南极绕极流海域湍流混合的时空变异和生成机制的研究

The Antarctic Circumpolar Current (ACC) links the global ocean between different basins (the Indian Ocean, the Pacific and the Atlantic). Turbulent mixing processes in the ACC region play a central role in the Earth’s climate system and in biogeochemical cycling, as it controls the storage of heat, carbon and nutrients in the deep ocean. Based on historical in situ observation of high-resolution temperature-salinity profiles in the ACC region, such as Argo profiles, and CTD profiles from the SOOS (Southern Ocean Observing System) and the CHINARE (Chinese Arctic and Antarctic Administration). This project plans to estimate the temporal and spatial variations of the turbulent mixing in the studied region by a fine-scale parameterization method, to quantify the relations with environmental parameters, such as near-inertial wind, internal tide, Lee wave, and explore the generation mechanisms.

南极绕极流连接了世界三大洋（印度洋、太平洋和大西洋）。南极绕极流海域的湍流混合过程控制着深海热量、碳和营养物质的垂向输运，在地球气候系统和生物地球化学循环中发挥着核心作用。本项目拟收集历史观测的南极绕极流海域的高精度温盐资料，例如Argo剖面资料，南大洋观测系统和国家海洋局极地考察办公室提供的CTD数据等，结合细尺度参数化方法，分析南极绕极流海域湍流混合的时间和空间特征，在统计意义上定量给出湍流混合和近惯性风、内潮和Lee波之间的关系，探讨湍流混合受近惯性风、内潮和Lee波等影响的生成机制。

本项目基于细尺度参数化方案，利用大量的历史高分辨率的温盐数据，获得较大空间区域较长时间尺度的湍流混合率，统计研究南极绕极流湍流混合的时空变异规律，在统计意义上定量给出了湍流混合和近惯性风、地形和涡流之间的关系，探讨湍流混合受近惯性风、地形和涡流等影响的生成机制，并研究湍流混合从季节到年际变化变化特征，发现其受到SAM和ENSO调制的影响，有助于改善数值模式，从而更准确地模拟和预测海洋环流和气候变化。