Dust Emission over Different Land Surface in the Arid Region of Northwest China

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  • SHEN Yanbo
    Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Acadmy of Sciences, Lanzhou State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing
  • SHEN Zhibao
    Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Acadmy of Sciences, Lanzhou
  • DU Mingyuan
    National Institute for Agro-Environmental Science, Tsukuba
  • WANG Wanfu
    The Conservation Institute of Dunhuang Academy

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In this paper, the main wind erosion factors influencing dust emission are analyzed by using the observed data from the gobi and oasis sites of ADEC (Aeolian Dust Experiment on Climate impact) Project in Dunhuang station in Northwest China, and the dust emission rate over the two different land surfaces are calculated by using Shao’s dust emission model. The results indicate that the threshold friction velocity over the non-ploughed cropland is larger than that over the gobi desert, while after spring ploughing, it is smaller. Dust emission rate over the ploughed cropland is largest, which is hundreds of times larger than that over the gobi desert. Over the non-ploughed cropland, dust emission rate is less than that over the ploughed cropland, but larger than that over the gobi desert, while when the friction velocity is larger than 0.8 ms−1 it is close or equal to that over the ploughed cropland.

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