[快闪报告]COVID-19不同时期我国大气气溶胶负荷变化及影响因素

COVID-19不同时期我国大气气溶胶负荷变化及影响因素
编号:3510 稿件编号:454 访问权限:私有 更新:2023-04-16 15:05:35 浏览:333次 快闪报告

报告开始:2023年05月06日 14:35 (Asia/Shanghai)

报告时间:5min

所在会议:[14B] 14B、气溶胶与大气环境 » [14B-1] 14B-1 气溶胶与大气环境

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摘要
Anthropogenic emissions reduced sharply in the short-term during the coronavirus disease pandemic (COVID-19). As COVID-19 is still ongoing, changes in atmospheric aerosol loading over China and the factors of their variations remain unclear. In this study, we used multi-source satellite observations and reanalysis datasets to synergistically analyze the spring (February–May) evolution of aerosol optical depth (AOD) for multiple aerosol types over Eastern China (EC) before, during and after the COVID-19 lockdown period. Regional meteorological effects and the radiative response were also quantitatively assessed. Compared to the same period before COVID-19 (i.e., in 2019), a total decrease of −14.6% in tropospheric TROPOMI nitrogen dioxide (NO2) and a decrease of−6.8 % in MODIS AOD were observed over EC during the lockdown period (i.e., in 2020). After the lockdown period (i.e., in 2021), anthropogenic emissions returned to previous levels and there was a slight increase (+2.3 %) in AOD over EC. Moreover, changes in aerosol loading have spatial differences. AOD decreased significantly in the North China Plain (−14.0 %, NCP) and Yangtze River Delta (−9.4 %) regions, where anthropogenic aerosol dominated the aerosol loading. Impacted by strong wildfires in Southeast Asia during the lockdown period, carbonaceous AOD increased by +9.1 % in South China, which partially offset the emission reductions. Extreme dust storms swept through the northern region in the period after COVID-19, with an increase of +23.5 % in NCP and+42.9% in Northeast China (NEC) for dust AOD. However, unfavorable meteorological conditions overwhelmed the benefits of emission reductions, resulting in a+20.1% increase in AOD in NEC during the lockdown period. Furthermore, the downward shortwave radiative flux showed a positive anomaly due to the reduced aerosol loading in the atmosphere during the lockdown period. This study highlights that we can benefit from short-term controls for the improvement of air pollution, but we also need to seriously considered the cross-regional transport of natural aerosol and meteorological drivers.
关键字
Aerosol optical depth,Anthropogenic aerosol,Natural aerosol,Meteorological drivers,Radiative flux
报告人
梁苑新
中国气象科学研究院

稿件作者
梁苑新 中国气象科学研究院
车慧正 中国气象科学研究院
桂柯 中国气象科学研究院
李雷 中国气象科学研究院
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