2019年—2020年秋、冬季淮南市灰霾过程拉曼-米气溶胶雷达观测研究

doi:10.3964/j.issn.1000-0593(2021)08-2484-07

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Abstract The Raman-Mie Aerosol Lidar (RMAL) has advantages over traditional Mie scattering Lidar in accurately measuring aerosol extinction coefficient without assuming radar ratios. The results of the outfield sounding comparison experiment in Hefei indicated that the extinction coefficient retrieved by RMAL below 2.5 km is more accurate than the traditional Mie scattering Lidar with a difference of up to 0.04 km^-1, obtained water vapor mixing ratio profiles were consistent well with the sounding. This study presented the long-time observational results of aerosol extinction coefficient and height of atmospheric boundary layer (ABL) data over Huainan City during the autumn and winter from 2019 to 2020 using this technology for the first time. The pollution types (local pollution discharge, transmission pollution, transmission pollution and local pollution accumulation) and spatial-temporal changes of aerosol during the air quality pollution period were analyzed and discussed. The results showed that Huainan City is affected by 20 fine particle air pollution and 8 times dust air pollution during this period. The transportation of dust mainly came from the northwest, and it generally sunk from high altitude to the ground, with a thickness of more than 2 km. The average height of ABL was more than 1.23 km. In the typical fine particle transportation process, the height of the ABL was maintained at about 1.1~1.2 km, and the ground wind direction was mainly northwest, with a small amount of southeast. In the coincidence pollution process of fine particle transmission and local accumulation, the height of ABL was slightly lower (the average height is about 1.0 km), the near-surface wind direction is dominated by northerly winds. The lower edge height of the polluted air masses continued to decrease from low altitude and eventually coupled with near-ground pollution. In the process of heavy pollution caused by fine particles, the evolution trend of surface water vapor mixing ratio, relative humidity and PM_2.5 concentration were in good agreement. This showed that increasing moisture absorption of particulate matter and secondary transformation of gaseous pollutants might promote the second generation process of PM_2.5. In particular, the trend of atmospheric boundary layer height was closely related to the settlement of polluted air masses and the accumulation of surface pollution. During the attention period, most of the city’s hourly height of ABL was distributed below 1.6 km, with an average of around 1.0 km. When the hourly air quality reached severe pollution, the height of the boundary layer was generally less than 0.6 km. According to the simulation results of the backward trajectory of the air mass, the polluted air mass mainly came from the northerly direction, with a small amount came from the southeast, during the air pollution period of the city with moderate or above pollution. Therefore, it is necessary to strengthen the management and control of pollution sources in the north of the urban area to prevent superimposed effects.

Key words：Raman-mie aerosol lidar; Haze; Dust aerosol; Huainan city; Atmospheric detection

Received: 2020-08-20 Accepted: 2020-12-24

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O433.4

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2021)08-2484-07 OR https://www.gpxygpfx.com/EN/Y2021/V41/I08/2484

[1] QIN Wei, FAN Guang-jiang, ZHANG Tian-shu, et al(秦玮, 范广强, 张天舒, 等). Journal of Atmospheric and Environmental Optics(大气与环境光学学报), 2016, 11(4): 270.
[2] TAO Zong-ming, MA Xiao-min, LIU Dong, et al(陶宗明, 麻晓敏, 刘东，等). Acta Optica Sinica(光学学报), 2016, 36(6): 0601001.
[3] WANG Yuan, DENG Jun-ying, SHI Lan-hong, et al(王苑, 邓军英, 史兰红, 等). Environmental Science(环境科学), 2014，35(3)：830.
[4] TIAN Xiao-min, LIU Dong, XU Ji-wei, et al(田晓敏, 刘东, 徐继伟, 等). Journal of Atmospheric and Environmental Optics(大气与环境光学学报), 2018, 13(5): 321.
[5] LIU Jian-guo, GUI Hua-qiao, XIE Pin-hua, et al(刘建国, 桂华侨, 谢品华, 等). Journal of Atmospheric and Environmental Optics(大气与环境光学学报), 2015, 10(2): 93.
[6] XIE Chen-bo, ZHOU Jun, YUE Gu-ming, et al(谢晨波, 周军, 岳古明, 等). Acta Optica Sinica(光学学报), 2006, 26(9): 1281.
[7] BO Guang-yu, XIE Chen-bo, LIU Dong, et al(伯广宇, 谢晨波, 刘东, 等). Chinese Journal of Lasers(中国激光), 2010, 37(10): 2526.
[8] CAO Nian-wen, YANG Feng-kai, SHI Jian-zhong, et al(曹念文, 杨丰恺, 施建中，等). Journal of Applied Optics(应用光学), 2012, 33(5): 979.
[9] WU De-cheng, LIU Bo, QI Fu-di, et al(吴德成, 刘博, 戚福弟, 等). Journal of Atmospheric and Environmental Optics(大气与环境光学学报), 2011, 6(1): 18.
[10] MA Xiao-min, TAO Zong-ming, SHAN Hui-hui, et al(麻晓敏, 陶宗明, 单会会，等). Acta Optica Sinica(光学学报), 2020, 40(11): 1101003.
[11] LANG Hong-mei, QIN Kai, YUAN Li-mei, et al(郎红梅, 秦凯, 袁丽梅，等). China Environmental Science(中国环境科学), 2016，(8): 2260.
[12] ZHOU Jing-bo, DUAN Jing-chun, WANG Jian-guo, et al(周静博，段菁春，王建国，等). Environmental Science(环境科学), 2020, 41(1): 39.