Acta Geographica Sinica ›› 2013, Vol. 68 ›› Issue (1): 82-94.doi: 10.11821/xb201301010

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Climate change on southern slope of Mt. Qomolangma region in Nepal from 1971 to 2009

QI Wei1,2, ZHANG Yili1, GAO Jungang1, YANG Xuchao3, LIU Linshan1, Narendra R. KHANAL4   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Institute of Meteorology, Zhejiang Meteorological Bureau, Hangzhou 310017, China;
    4. Central Department of Geography, Tribhuvan University, Kathmandu, Nepal
  • Received:2012-08-27 Revised:2012-10-21 Online:2013-01-20 Published:2013-03-19
  • Supported by:

    The National Basic Research Program of China, No.2010CB951704; National Natural Science Foundation of China, No.40901057

Abstract: Based on monthly mean, maximum, minimum air temperature and monthly mean precipitation data from 10 meteorological stations on the southern slope of Mt. Qomolangma region in Nepal from 1971 to 2009, using climatic linear trend, Sen's Slope Estimates and Mann-Kendall Test analysis methods, this paper analyzed the spatial-temporal characteristics of climatic change in this region. It also made an comparative analysis with the northern slope of Mt. Qomoangma region to clarify the characteristics and trend of climatic change in the entire Mt. Qomoangma region. The results are shown as follows. (1) The annual mean temperature in this region during the period 1971-2009 was 20.0℃, and the rising rate of annual mean temperature was 0.25℃/10a. The temperature increase was mainly due to the maximum temperature rise in this region. On the contrary, the temperature increase of the northern slope of Mt. Qomoangma region was mainly owing to the minimum temperature rise. In 1974 and 1992, the temperature rose significantly, especially in February and September. (2) The precipitation had an asymmetric distribution; the annual precipitation was 1729.01 mm from 1971 to 2009. In this region the annual precipitation had an increasing rate of 4.27 mm/a, but it was not significant. Besides, the characteristic change of monthly or seasonal precipitation was not significant. (3) The annual precipitation in this region was more than that of the northern slope of Mt. Qomoangma region as the result of the combined influences of warm-wet flow and the Mt. Qomoangma barrier. (4) The dependence of climate warming on altitude is not significant in this region where the trend of climate warming is not as significant as that on the northern slope of Mt. Qomoangma.

Key words: climate change, Mann-Kendall analysis, Mt. Qomoangma region, Koshi River, Nepal