Plateau Meteorology

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2016 , Vol. 35 >Issue 1: 24 - 33

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00140

Study on Variation of Snow Cover and Its Orographic Impact over Qinghai-Xizang Plateau during 2001-2012

  • GUO Jianping ,
  • LIU Huan ,
  • AN Linchang ,
  • WANG Pengxiang ,
  • GAO Mei
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  • State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;2. Natioanl Meteorological Center, China Meteorological Administration, Beijing 100081, China;3. Tibet Autonomous Region Meteorological Bureau, Lhasa 850001, China

Received date: 2013-11-20

  Online published: 2016-02-28

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Abstract

The snow cover fraction(SCF) data during the period 2001 through 2012 from MODIS aboard Terra of NASA are used to derive the spatio-temporal distribution of snow,and to calculate its variation trend over the Qinghai-Xizang Plateau(QXP) using statistic analysis methods.The SCF during the months from October through the following April dominates compared with other months.Persistent snow area reaches the maximum of 92.93×104 km2 in February.It begins to decrease gradually as of May,hits to the bottom line of 12.37×104 km2 in July.Beginning in September,SCF goes up sharply,leveling off in October.Overall,the annual mean snow area over the QXP oscillates between 55×104~80×104 km2,showing a three-year variation cycle.Also,altitude is found to be able to exert significant influence on SCF.The higher the altitude is,the higher the SCF is over most parts of the QXP except over southwest QXP.For regions below 5 km,there is a monotonic seasonal variation trend,i.e.,higher winter SCF and lower summer SCF.In contrast,for regions above 5 km,there is a bi-modal variation trend.Aspect derived from digital elevation model can exert great influence on SCF as well.Northerly aspect corresponds to the maximum SCF,followed by westerly and easterly,and then southerly aspects.This is likely due to the solar radiation difference caused by various aspects.Similarly,SCF increases rapidly with slope during October to the following April,and then almost stays invariant during May through September.

Key words： MODIS; Snow cover fraction; Snow cover; The Qinghai-Xizang P; Slope; Aspect

Cite this article

GUO Jianping , LIU Huan , AN Linchang , WANG Pengxiang , GAO Mei . Study on Variation of Snow Cover and Its Orographic Impact over Qinghai-Xizang Plateau during 2001-2012[J]. Plateau Meteorology, 2016 , 35(1) : 24 -33 . DOI: 10.7522/j.issn.1000-0534.2014.00140

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