Characteristics, seasonal variations, and dry deposition fluxes of carbonaceous and water-soluble organic components in atmospheric aerosols over China's marginal seas

Sen Zhao; Jianhua Qi; Xue Ding

doi:10.1016/j.marpolbul.2023.114940

Characteristics, seasonal variations, and dry deposition fluxes of carbonaceous and water-soluble organic components in atmospheric aerosols over China's marginal seas

Mar Pollut Bull. 2023 Jun:191:114940. doi: 10.1016/j.marpolbul.2023.114940. Epub 2023 Apr 21.

Authors

Sen Zhao¹, Jianhua Qi², Xue Ding¹

Affiliations

¹ Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
² Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China. Electronic address: qjianhua@ouc.edu.cn.

PMID: 37087828
DOI: 10.1016/j.marpolbul.2023.114940

Abstract

A total of 37 atmospheric aerosol samples were collected over the Yellow and Bohai Seas (YBS) during four cruises in autumn, winter, spring and summer from 2017 to 2018. The concentrations of organic carbon (OC) and water-soluble organic carbon (WSOC) ranged from 1.04 to 15.43 μg m^-3 and 0.77-5.49 μg m^-3, respectively, with higher values in autumn and winter than in spring and summer. WSOC contributed 68.49 % to OC in summer and 34.55 % in winter and was affected by temperature and relative humidity. Dicarboxylic acid showed a predominance of oxalic acid followed by malonic and then succinic acids. The contributions of secondary sources to OC and WSOC were 54 % and 65.3 %, respectively, indicating the importance of secondary aging in improving the water solubility of OC. The dry deposition flux of WSOC over the YBS was estimated to be 0.87 mg m^-2 d^-1, which might play a potential role in the marine carbon cycle.

Keywords: Dry deposition flux; Marine aerosols; OC; Seasonal variation; Source; WSOC.

MeSH terms

Aerosols / analysis
Air Pollutants* / analysis
Carbon / analysis
China
Environmental Monitoring
Particulate Matter* / analysis
Seasons

Substances

Particulate Matter
Air Pollutants
Aerosols
Carbon