CAS Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, China; Shandong Key Laboratory of Coastal Environmental Processes, Yantai, Shandong 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China.
CAS Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, China; Shandong Key Laboratory of Coastal Environmental Processes, Yantai, Shandong 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, Shandong 266071, China.
Sci Total Environ. 2023 Jun 10;876:162715. doi: 10.1016/j.scitotenv.2023.162715. Epub 2023 Mar 11.
In this research, the atmospheric dry and wet deposition fluxes of particulate organic carbon (POC) over the coastal waters around the Yangma Island in North Yellow Sea were investigated. Combining the results of this research and previous reports about the wet deposition fluxes of dissolved organic carbon (DOC) in precipitation (F) and dry deposition fluxes of water-dissolvable organic carbon in atmospheric total suspended particles (F) in this area, a synthetic assessment of the influence of atmospheric deposition on the eco-environment was conducted. It was found that the annual dry deposition flux of POC was 1097.9 mg C m a, which was approximately 4.1 times that of F (266.2 mg C m a). For wet deposition, the annual flux of POC was 445.4 mg C m a, accounting for 46.7 % that of F (954.3 mg C m a). Therefore, atmospheric POC was mainly deposited through dry process with the contribution of 71.1 %, which was contrary to the deposition of DOC. Considering the indirect input of organic carbon (OC) from atmospheric deposition, that is, the new productivity supported by nutrient input from dry and wet deposition, the total OC input from atmospheric deposition to the study area could be up to 12.0 g C m a, highlighting the important role of atmospheric deposition in the carbon cycling of coastal ecosystems. The contribution of direct and indirect input of OC through atmospheric deposition to the dissolved oxygen consumption in total seawater column was assessed to be lower than 5.2 % in summer, suggesting a relatively smaller contribution to the deoxygenation in summer in this region.
本研究调查了黄海北部羊马岛周边海域大气干湿沉降颗粒有机碳（POC）通量。结合本研究结果和该地区以往报道的降水溶解有机碳（DOC）湿沉降通量（F）和大气总悬浮颗粒物中水溶性有机碳的干沉降通量（F），对大气沉降对生态环境的影响进行了综合评价。结果表明，POC 的年干沉降通量为 1097.9mg C m a，约为 F（266.2mg C m a）的 4.1 倍。对于湿沉降，POC 的年通量为 445.4mg C m a，占 F（954.3mg C m a）的 46.7%。因此，大气 POC 主要通过干沉降过程沉积，贡献了 71.1%，这与 DOC 的沉降情况相反。考虑到大气沉降带来的有机碳（OC）的间接输入，即干、湿沉降输入的营养物质所支持的新生产力，大气沉降向研究区输入的总 OC 可达 12.0g C m a，突出了大气沉降在沿海生态系统碳循环中的重要作用。评估大气沉降中直接和间接输入的 OC 对总海水柱溶解氧消耗的贡献，在夏季低于 5.2%，表明在该地区夏季对缺氧的贡献相对较小。
