Zhu Jun, Yue Xu, Zhou Hao, Che Huizheng, Xia Xiangao, Wang Jun, Zhao Tianliang, Tian Chenguang, Liao Hong
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology (NUIST), Nanjing, 210044, China.
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology (NUIST), Nanjing, 210044, China.
Sci Total Environ. 2024 Jun 1;927:172337. doi: 10.1016/j.scitotenv.2024.172337. Epub 2024 Apr 10.
Fire emissions in Southeast Asia transported to southern China every spring (March-May), influencing not only the air quality but also the weather and climate. However, the multi-year variations and magnitude of this impact on aerosol radiation forcing in southern China remain unclear. Here, we quantified the multi-year contributions of fire emissions in Indo-China Peninsula (ICP) region to aerosol radiation forcing in the various southern Chinese provinces during the fire season (March-May) of 2013-2019 combining the 3-dimension chemical transport model and the Column Radiation Model (CRM) simulations. The models' evaluations showed they reasonably capture the temporal and spatial distribution of surface aerosol concentrations and column aerosol optical properties over the study regions. The fire emissions over the ICP region were found to increase the aerosol optical depth (AOD) value by 0.1 (15 %) and reduce the single scattering albedo (SSA) in three southern regions of China (Yunnan-YN, Guangxi-GX, and Guangdong-GD from west to east), owing to increases in the proportions of black carbon (BC, 0.4 % ± 0.1 %) and organic carbon (OC, 3.0 % ± 0.9 %) within the aerosol compositions. The transported smoke aerosols cooled surface but heated the atmosphere in the southern China regions, with the largest mean reduction of -5 Wm (-3 %) in surface shortwave radiation forcing and the maximum daily contributions of about -15 Wm (-15 %) to the atmosphere radiation forcing in the GX region, followed by the GD and YN regions. The impacts of ICP fire emissions on aerosol optical and radiative parameters declined during 2013-2019, with the highest rate of 0.393 ± 0.478 Wm yr in the GX for the shortwave radiation forcing in the atmosphere. Besides, their yearly changes in the contribution were consistent with the annual fire emissions in the ICP region. Such strong radiative perturbations of ICP fire emissions were expected to influence regional meteorology in southern China and should be considered in the climate simulations.
东南亚的火灾排放物每年春季（3月至5月）都会输送到中国南方，不仅影响空气质量，还影响天气和气候。然而，这种影响对中国南方气溶胶辐射强迫的多年变化和程度仍不清楚。在此，我们结合三维化学传输模型和柱状辐射模型（CRM）模拟，量化了2013 - 2019年火灾季节（3月至5月）印度支那半岛（ICP）地区火灾排放物对中国南方各省气溶胶辐射强迫的多年贡献。模型评估表明，它们合理地捕捉了研究区域内地面气溶胶浓度和柱状气溶胶光学特性的时空分布。研究发现，ICP地区的火灾排放使中国南方三个地区（从西到东依次为云南 - YN、广西 - GX和广东 - GD）的气溶胶光学厚度（AOD）值增加了0.1（15%），并降低了单次散射反照率（SSA），这是由于气溶胶成分中黑碳（BC，0.4% ± 0.1%）和有机碳（OC，3.0% ± 0.9%）的比例增加所致。输送来的烟雾气溶胶使中国南方地区的地表冷却，但使大气升温，地表短波辐射强迫平均最大减少 - 5 Wm（-3%），在GX地区对大气辐射强迫的最大日贡献约为 - 15 Wm（-15%），其次是GD和YN地区。2013 - 2019年期间，ICP火灾排放对气溶胶光学和辐射参数的影响有所下降，大气中短波辐射强迫在GX地区的最高下降速率为0.393 ± 0.478 Wm yr。此外，它们贡献的年变化与ICP地区的年度火灾排放一致。预计ICP火灾排放如此强烈的辐射扰动会影响中国南方的区域气象，在气候模拟中应予以考虑。
