从海洋/大气边界层耦合模式看表层洋流和温度反馈对东北大西洋动能的影响

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Théo Brivoal , Guillaume Samson , Hervé Giordani , Romain Bourdallé-Badie , Florian Lemarié , Gurvan Madec
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引用次数: 0

摘要

将一维大气边界层(ABL1D)模式与 NEMO 海洋模式耦合,在伊比利亚-比斯开-爱尔兰(IBI)地区以 1/36° 的分辨率实施,以研究洋流和热反馈对中尺度动能(KE)的阻尼效应。海洋模式和 ABL1D 之间的这种耦合是一种新提出的方法,是介于大体强迫和与大气模式完全耦合之间的一种中间复杂性替代方法。在 ABL1D 中,预报示踪剂被推向大尺度变量,风则由 ERA-Interim 再分析提供的低频地转风引导。首先,在 2016-2017 年期间,ABL1D 成功地与风的卫星观测数据进行了验证,动态耦合系数(将近表面风和风压与表面流联系起来)与文献一致。我们的结果表明,热反馈对动能(KE)的影响可以忽略不计,也不会影响该区域的海流反馈强度。考虑到 ABL1D 物理原理,这进一步表明 CFB 引起的垂直风结构变化主要受与表面风应力条件相关的局地机械机制支配,而非行星边界层内的热力学或非局地过程。海流反馈引起的 KE 值下降在表层达到 14%,并向下传播到 2000 米,表明它可以改变整个水体的 KE 值垂直分布。表层边界层(0-300 米)和内部(300-2000 米)的 KE 值降低分别归因于表层风功降低了 4%和压力功降低了 7%。海流反馈引起的埃克曼泵异常往往会减弱涡旋活动和深度的水平压力梯度,说明海流反馈有可能引起水体的地营调节。这些结果表明了所提出的 ABL1D 耦合方法在再现风-流耦合(又称海流反馈效应)方面的相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of surface current and temperature feedback on kinetic energy over the North-East Atlantic from a coupled ocean / atmospheric boundary layer model

A one-dimensional Atmospheric Boundary Layer (ABL1D) model is coupled with the NEMO ocean model and implemented over the Iberian–Biscay–Ireland (IBI) area at 1/36° resolution to investigate the damping effect of the current and the thermal feedback on the kinetic energy (KE) at the mesoscale. This type of coupling between an ocean model and an ABL1D is a newly proposed approach as an alternative of intermediate complexity between bulk forcing and full coupling with an atmosphere model. In ABL1D, the prognostic tracers are nudged toward large-scale variables and the wind is guided by a low-frequency geostrophic wind provided from the ERA-Interim reanalyses. First, the ABL1D is successfully validated against satellite observations regarding the wind, and the dynamic coupling coefficient (linking the near surface wind and wind-stress to the of the surface currents) are consistent with the literature, over the period 2016–2017. Our results show that the thermal feedback has a negligible impact on kinetic energy (KE) and does not influence the strength of the current feedback in the region. Given the ABL1D physics, this further indicates that the changes in the vertical wind structure caused by CFB are primarily governed by local mechanical mechanisms associated with surface wind-stress condition, rather than by thermodynamic or non-local processes within the planetary boundary layer. The induced KE reduction by the current feedback amounts to 14% at the surface and propagates down to 2000 m, indicating that it can modify the vertical distribution of KE throughout the water column. KE reductions in the surface boundary layer (0 – 300 m) and in the interior (300 – 2000 m) are attributed to a reduction of the surface wind work by 4%, and of the pressure work by 7%, respectively. The Ekman pumping anomalies induced by the current feedback tend to attenuate eddy activity and horizontal pressure gradients at depth, illustrating the potential of the current feedback to induce a geostrophic adjustment on the water column. These results illustrate the relevance of the proposed ABL1D coupling approach for reproducing the wind-current coupling (a.k.a. current feedback effect) which cannot be taken into account straightforwardly with simple bulk forcing.

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来源期刊
Dynamics of Atmospheres and Oceans
Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理
CiteScore
3.10
自引率
5.90%
发文量
43
审稿时长
>12 weeks
期刊介绍: Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.
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