COS和CS2是大气中重要的含硫气体，其氧化产物对云的形成和气候产生重要影响。海洋是大气中COS和CS2的天然来源，参与了全球硫循环。因此，有关海洋中COS和CS2的来源途径、浓度分布、迁移转化的研究是当今国际上的热点问题，已成为国际一些重大研究计划如上层海洋与低层大气研究（SOLAS）的重要内容。本项目将对我国东部陆架海域COS和CS2的生物地球化学进行有限目标的研究，具体测定其在海水中的生物生产速率、光化学产生速率、微生物消费速率，对COS和CS2的来源和迁移转化进行综合评价；通过春夏秋冬4个季节的调查，阐明海水和大气中COS和CS2浓度的时空变化特征及其与研究海区的物理、化学、生物因子之间的关系；估算COS和CS2的海-气交换通量，定量评价我国东部陆架海域COS和CS2的释放占全球海洋释放的比例。本研究将进一步拓宽和完善海洋硫循环的研究内容，并对全球气候变化研究做出我国独特的贡献。

Carbonyl sulfide (COS) and carbon disulfide (CS2) are important sulfur gases naturally present in the atmosphere, and their oxidation products significantly impact the formation of clouds and climate. The ocean is a natural source of atmospheric COS and CS2 and the marine emission of COS and CS2 constitutes an important component of global sulfur cycle. As such, the source, distribution, transformation and removal of COS and CS2 in the ocean have received considerable attentions, studies on which have been the hot issues of some major international research programs such as Surface Ocean-Lower Atmosphere Study (SOLAS). This project will focus on the biogeochemistry of COS and CS2 in the water columns of continental shelf seas of eastern China. Specifically, we will determine the biological production rates, photochemical production rates and microbial consumption rates of these two sulfur compounds, and systematically assess their sources and fates in the ocean. We will also investigate the spatial and seasonal variability of COS and CS2 in the seawater and overlying atmosphere during spring, summer, autumn and winter cruises, and examine physical, chemical and biological factors that control their distribution in the study area. We seek to calculate the sea-to-air exchange fluxes of COS and CS2, based on which we will quantitatively estimate the contribution of eastern China continental shelf seas to the global marine emission of COS and CS2. This study will further extend and improve our current understanding on marine sulfur cycling and make distinct contributions to the global climate change research.