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| Identify high frequent dust areas and their sources in spring in the Northwest of China |
| ZHANG Ye, WANG Hai-bing, ZUO He-jun, YAN Min |
| Key Laboratory of Aeolian Sand Physics and Sand Control Engineering in Inner Mongolia, Desert Science and Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China |
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Abstract The spatial distribution of dust frequency was extracted from MODIS L1B data of 460 days in spring from 2014~2018 in the Northwest of China by using brightness temperature difference (BTD) algorithm and dust source was identified by combining with the geomorphological type and the content of fine particles in surface sediments. The results showed that dust activity in the region is characterized as two regions and three belts in which the two regions are Tarim Basin in Xinjiang Autonomous Region and Gobi Desert of southern Mongolian plateau and the three belts are desert oasis in southeastern margin of Taklimakan Desert (270~287 times), northern margin of Kumutag Desert (240~250 times), and desert oasis in the northwestern margin of Badain Jaran Desert (240~250 times). The region with high frequency of moderate and severe dust activities is mainly located in desert oasis of the northwest margin of Taklimakan. The dust source is mainly located in the transit zones from Alluvial fan, via Gobi, to the edge of Desert filled with dry riverbed, dry lake, and degraded oasis. The surface in the region covers fine sand particles and provide rich sand material for the high-frequent and high-concentrated sand and dust. The fine particles are easy to release to atmosphere and diffuse to the surrounding region through the local dust circulation process.
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Received: 10 March 2019
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