Vertical distributions of tropospheric formaldehyde, nitrogen dioxide, ozone and aerosol in southern China by ground-based MAX-DOAS and LIDAR measurements during PRIDE-GBA 2018 campaign
Vertical distributions of tropospheric formaldehyde, nitrogen dioxide, ozone and aerosol in southern China by ground-based MAX-DOAS and LIDAR measurements during PRIDE-GBA 2018 campaign
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PRIDE-GBA 2018活动期间通过地面MAX-DOAS和LIDAR测量的中国南方对流层甲醛、二氧化氮、臭氧和气溶胶的垂直分布
DOI：
10.1016/j.atmosenv.2020.117384
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发表时间：
2020-04-01
影响因子：
5
通讯作者：
Liu, Wenqing
中科院分区：
文献类型：
--
作者：
Luo, Yuhan;Dou, Ke;Liu, Wenqing
随着我国特大城市的发展，大气复合污染问题日益受到关注。复合污染是由二氧化氮（NO2）等一次污染和一定气象条件下的二次污染以及对流层臭氧、甲醛、细颗粒物等高浓度前体物组成的。在PRIDE-GBA 2018 Campaign（Particles，Radicals，Intermediates from oxiDation of primary Emission in Great Bay Area）期间，我们利用遥感技术对污染气体和气溶胶进行了高分辨率垂直观测，这是研究对流层污染机制的重要但稀缺的指标。利用多轴差分吸收光谱（MAX-DOAS）数据重建了NO2和HCHO的柱密度和垂直分布。利用差分吸收光探测和测距（LIDAR）系统反演对流层臭氧廓线和气溶胶消光。为了验证其准确性，我们评估了MAX-DOAS和LIDAR测量的一致性和可靠性。计算结果与广州塔的现场观测和离线观测结果吻合较好。对9月29日至10月10日的一次典型复合污染过程进行了详细分析。在这种情况下，超过200 μ g/m（3）的对流层臭氧被认为是来自人为来源，包括工业，发电厂，住宅和交通。当地工业的高排放和东北地区的污染空气输送是这次污染过程的主要前兆。对流层臭氧的光化学形成在污染天变成VOC限制制度。
As the development of megacities, combined air pollution has been of increasing concern in China, which is composed by primary pollution, such as Nitrogen dioxide (NO2), and the followed secondary pollution under certain meteorology circumstances and high concentration of precursors, such as tropospheric ozone, formaldehyde (HCHO) and fine particles. During PRIDE-GBA 2018 Campaign (Particles, Radicals, Intermediates from oxiDation of primary Emissions in Great Bay Area), we performed the high resolution vertical observations of pollution gases and aerosol, which are significant but scarce indexes in studying the mechanisms of tropospheric pollution, using remote sensing techniques. NO2 and HCHO column densities and vertical profiles are reconstructed from data of multi-axis differential optical absorption spectroscopy (MAX-DOAS). Tropospheric ozone profile and aerosol extinction are retrieved by the differential absorption light detection and ranging (LIDAR) system. In order to verifying the accuracy, we evaluated the consistency and reliability of MAX-DOAS and LIDAR measurements. The results showed reasonable agreement with in-situ and off-line observations at Canton Tower. A typical combined pollution process from Sep 29 to Oct 10 was analyzed in detail. More than 200 mu g/m(3) tropospheric ozone in this case was considered from the anthropogenic sources, including industry, power plant, residential and transportation. The high emission from local industry and polluted air transport from northeast brought the main precursors of this pollution process. The photochemical formation of tropospheric ozone was turned into a VOC-limited regime on polluted days.