Plateau Meteorology

Plateau Meteorology >

2018 , Vol. 37 >Issue 4: 899 - 910

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00099

Spatial-temporal Variability of the Snow Depth over the Qinghai-Tibetan Plateau and the Cause of Its Interannual Variation

  • BAO Yuntao ,
  • YOU Qinglong ,
  • XIE Xinru
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  • Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD); Nanjing University of Information Science and Technology(NUIST), Nanjing 210044, Jiangsu, China

Received date: 2017-06-20

  Online published: 2018-08-28

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Abstract

Based on daily snow depth observation data from National Meteorological Information Center and atmospheric circulation data from JRA55 reanalysis, the spatial-temporal variability of snow depth over the middle east area of Qinghai-Tibetan Plateau (QTP) in early winter (November to subsequent January) and late winter (February to April) during 1961-2013 was analyzed. The circulation patterns and water vapor conditions affecting the snow depth anomalies and its interannual variations over the QTP were analyzed. The results show that, interannual and interdecadal variations of snow depth over the QTP is significant. Spatial distribution of snow depth is uneven, the interannual variability of snow depth increases with the increases of altitude. Changes of the snow depth are consistent with the region in early and late winter. Trend of snow depth are not obvious in both early and late winter during 1961-2013. Snow depth increases significantly before 1996 and decreases insignificantly after 1996. The interannual variability of snow depth in early winter is likely to be dominated by interannual variations of both Arctic Oscillation (AO) and geopotential height near the QTP. In late winter, the interannual variability of snow depth is likely to be dominated by the geopotential height near the QTP and adjusted by interannual variations of AO. When snow depth over QTP is significantly positive, geopotential height anomaly from Arabian Sea to eastern QTP is negative, causing the animation of southern branch trough, westerly jet to the southern side of the plateau strengthens, increasing the water vapor flux in front of the trough. Meanwhile, the subtropical high moves northward and becomes strong, increasing the water vapor flux in its peripheral areas. Strengthening of the Lake Baikal ridge leads cold air southward and meet with warm and humid air from low-latitudes in the eastern plateau, which is conducive to more snowfall and more snow depth over the QTP.

Key words： Qinghai-Tibetan Plat; snow cover distribut; temporal and spatial; Arctic Oscillation; circulation anomaly

Cite this article

BAO Yuntao , YOU Qinglong , XIE Xinru . Spatial-temporal Variability of the Snow Depth over the Qinghai-Tibetan Plateau and the Cause of Its Interannual Variation[J]. Plateau Meteorology, 2018 , 37(4) : 899 -910 . DOI: 10.7522/j.issn.1000-0534.2017.00099

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