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| Distribution of volatile sulfur compounds in the East China Sea during spring |
| SUN Ming-xin1, ZHANG Hong-hai1,3, MA Qian-yao1, ZHU Rong1, YANG Gui-peng1,2,3 |
1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
3. Institute of Marine Chemistry, Ocean University of China, Qingdao 266100, China |
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Abstract The distributions of three main volatile organic sulfur compounds (VSCs) including carbonyl sulfide (COS), dimethyl sulfide (DMS) and carbon disulfide (CS2) were investigated for the first time in the seawater and marine atmosphere of the East China Sea (ECS) during March-April 2017 to study the correlation between the three main VSCs and their sea-to-air fluxes. The results showed that the average concentrations of COS, DMS and CS2 in the surface seawater were (1.0±0.4), (6.8±6.8) and (0.6±0.4) nmol/L, respectively. In general, the distributions of the three VSCs exhibited a decreasing trend from inshore to offshore sites. The concentration of DMS was significantly correlated with that of Chl-a, suggesting that phytoplankton biomass might play a crucial role in dominating the distribution of DMS in the study area. Moreover, a positive correlation between CS2 and DMS was observed, indicating that they might have some similar production patterns. The average concentrations of COS, DMS and CS2 in the atmosphere were (294.7±158.8), (22.7±18.0) and (108.8±88.1)×10-12, respectively. The levels of VSCs in the coastal atmosphere were obviously higher than those over the open sea. The average sea-to-air fluxes of COS, DMS and CS2 were estimated to be (4.0±3.4), (25.8±33.8) and (2.6±2.9) μmol/(m2⋅d) during this investigation, suggesting that the East China Sea acted as an important source for atmospheric VSCs in spring.
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Received: 27 September 2017
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