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| In-cloud scavenging characteristics of black carbon in the mountain background region of South China |
| XU Hai-bao1,2, MA Nan1,2, YANG Zheng1,2, PENG Long1,2, XIE Lin-hong1,2, HE Yao1,2, TAO Jiang-chuan1,2, HONG Juan1,2, WANG Qiao-qiao1,2, WANG Bo-guang1,2, BI Xin-hui3,4,5 |
1. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China;
2. Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511443, China;
3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
4. Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou 510640, China;
5. Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou 510640, China |
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Abstract During three typical cloud events occurred in the mountain region of South China, a ground-based counterflow virtual impactor was used to collect particulate matter in clouds. A single particle soot photometer and a fog monitor were used to analyze the black carbon (BC) concentration and cloud parameters, respectively. BC in-cloud scavenging efficiency and its influencing factors were discussed. Results showed that the proportion of in-cloud BC was about 20%. 4.67% droplets contained BC, while the proportion of BC-containing interstitial particles is 15.31%. The mass and number scavenging efficiency of BC with different particle sizes were similar, ranging from 28% to 59%. High liquid water content and cloud droplet number concentration were beneficial to the in-cloud scavenging of BC, while BC in-cloud scavenging efficiency decreased with increasing total BC concentration. The order of the influence factors of BC in-cloud scavenging efficiency was cloud droplet number concentration > liquid water content> total BC concentration.
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Received: 02 March 2022
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