| 摘要: |
| 大气和海洋是影响地球气候系统的两个重要因素，它们之间的相互作用是海洋和大气研究的重要课题，海气耦合模式则是研究海气相互作用的重要工具，而海气耦合模式重点考虑的参数是海气通量。针对传统的大尺度海气耦合模式缺少湍流尺度分析的问题，本文使用并行大涡模拟海气耦合模式（The Parallelized Large-Eddy Simulation Model，PALM），在小尺度上探究风速对海气通量及湍流动能收支（Turbulence Kinetic Energy Budget，TKE Budget）的影响，设置了5、10和15m/s三种地转风速度对大气边界层（Atmospheric Boundary Layer，ABL）和海洋混合层（Oceanic Mixed Layer，OML）进行海气耦合模拟。研究表明：海气通量的分布与风速大小密切相关，风速越大，净热通量和浮力通量相对越大，由于温度上升导致海水蒸发加剧，使得大气的淡水通量增大；海洋湍流动能收支各项在近海面处受风速影响较大，且随着深度加深而逐渐减弱。本研究初步展示了小尺度海气耦合模式在海气通量研究中的应用，对进行小尺度海气相互作用研究具有一定的意义。 |
| 关键词: 大涡模拟 海气通量 海气耦合 湍流动能收支 |
| DOI：10.11693/hyhz20191200277 |
| 分类号:P731.26 |
| 基金项目:国家自然科学基金项目，41876003号；国家重点研发计划项目，2017YFA0604102号；国家自然科学基金项目，41830533号，41911530149号。 |
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| LARGE EDDY SIMULATION COUPLING MODEL FOR SMALL-SCALE AIR-SEA INTERACTION |
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SUN Dan-Yi, LI Shuang
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Ocean College, Zhejiang University, Zhoushan 316021, China
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| Abstract: |
| Atmosphere and ocean are two important factors that affect the Earth's climate system, and their interaction is an important topic for research. Aiming at the problem that the traditional large-scale air-sea coupled model lacks turbulence scale analysis, this study uses the Parallel Large Eddy Simulation Model (PALM) to explore the effects of wind speed on air-sea flux and turbulence kinetic energy budget on a small scale. Three types of geostrophic wind speeds(5, 10, and 15m/s) were set up to simulate the air-sea coupling of the atmospheric boundary layer (ABL) and ocean mixed layer (OML). Study shows that the distribution of air-sea flux is closely related to wind speed. The larger the wind speed, the larger the net heat flux and buoyancy flux. As the temperature rises, the evaporation of seawater intensifies and the freshwater flux of the atmosphere increases. Ocean turbulence kinetic energy budget is greatly affected by wind speed near the sea surface, and gradually weaken as the depth deepens. This study shows the application of the small-scale air-sea coupled model for the study of air-sea flux, which has certain significance for the study of small-scale air-sea interaction. |
| Key words: large eddy simulation air-sea flux air-sea coupling TKE budget |
