Triplet State Formation of Chromophoric Dissolved Organic Matter in Atmospheric Aerosols: Characteristics and Implications
- 1School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China
- 2Environment Research Institute, Shandong University, Qingdao, 266237, China
- 3School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
- 4Department of Building Science, School of Architecture, Tsinghua University, Beijing, 100084, China
- 5College of Resource and Environment, Anhui Science and Technology University, 233100, Anhui, China
- 6State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
- 7College of Resources and Environment, University of Chinese Academy of Sciences, 100190, Beijing, China
- 8Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
- 1School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China
- 2Environment Research Institute, Shandong University, Qingdao, 266237, China
- 3School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
- 4Department of Building Science, School of Architecture, Tsinghua University, Beijing, 100084, China
- 5College of Resource and Environment, Anhui Science and Technology University, 233100, Anhui, China
- 6State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
- 7College of Resources and Environment, University of Chinese Academy of Sciences, 100190, Beijing, China
- 8Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
Abstract. There is chromophore dissolved organic matter (CDOM) in the atmosphere, which may form triplet-state chromophoric dissolved organic matter (3CDOM*) to further driving the formation of reactive oxygen species (ROS) under solar illumination. 3CDOM* contributes significantly to aerosol photochemistry and plays an important role in aerosol aging. We quantify the ability to form 3CDOM* and drive the formation of ROS by primary, secondary and ambient aerosols. Biomass combustion has the strongest 3CDOM* generation capacity and the weakest vehicle emission capacity. Ambient aerosol has a stronger ability to generate 3CDOM* in winter than in summer. Most of the triplet states generation conform to first-order reaction, but some of them do not due to the different quenching mechanism. The structural-activity relationship between the CDOM type and the 3CDOM* formation capacity shows that the two types of CDOM identified, which similar to the nitrogen-containing chromophores contributed 88 % to the formation of 3CDOM*. The estimated formation rate of 3CDOM* can reach ~ 100 μmol m−3 h−1 in the atmosphere in Xi'an, China, which is approximately one hundred thousand-times the hydroxyl radical (•OH) production. This study verified that 3CDOM* drives at least 30 % of the singlet oxygen (1O2) and 31 % of the •OH formed by aerosols using the spin trapping and electron paramagnetic resonance technique.
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Qingcai Chen et al.
Interactive discussion


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RC1: 'Review of Triplet State Formation of Chromophoric Dissolved Organic Matter in Atmospheric Aerosols: Characteristics and Implications', Anonymous Referee #2, 24 Feb 2020
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AC3: 'Response for Anonymous Referee #2', qingcai chen, 18 Mar 2020
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AC3: 'Response for Anonymous Referee #2', qingcai chen, 18 Mar 2020
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RC2: 'Reviewer comments and feedback of Chen et al. ACPD', Anonymous Referee #1, 25 Feb 2020
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AC1: 'Response for Anonymous Referee #1', qingcai chen, 18 Mar 2020
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AC1: 'Response for Anonymous Referee #1', qingcai chen, 18 Mar 2020
Interactive discussion


-
RC1: 'Review of Triplet State Formation of Chromophoric Dissolved Organic Matter in Atmospheric Aerosols: Characteristics and Implications', Anonymous Referee #2, 24 Feb 2020
-
AC3: 'Response for Anonymous Referee #2', qingcai chen, 18 Mar 2020
-
AC3: 'Response for Anonymous Referee #2', qingcai chen, 18 Mar 2020
-
RC2: 'Reviewer comments and feedback of Chen et al. ACPD', Anonymous Referee #1, 25 Feb 2020
-
AC1: 'Response for Anonymous Referee #1', qingcai chen, 18 Mar 2020
-
AC1: 'Response for Anonymous Referee #1', qingcai chen, 18 Mar 2020
Qingcai Chen et al.
Qingcai Chen et al.
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