Turbulent Exchange in Unsteady Air–Sea Interaction at Small and Submesoscales

IF 0.9 4区 地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES
A. M. Chukharev, M. I. Pavlov
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引用次数: 0

Abstract

An adequate description of the interaction between the atmosphere and ocean remains one of the most important problems of modern oceanology and climatology. The extremely wide variety of physical processes occurring in the coupled layers, large range of scales, and moving boundary all significantly complicate the creation of models that would allow calculating the physical characteristics in both media with the necessary accuracy. In this paper the temporal variability of dynamic parameters in the driving layer of the atmosphere and in the near-surface layer of the sea on small and submesoscales from one to several tens of hours is considered. The experimental data show a very high correlation between the friction wind velocity and turbulence intensity in the upper sea layer on all scales recorded. One important distinguishing feature of all measured physical quantities in both media is the presence of quasi-periodic oscillations with different periods. For a more accurate description of momentum and energy fluxes from the atmosphere, a nonstationary model of turbulent exchange in the near-surface layer of the sea is proposed. It takes into account quasi-periodicity in the intensity of dynamic interaction between the atmosphere and the sea at these scales. In the model we use the equations of momentum and turbulent energy balance, the system of equations is solved numerically, and the calculation results are compared with other models and with experimental data. It is shown that taking into account the nonstationarity of the wind strain improves the correspondence between the calculations and the experimental data. It is noted that, in the nonstationary case, the energy and momentum flux from the atmosphere and the turbulence intensity increases compared to the action of a constant average wind of the same duration. Therefore, the strong averaging often used in global models may markedly underestimate the intensity of the dynamic interaction between the atmosphere and ocean.

Abstract Image

小尺度和亚主题尺度非稳定海气相互作用中的湍流交换
摘要 充分描述大气和海洋之间的相互作用仍然是现代海洋学和气候学最重要的问题之一。耦合层中发生的物理过程种类繁多,尺度范围大,边界移动,所有这些都使模型的建立变得非常复杂,而模型的建立可以以必要的精度计算两种介质中的物理特征。本文考虑了大气驱动层和近海面层的动态参数在小尺度和次中尺度(从一小时到几十小时)上的时变性。实验数据显示,在所记录的所有尺度上,海面上层的摩擦风速和湍流强度之间都有很高的相关性。在这两种介质中测量到的所有物理量的一个重要特征是存在不同周期的准周期振荡。为了更准确地描述来自大气层的动量和能量通量,提出了近海面层湍流交换的非稳态模型。该模型考虑了大气与海洋在这些尺度上动态相互作用强度的准周期性。在模型中,我们使用了动量和湍流能量平衡方程,对方程组进行了数值求解,并将计算结果与其他模型和实验数据进行了比较。结果表明,考虑到风应变的非平稳性,计算结果与实验数据之间的对应关系有所改善。值得注意的是,在非稳态情况下,与相同持续时间的恒定平均风的作用相比,来自大气的能量和动量通量以及湍流强度都会增加。因此,全球模式中经常使用的强平均法可能会明显低估大气与海洋之间动态相互作用的强度。
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来源期刊
CiteScore
1.40
自引率
28.60%
发文量
56
审稿时长
6-12 weeks
期刊介绍: Izvestiya, Atmospheric and Oceanic Physics is a journal that publishes original scientific research and review articles on vital issues in the physics of the Earth’s atmosphere and hydrosphere and climate theory. The journal presents results of recent studies of physical processes in the atmosphere and ocean that control climate, weather, and their changes. These studies have possible practical applications. The journal also gives room to the discussion of results obtained in theoretical and experimental studies in various fields of oceanic and atmospheric physics, such as the dynamics of gas and water media, interaction of the atmosphere with the ocean and land surfaces, turbulence theory, heat balance and radiation processes, remote sensing and optics of both media, natural and man-induced climate changes, and the state of the atmosphere and ocean. The journal publishes papers on research techniques used in both media, current scientific information on domestic and foreign events in the physics of the atmosphere and ocean.
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