用随机建模方法捕捉湍流Ekman-Stokes边界层的特征

Q2 Earth and Planetary Sciences Advances in Science and Research Pub Date : 2023-07-05 DOI:10.5194/asr-20-55-2023
M. Klein, H. Schmidt
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引用次数: 0

摘要

摘要大气边界层(ABLs)在不同的时间尺度上表现出短时过程,从几天到秒不等,具有大尺度强迫和小尺度湍流响应的尺度分离。一个长期的挑战,在建模和模拟的ABLs是一个复杂的多尺度边界层动力学的物理表示。在本研究中,一个理想化的随时间变化的边界层,即所谓的Ekman-Stokes边界层(ESBL),被认为是中纬度和极地地区近地面流动的一个简单模型。ESBL由体面速度差的规定时间调制驱动。随机一维湍流(ODT)模型作为独立工具应用于ESBL,旨在沿代表性垂直坐标解决所有相关尺度的流动。与参考数据的对比表明,ODT能够捕捉随时间变化的边界层流动的相关特征。该模型预测,在边界层共振的情况下,当流动以局部科里奥利频率强迫时,体面耦合的参数增强。后者再现了临界纬度的阶效应。模型结果表明,在高强迫频率下,由于分离残余湍流的相对增加,整体流动与表面解耦。
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Capturing features of turbulent Ekman–Stokes boundary layers with a stochastic modeling approach
Abstract. Atmospheric boundary layers (ABLs) exhibit transient processes on various time scales that range from a few days down to seconds, with a scale separation of the large-scale forcing and the small-scale turbulent response. One of the standing challenges in modeling and simulation of ABLs is a physically based representation of complex multiscale boundary layer dynamics. In this study, an idealized time-dependent ABL, the so-called Ekman–Stokes boundary layer (ESBL), is considered as a simple model for the near-surface flow in the mid latitudes and polar regions. The ESBL is driven by a prescribed temporal modulation of the bulk–surface velocity difference. A stochastic one-dimensional turbulence (ODT) model is applied to the ESBL as standalone tool that aims to resolve all relevant scales of the flow along a representative vertical coordinate. It is demonstrated by comparison with reference data that ODT is able to capture relevant features of the time-dependent boundary layer flow. The model predicts a parametric enhancement of the bulk–surface coupling in the event of a boundary layer resonance when the flow is forced with the local Coriolis frequency. The latter reproduces leading order effects of the critical latitudes. The model results suggest that the bulk flow decouples from the surface for high forcing frequencies due to a relative increase in detached residual turbulence.
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来源期刊
Advances in Science and Research
Advances in Science and Research Earth and Planetary Sciences-Geophysics
CiteScore
4.10
自引率
0.00%
发文量
13
审稿时长
22 weeks
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