasing trend while some meteorological stations' precipitation was gradually decreasing. On the moderate scale and small scale of time, i.e., between 16 years and 20 years and between 4 years and 8 years, air temperature and precipitation both had more varying forms embodied in their changing frequency and fluctuation intensity. (2) Based on multiscale characters of air temperature and precipitation respectively, the authors use some numeric numbers to describe those characters and sort the meteorological stations as four types. This paper shows the spatial patterns of air temperature and precipitation change using the ordinary Kriging interpolating method. The spatial pattern of air temperature change of Inner Mongolia has the trend of varying with latitude while the spatial pattern of precipitation change has the rough trend of varying with longitude. (3) In the end, the dry-humid features from March to May of Inner Mongolia are studied in this article that include two humid periods happened at the end of the 1950s and in 1980-1982 and a driest period happened after 1994. On the large scale, a clear trend of turning from humidity to dryness can be detected. On the moderate scale and small scale, the change between humidity and dryness are relatively frequent.
【Fund】: 国家重点基础研究发展规划项目(G1998040816)。
【CateGory Index】: P467
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