Acta Geographica Sinica ›› 2012, Vol. 67 ›› Issue (7): 951-959.doi: 10.11821/xb201207008

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Changes of the Snow Cover Days on Tibet Plateau in Last 40 Years

TANG Xiaoping1, YAN Xiaoli2, NI Maji1, LU Hongya1   

  1. 1. Climatic Center of the Tibet Autonomous Region, Lhasa 850000, China;
    2. Jiaozuo Meteorological Office, Jiaozuo 454003, Henan, China
  • Received:2011-12-26 Revised:2012-04-10 Online:2012-07-20 Published:2012-10-11
  • Supported by:

    Climate change special fund from China Meteorological Administration, No.CCSF2011-17

Abstract: By using the snow cover days data on the Tibet Plateau during the period 1971-2010, the spatiotemporal changes of the snow cover days are analyzed. The results indicate that there is a snow cover of over 60 days in the fringe area of the northeastern and southern parts of the region. The snow cover days have a significant decreasing trend in the western and southeast parts, and the largest decline is observed in Nielamu, reaching 9.2d/ 10a. The snow cover days have quasi-cycles of 2 years, 4 years, 8 years, 14 years and 17-18 years acros the region, but quasi-cycles of 2 years, 4 years and 8 years occur in the southern and western parts. There is a significant negative correlation between the snow cover days and the mean winter air temperature, while there is a significant positive correlation between the snow cover days and precipitation in the central and western parts of Nagchu, the fringe areas of the northeast and the south margins and areas along the Yarlung Zangbo River.

Key words: Tibet, changes of the snow cover days, quasi-cycles analysis