北冰洋中上层水体海洋学过程，系影响北冰洋乃至全球热量分配、物质输送及气候调控的关键过程。全球变暖和北极快速冰融背景下，西北冰洋中上层水体结构与性质变化显著。开展其水体演化与传输过程的CFCs和SF6联合示踪研究，是研究快速融冰背景下中上层水体变化的有效手段之一，对于揭示北极气-冰-海系统响应机制及其在北极气候变化的关键作用，具有重要意义。.本申请拟以中国北极科学考察（2010-2022年）为依托，系统获取白令海及西北冰洋海水CFCs和SF6的全水柱分布之时间序列观测数据，据此开展如下工作：1）西北冰洋中上层水体的通风过程和来源解析；2）运用一维稳态TTD方法，定量估算其水团平均年龄、传输时间和人为碳储量；3）结合欧洲北极科学考察观测数据，准确评估北大西洋和北太平洋入流的传输路径、通风强度及时间序列变化；4）深入探究上述过程在北极气-冰-海系统对全球气候变化响应之耦合关系中的关键作用。

The hydrologic processes of the Arctic Ocean, especially for the upper and intermediate water, have great impact on its heat distribution, material transportation, climatic regulation, and even the global circulation. In the context of Arctic warming and rapid ice melting, the structure and properties of upper and intermediate water in the western Arctic change significantly. The combined application of CFCs and SF6 act as effective approach to study the evolution and transmission of water in the Arctic, which is also helpful to reveal the responsive mechanism of gas-ice-sea system and study its influence on Arctic climate change..Research of this project is going to be conducted based on the platform of the Chinese Arctic Research Expedition (2010-2022), which helps to obtain time-series data of CFCs and SF6 in full-depth water of the Bering Sea and the western Arctic Ocean..The main content of this study is as follow:.1) analyzing ventilation process and source in the upper and intermediate of western Arctic Ocean..2) using TTD method to estimate the mean age of water mass, transportation time and anthropogenic carbon inventory..3) evaluating the water transportation path, ventilation intensity and their temporal variations of Pacific Water and Atlantic Water..4) identifying the potential key role of the abovementioned processes in the coupling relationship between Arctic gas-ice-sea systems and global climate change.