Liu Hai-Zhi, Guo Hai-Yan, Ma Zhen-Feng, Xu Hui, Bao Hong-Jun, Xu Cheng-Peng
National Meteorological Center, Beijing 100081, China.
Sichuan Climate Center, Chengdu 610072, China.
Huan Jing Ke Xue. 2019 Sep 8;40(9):3886-3897. doi: 10.13227/j.hjkx.201901144.
Based on the latest monthly data of moderate resolution imaging spectroradiometer (MODIS)/Terra C6.1 aerosol optical depth (AOD), the temporal-spatial distribution and variability trend in AOD over China during 2001-2017 are analyzed to explore the distribution and variation characteristics of AOD in China. Regarding the spatial characteristics, the first prominent high-value center of the annual mean AOD was located in the industrially and economically developed areas of the North China Plain, Central China, the Yangtze River Delta region, the Pearl River Delta region, and the Sichuan Basin. The second prominent high-value center of the annual mean AOD was located in the dust aerosol-dominated areas of Taklimakan Desert. Two low-value centers of the annual mean AOD were located in the eastern part of Inner Mongolia to the north of Northeast China and the Tibet Plateau. Regarding the temporal characteristics, the AOD value peaked in eight areas in spring and summer. The annual mean AOD values in the Taklimakan Desert, Sichuan Basin, and Pearl River Delta peaked from March to May, and those in the North China Plain, Central China, and Yangtze River Delta peaked from May to July. The trend characteristics showed that during 2001-2006, the AOD in Northwest China and Inner Mongolia showed a downtrend, and that in the east-central China and the eastern part of southwest China showed a growth trend. During 2007-2012, the trend of AOD in the Tibetan Plateau and the Taklimakan Desert changed from decreasing to increasing. The growth trend of AOD in the North China Plain and the Sichuan Basin was weakened, and the AOD in the Yangtze River Delta showed a weak downward trend. During 2013-2017, the AOD in most areas of China showed a significant downward trend.
基于中分辨率成像光谱仪（MODIS）/Terra C6.1气溶胶光学厚度（AOD）的最新月度数据，分析了2001 - 2017年中国AOD的时空分布及变化趋势，以探究中国AOD的分布和变化特征。在空间特征方面，年平均AOD的第一个显著高值中心位于华北平原、华中、长江三角洲地区、珠江三角洲地区和四川盆地等工业和经济发达地区。年平均AOD的第二个显著高值中心位于以沙尘气溶胶为主的塔克拉玛干沙漠地区。年平均AOD的两个低值中心位于中国东北北部内蒙古东部和青藏高原。在时间特征方面，AOD值在春季和夏季的八个地区达到峰值。塔克拉玛干沙漠、四川盆地和珠江三角洲的年平均AOD值在3月至5月达到峰值，华北平原、华中地区和长江三角洲的年平均AOD值在5月至7月达到峰值。趋势特征表明，2001 - 2006年，中国西北地区和内蒙古的AOD呈下降趋势，而华东地区和西南地区东部呈增长趋势。2007 - 2012年，青藏高原和塔克拉玛干沙漠的AOD趋势由下降变为上升。华北平原和四川盆地AOD的增长趋势减弱，长江三角洲的AOD呈微弱下降趋势。2013 - 2017年，中国大部分地区的AOD呈显著下降趋势。
