TAO data support the existence of large high frequency variations in cross-equatorial overturning circulation

TAO data support the existence of large high frequency variations in cross-equatorial overturning circulation
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TAO数据支持跨赤道翻转环流存在较大的高频变化

DOI:
10.1002/essoar.10508604.1
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Baker L
Baker L
中科院分区:
--
文献类型:
--
作者:
Baker L

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在NEMO海洋环流模式中,赤道翻转环流(MOC)在赤道附近的各大海盆中都存在大振幅振荡。这些振荡在太平洋的周期为3-15天,振幅为100 ±100 Sv,已被证明对应于赤道10°N/S范围内的风强迫的纬向积分赤道捕获波。从热带大气海洋(TAO)系泊阵列在赤道太平洋的动态高度观测也表现出光谱峰值与赤道陷波的色散关系。在这里,我们重新审视TAO观测,以确认振荡的振幅与模拟一致,支持模拟的大振幅MOC振荡。我们还表明,在观测和模拟的频谱的纬向结构预测的斜压波速度的变化,在整个海洋盆地的分层变化。
Large amplitude oscillations in the meridional overturning circulation (MOC) have been found near the equator in all major ocean basins in the NEMO ocean general circulation model. With periods of 3–15 days and amplitudes of ∼±100 Sv in the Pacific, these oscillations have been shown to correspond to zonally integrated equatorially trapped waves forced by winds within 10°N/S of the equator. Observations of dynamic height from the Tropical Atmosphere Ocean (TAO) mooring array in the equatorial Pacific also exhibit spectral peaks consistent with the dispersion relation for equatorially trapped waves. Here, we revisit the TAO observations to confirm that the amplitude of the oscillations is consistent with the simulations, supporting the modeled large amplitude MOC oscillations. We also show that the zonal structure of the frequency spectrum in both observations and simulations is predicted by changes in the baroclinic wave speed with variation in stratification across the ocean basin.
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