Direct Temporal Cascade of Temperature Variance in Eddy-Permitting Simulations of Multidecadal Variability

Direct Temporal Cascade of Temperature Variance in Eddy-Permitting Simulations of Multidecadal Variability
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多年代变性的涡允许模拟中温度变化的直接时间级联

DOI:
10.5194/egusphere-egu2020-4992
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发表时间:
2020
期刊:
影响因子:
4.9
通讯作者:
B. Cornuelle
B. Cornuelle
中科院分区:
地球科学2区
文献类型:
--
作者:
A. Hochet;T. Huck;O. Arzel;F. Sévellec;A. Colin de Verdière;M. Mazloff;B. Cornuelle

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北大西洋的特点是,海平面温度在流域范围内有几十年的波动,周期从20年到70年不等。这种变化的一个候选者是与北大西洋洋流相关的大西洋温度梯度的大尺度斜压不稳定。由于涉及的时间尺度较长,大部分研究都是基于低分辨率的数值模式,忽略了显式中尺度涡的影响。与中尺度涡动场相关的高频运动如何影响流域尺度低频变率是本研究的中心问题。这个问题是解决使用一个理想化的配置的海洋环流模式在涡流允许的分辨率(20公里)。本文提出了一种新的诊断方法,它允许在频率空间中计算温度变化的非线性通量。使用此诊断,我们表明,中尺度涡的主要影响是阻尼低频温度变化,并将其转移到高频。
The North Atlantic is characterized by basin-scale multidecadal fluctuations of the sea surface temperature with periods ranging from 20 to 70 years. One candidate for such a variability is a large-scale baroclinic instability of the temperature gradients across the Atlantic associated with the North Atlantic Current. Because of the long time scales involved, most of the studies devoted to this problem are based on low-resolution numerical models leaving aside the effect of explicit mesoscale eddies. How high-frequency motions associated with the mesoscale eddy field affect the basin-scale low-frequency variability is the central question of this study. This issue is addressed using an idealized configuration of an ocean general circulation model at eddy-permitting resolution (20 km). A new diagnostic allowing the calculation of nonlinear fluxes of temperature variance in frequency space is presented. Using this diagnostic, we show that the primary effect of mesoscale eddies is to damp low-frequency temperature variance and to transfer it to high frequencies.
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发表时间: 2015
影响因子: 3.5
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发表时间: 2017
期刊: Journal of Climate
影响因子: 4.9
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期刊: CLIMATE DYNAMICS
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