挥发性卤代烃（VHOCs）的海洋生物地球化学研究是目前国际上全球变化研究中一个非常重要的前沿领域，目前已成为IGBP中“上层海洋与低层大气研究”（SOLAS）的核心内容之一。本项目将以我国东部陆架海—东海和黄海为主要研究区域，采用海上调查、现场围隔实验、实验室培养实验和数值模拟相结合的方法，对VHOCs的源与汇、相对强度变化及其环境效应进行综合研究。具体测定VHOCs在海水中的生物生产速率、沉积物释放速率、河流输入量、VHOCs的微生物消耗速率、光化学氧化速率，对VHOCs的来源和迁移变化途径进行综合评价；认识VHOCs在海水和大气中的浓度分布、时空变化、海-气交换通量及主要影响因素；建立VHOCs在中国东部陆架海的生物地球化学循环模型；定量评价我国陆架海VHOCs的释放对区域环境的影响。通过本研究可大大提升我国在VHOCs研究领域的总体水平和国际地位。

Study on the biogeochemistry of volatile halogenated organic compounds (VHOCs) in the ocean is an international leading edge in the field of the global change research, and it has currently become one of core contents of SOLAS (Surface Ocean-Lower Atmosphere Study) in IGBP (International Geosphere and Biosphere Plan). In this project, we will choose China’s shelf seas—the East China Sea and the Yellow Sea which have been highly influenced by anthropogenic activities, as main study area, and utilize the combined approaches of the in-situ observation,.ship-based mesocosm experiments, laboratory incubation experiments, and numerical simulation to carry out a comprehensive study on the source and sink of VHOCs and their environmental effects. Particularly, we will measure the VHOCs biological production rate, the sediment emission rate, and the riverine input amounts, as well as the VHOCs microbial consumption rate and photochemical oxidation rate, and synthetically evaluate the source and sink pathways of VHOCs. Moreover, we will study the concentration distributions and spatiotemporal variations of VHOCs in the seawater and the atmosphere and the factors influencing them. The sea-to-air fluxes of VHOCs will also be calculated using the gas exchange model. This work will finally set up the biogeochemical cycling pattern of VHOCs in China’s eastern shelf sea, and quantitatively assess the influence of VHOCs released from China’s shelf sea on the local environment. This study may largely advance international level of Chinese VHOCs study.