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首页> 外文期刊>Journal of Physical Oceanography >Basin-Wavelength Equatorial Deep Jet Signals across Three Oceans*
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Basin-Wavelength Equatorial Deep Jet Signals across Three Oceans*

机译:跨越三大洋的盆地波长赤道深喷射信号*

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摘要

Equatorial deep jets (EDJs) are equatorially trapped, stacked, zonal currents that reverse direction every few hundred meters in depth throughout much of the water column. This study evaluates their structure observationally in all three oceans using new high-vertical-resolution Argo float conductivity-temperature-depth (CTD) instrument profiles from 2010 to 2014 augmented with historical shipboard CTD data from 1972 to 2014 and lower-vertical-resolution Argo float profiles from 2007 to 2014. The vertical strain of density is calculated from the profiles and analyzed in a stretched vertical coordinate system determined from the mean vertical density structure. The power spectra of vertical strain in each basin are analyzed using wavelet decomposition. In the Indian and Pacific Oceans, there are two distinct peaks in the power spectra, one Kelvin wave-like and the other entirely consistent with the dispersion relation of a linear, first meridional mode, equatorial Rossby wave. In the Atlantic Ocean, the first meridional mode Rossby wave signature is very strong and dominates. In all three ocean basins, Rossby wave-like signatures are coherent across the basin width and appear to have wavelengths the scale of the basin width, with periods of about 5 yr in the Indian and Atlantic Oceans and about 12 yr in the Pacific Ocean. Their observed meridional scales are about 1.5 times the linear theoretical values. Their phase propagation is downward with time, implying upward energy propagation if linear wave dynamics hold.
机译:赤道深水喷射流(EDJ)被赤道截留,堆积的纬向水流逆转,在整个水柱的大部分区域中,每数百米深的水流反向。这项研究使用从2010年至2014年的新型高垂直分辨率Argo浮子电导率-温度-深度(CTD)仪器剖面图并在1972年至2014年的舰载CTD历史数据以及较低垂直分辨率的Argo的基础上,对这三个海洋的观测进行了评估。从2007年到2014年的浮动剖面。从剖面计算密度的垂直应变,并在由平均垂直密度结构确定的拉伸垂直坐标系中进行分析。利用小波分解分析了每个盆地的垂直应变功率谱。在印度洋和太平洋,功率谱中有两个明显的峰,一个是开尔文波状,另一个完全符合线性,第一子午模赤道罗斯比波的色散关系。在大西洋中,第一个子午波模式Rossby波信号非常强并且占主导地位。在所有三个洋盆中,罗斯比波浪特征在整个洋盆宽度上是连贯的,并且似乎具有与洋盆宽度成比例的波长,在印度洋和大西洋的周期约为5年,在太平洋的周期约为12年。他们观测到的子午线尺度大约是线性理论值的1.5倍。它们的相位传播随时间向下传播,这意味着如果保持线性波动力学,则能量向上传播。

著录项

  • 来源
    《Journal of Physical Oceanography》 |2015年第8期|2134-2148|共15页
  • 作者单位

    NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA|CALTECH, Environm Sci & Engn, Pasadena, CA 91125 USA;

    NOAA, Pacific Marine Environm Lab, Seattle, WA 98115 USA;

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