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| Variation in aerosol optical depth over the typical cities in the Xinjiang region |
| HU Jun1, ZHONG Ke1, KANG Yan-ming1, CHEN Yong-hang1,2, YANG Feng-juan1, LIU Qiong1, ZHANG Hua3 |
1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;
2. Institute of Desert Meteorology, China Meteorological Administration, Xinjiang Urumqi 830002, China;
3. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological, Beijing 100081, China |
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Abstract Eleven representative urban areas in the Xinjiang region were selected for classification based on Aqua-MODIS C006 aerosol daily product data from 2006 to 2017, and the variations in AOD were studied for the 11cities in Xinjiang. The results showed that the AOD decreased in different degrees except in Urumqi during 2006 to 2017. On the contrary, AOD for the Urumqi area varied in a small increase during the same period. The average annual decline of AOD in the northern Xinjiang cities was relatively small, the AOD for Turpan decreased by 0.13 during the 12 years, which was the largest decline in the Hami and Yanqi urban agglomerations at the same latitude. The average annual decline of AOD in the southern Xinjiang cities was the most significant, the AODs decreased by 0.18, 0.16, 0.16 and 0.09 in Aksu, Kashgar, Hotan and Ruoqiang, respectively. The peak of the spatial distribution of AOD was in the southern Xinjiang, with an annual average higher than 0.50, and the annual average values of AOD in the northern and eastern Xinjiang were maintained at about 0.20 to 0.22. Meanwhile, AOD had seasonal variation characteristics, with a peak in spring, followed by summer, autumn and winter. In addition, the AOD decreased in different degrees in the Xinjiang region in the past 12 years, the source area of dust aerosols in the southern Xinjiang was the main area of AOD decline, and the reduction area showed a belt shape along the Kunlun Mountains from south to north.
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Received: 08 April 2019
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