Meteorological and anthropogenic contributions to changes in the Aerosol Optical Depth (AOD) over China during the last decade
Meteorological and anthropogenic contributions to changes in the Aerosol Optical Depth (AOD) over China during the last decade
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DOI：
10.1016/j.atmosenv.2023.119676
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发表时间：
2023-03
影响因子：
5
通讯作者：
G. de Leeuw;Han-qing Kang;C. Fan;Zhengqiang Li;Chenwei Fang;Ying Zhang
中科院分区：
文献类型：
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作者：
G. de Leeuw;Han-qing Kang;C. Fan;Zhengqiang Li;Chenwei Fang;Ying Zhang
为了减少中国的空气污染，在过去的二十年里，已经实施了一系列降低气溶胶和痕量气体浓度的措施。这些措施对气溶胶浓度的影响，在这里用卫星反演的气溶胶光学厚度表示，通过比较2010年至2021年在五个代表性地区观测到的气溶胶光学厚度时间序列，评估了这些措施的效果，模型模拟使用固定到2010年的排放量，但使用实际气象数据。因此，模型AOD只受气象条件的影响，与卫星AOD的比较允许分离的气象和人为的贡献的AOD。模型数据显示了气象因素对气溶胶光学厚度变化的影响，在+10%（不利，导致气溶胶光学厚度增加）和-10%（有利，导致气溶胶光学厚度减少）之间。不利的气象条件抵消了排放控制措施的效果。卫星数据显示，由于气象影响，2014年在三个地区出现了AOD最大值。AOD的减少，变化在22%和40%之间，主要是由于人为的影响，但气象的贡献是巨大的，并在五个重点区域之间变化。卫星和模式数据还显示，在2017-2021年期间，气溶胶光学厚度的减少趋于平缓，气溶胶光学厚度在这些年平均值的10%以内波动，气象因素的贡献很大。这一分析表明，清洁空气三年行动计划不如清洁空气行动计划有效。
To reduce air pollution over China, a series of measures to decrease concentrations of aerosols and trace gases has been implemented during the last two decades. The effects of these measures on aerosol concentrations, represented here by satellite-retrieved Aerosol Optical Depth (AOD), were evaluated by comparison of observed AOD time series from 2010 to 2021, over five representative areas, with model simulations using emissions fixed to those in 2010, but with actual meteorological data. Thus, model AOD was only influenced by meteorological conditions and the comparison with satellite AOD allows for the separation of meteorological and anthropogenic contributions to the AOD. The model data shows the influence of meteorological factors on the variation of the AOD, between +10% (unfavorable, leading to AOD increase) and −10% (favorable, leading to AOD decrease). Unfavorable meteorological conditions counteract effects of emission control measures. The satellite data show the occurrence of an AOD maximum in 2014 over three areas due to meteorological effects. The decrease of the AOD, varying between 22% and 40%, is mostly due to anthropogenic effects, but meteorological contributions are substantial and vary between the five focus regions. The satellite and model data also show that during 2017–2021 the AOD reduction flattened and AOD fluctuated within 10% of the average value for these years, with a substantial meteorological contribution. This analysis suggests that the Three-year Action Plan for Clean Air was less effective than the Clean Air Action Plan.