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Baroclinic Transport Time Series of the Antarctic Circumpolar Current Measured in Drake Passage

机译：在德雷克海峡中测量的南极绕极电流的斜压输送时间序列

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摘要

The first multiyear continuous time series of Antarctic Circumpolar Current (ACC) baroclinic transport through Drake Passage measured by moored observations is presented. From 2007 to 2011,19 current- and pressure-recording inverted echo sounders and 3 current-meter moorings were deployed in Drake Passage to monitor the transport during the cDrake experiment. Full-depth ACC baroclinic transport relative to the bottom has a mean strength of 127.7 ± 1.0 Sverdrups (Sv; 1Sv(=) 10~6m~3s~(-1)) with a standard deviation of 8.1 Sv. Mean annual baroclinic transport is remarkably steady. About 65% of the baroclinic transport variance is associated with time periods shorter than 60 days with peaks at 20 and 55 days. Nearly 28 % of apparent energy in the spectrum computed from transport subsampled at the 10-day repeat cycle of the Jason altimeter results from aliasing of high-frequency signals. Approximately 80% of the total baroclinic transport is carried by the Subantarctic Front and the Polar Front. Partitioning the baroclinic transport among neutral density y" layers gives 39.2 Sv for Subantarctic Surface Water and Antarctic Intermediate Water (γ~n ＜ 27.5 kg m~(-3)), 57.5 Sv for Upper Circumpolar Deep Water (27.5 ＜ γ~n ＜ 28.0 kg m~(-3)), 27.7 Sv for Lower Circumpolar Deep Water (28.0 ＜ γ~n ＜ 28.2 kgm~(-3)), and 3.3 Sv for Antarctic Bottom Water (γ~n ＞ 28.2 kgm~(-3)). The transport standard deviation in these layers decreases with depth (4.0, 3.1,2.1, and 1.1 Sv, respectively). The transport associated with each of these water masses is statistically steady. The ACC baroclinic transport exhibits considerable variability and is a major contributor to total ACC transport variability.
机译：提出了由系泊观测测量的第一个多年连续时间序列南极绕极流（ACC）通过德雷克通道的斜压输送。从2007年到2011年，在Drake Passage中部署了19个记录电流和压力的反向回声测深仪和3个电流计系泊设备，以监测cDrake实验期间的运输情况。相对于底部的全深度ACC斜压输运具有127.7±1.0 Sverdrups（Sv; 1Sv（=）10〜6m〜3s〜（-1））的平均强度，标准偏差为8.1 Sv。平均年斜压输送量非常稳定。斜压输运变化的大约65％与短于60天的时间段有关，在20天和55天达到峰值。在Jason高度计的10天重复周期中对传输进行二次采样所计算出的频谱中，表观能量中有将近28％来自高频信号的混叠。亚压极锋和极地锋携带着大约80％的斜压运移。在中性密度y“层之间分配斜压输运，得出南极地表水和南极中层水（γ〜n ＜27.5 kg m〜（-3））为39.2 Sv，上极周极深水（27.5 ＜γ〜n ＜57.5 Sv） 28.0 kg m〜（-3）），下圆极深水为27.7 Sv（28.0 ＜γ〜n ＜28.2 kgm〜（-3）），南极底水为3.3 Sv（γ〜n＞ 28.2 kgm〜（- 3））。这些层的运移标准差随深度（分别为4.0、3.1、2.1和1.1 Sv）降低而减小，与这些水团中的每一个相关的运移在统计上都是稳定的，ACC斜压运移表现出相当大的可变性， ACC运输总变异性的主要贡献者。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第7期|1829-1853|共25页
  • 作者

    Maria Paz Chidichimo; Kathleen A. Donohue; D. Randolph Watts; Karen L. Tracey;

  • 作者单位

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island,CONICET/Departamento de Oceanografia, Servicio de Hidrografia Naval, Av.Montes de Oca 2124, C1270ABV, Buenos Aires, Argentina;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island;

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