Spatio-temporal variations and trends of MODIS C6.1 Dark Target and Deep Blue merged aerosol optical depth over China during 2000–2017
Spatio-temporal variations and trends of MODIS C6.1 Dark Target and Deep Blue merged aerosol optical depth over China during 2000–2017
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DOI：
10.1016/j.atmosenv.2019.116846
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发表时间：
2019-10
影响因子：
5
通讯作者：
Guangqi Xie;Mi Wang;Jun Pan;Ying Zhu
中科院分区：
文献类型：
--
作者：
Guangqi Xie;Mi Wang;Jun Pan;Ying Zhu
利用NASA联合反演的MODIS Dark Target和Deep Blue气溶胶光学厚度资料，分析了2000 - 2017年中国大陆气溶胶光学厚度的变化趋势。着重描述了亚洲沙尘主要源区之一的新疆南疆盆地沙漠地区气溶胶光学厚度的分布和变化。为了研究中国气溶胶光学厚度的季节和年际变化趋势，对18年来中国气溶胶光学厚度各点进行了线性趋势分析。分析了气溶胶光学厚度与地形、GDP和人口密度的相关性。结果如下。(1)在中国，气溶胶光学厚度的全年最高值（τ M O D I S> 0.5 0）出现在四川盆地、两湖平原、华北、长江三角洲、珠江三角洲、关中平原和京津冀都市圈。特别是南疆盆地不是高值中心。气溶胶光学厚度的全年低值（τ M O D I S< 0.20）出现在川西北、藏东南、青藏高原、新疆北方、山西、甘肃和内蒙古。(2)2000年至2017年，中国上空的气溶胶光学厚度随年份变化，在前十年有所增加，但从2011年开始逐渐减少。(3)气溶胶光学厚度随季节变化较明显，春夏气溶胶光学厚度较高，秋冬气溶胶光学厚度较低。(4)AOD与数字高程模型呈负相关，斯皮尔曼相关系数为-0.733; AOD与GDP和人口密度呈正相关，斯皮尔曼相关系数分别为0.698和0.688。
The variations and trends of the AOD (aerosol optical depth, at 550 nm) from 2000 to 2017 in mainland China were analyzed in this paper with monthly, seasonal, and yearly mean data, derived from the NASA combined MODIS Dark Target and Deep Blue AOD retrievals. Particularly, the distribution and variation of AOD over the desert region of the southern Xinjiang basin which is one of the major Asian dust sources was described. To investigate the seasonal and yearly variation trends of the AOD over China, the linear trend was analyzed for each point during the 18 years. The correlations between AOD and terrain, Gross Domestic Product and Population Density were also analyzed. The results were as follows.(1) In China, the all-year high value (τ M O D I S> 0.50) of the AOD occurred in the Sichuan basin, the Two Lakes Plain, North China, the Yangtze River Delta, the Pearl River Delta, the Guangzhong Plain, and the Jingjinji Metropolitan Region. In particular, the southern Xinjiang basin is not the high value center. While the all-year low value (τ M O D I S< 0.20) of the AOD occurred in Northwest Sichuan, Southeast Xizang, the Qinghai-Xizang Plateau (Tibetan Plateau), Northern Xinjiang, Shanxi, Gansu, and Inner Mongolia.(2) The AOD over China varied with years from 2000 to 2017, which increased in the previous decade but gradually decreased from 2011.(3) The AOD changed more significantly with the seasons, with higher AOD in spring and summer, and lower in autumn and winter.(4) The AOD was negatively associated with Digital Elevation Model, with a Spearman correlation coefficient of− 0.733, which was positively associated with Gross Domestic Product and Population Density, with Spearman correlation coefficients of 0.698 and 0.688.