南海西部涡旋对局地海气相互作用的影响

Oceanic mesoscale eddies play important roles in fluid dynamics as well as the transport of heat, salt, mass, momentum and other chemical properties in the ocean, and therefore affect circulation structure, water mass distribution, and marine organism patterns. But it has been less clear, however, how strongly the ocean and atmosphere interact on the mesoscale eddies. This study will examine the distribution, variation, dynamical mechanism and the environmental effects of mesoscale eddies in the Western South China Sea (WSCS). The mesoscale eddy and its impact on local air-sea interaction will be studied thoroughly as a main focus of this proposal. Using combined observational dataset, satellite altimeter data and high-resolution model outputs, as well as an automated eddy detection scheme, heat advection effect of warm eddy current during its propagation and evolution will be examined. The analysis will based on the identification of all warm and cold eddies in the WSCS. For each warm eddy, the atmospheric conditions associated with eddy, wind speed and direction, cloud fraction, liquid cloud water and precipitation will be examined to find out the imprint of mesoscale eddies in the WSCS. In order to test the importance of the oceanic eddy on the regional air-sea interactions, the control and the perturbed experiments are proposed to run in the regional coupled air-sea model. In addition, we will try to find a general dynamic and thermodynamic mechanism of air-sea interactions over the warm eddy according to previous studies and our study. The possible outcome of this study that the mesoscale eddy affects the local air-sea interaction in the WSCS would advance our understanding inconsiderations of the mesoscale eddy in the air-sea interactions and climate forecasts.

中尺度涡是物理海洋的重要组成部分，不仅对海洋热、动力过程以及生物地球化学过程有重要影响，也是调制局地海气相互作用的重要热、动力因子。南海西部不仅是中尺度涡的频发区，而且涡旋影响范围广持续时间长，具有丰富的次海盆尺度以及中尺度的热、动力内涵。本项目以大量现场观测为基础，统计方法为手段，并充分利用高分辨率海气耦合模式，首先明确南海西部涡致热盐输运的基本规律，继而探讨涡致热异常对上层大气状况（主要包括风场云量和降雨等）的影响，最终揭示西部涡旋诱发的局地海气反馈过程与机理。将试验结果与统计结果相结合，得出南海西部涡旋对局地海气的统计贡献与概念模型，以期为南海区域海气相互作用研究提供更深一步的理论依据。

中尺度涡是物理海洋的重要组成部分，不仅对海洋热、动力过程以及生物地球化学过程有重要影响，也是调制局地海气相互作用的重要热、动力因子。南海西部不仅是中尺度涡的频发区，而且涡旋影响范围广持续时间长，具有丰富的次海盆尺度以及中尺度的热、动力内涵。本项目以大量现场观测为基础，统计方法为手段，并充分利用高分辨率海气耦合模式，首先明确南海西部涡致热盐输运的基本规律，继而探讨涡致热异常对上层大气状况（主要包括风场云量和降雨等）的影响，最终揭示西部涡旋诱发的局地海气反馈过程与机理。将试验结果与统计结果相结合，得出南海西部涡旋对局地海气的统计贡献与概念模型，以期为南海区域海气相互作用研究提供更深一步的理论依据。.按照研究计划，本项目以南海海气观测为根本，结合卫星数据，剖析南海尤其是西部涡旋的上层海洋热动力过程；探讨涡致热输运和热异常对海气和生态的重要影响。对南海西部中尺度涡的演变特征与机理；南海西部中尺度过程的引起的热力、动力、生态响应及反馈等主要问题进行了深入研究。研究过程中所构建的SCSPOD和SCSSLH数据产品向国内外同行公开，已有多个研究单位用于海洋热动力过程和海气相互作用等多方面研究，推动了我们自主知识产权数据在国内和国际的推广。