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Decadal-scale variations of water mass properties in the deep Weddell Sea

机译：韦德海深处水体质量的年代尺度变化

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摘要

Data from cruises between 1989 and 2003 with FS Polarstern were used to construct section-wide potential temperature and salinity time series of the main water masses in the Weddell Gyre. In tandem with these CTD data, two time series between 1989 and 1995 are presented from moored instruments in the central Weddell Sea. The regional and methodological consistency of the dataset allows us to quantify variations which are not visible in less homogeneous datasets. The data reveal significant temperature and salinity variations of the Warm Deep Water and the Weddell Sea Bottom Water on a decadal time scale. The longest time series were obtained at the prime meridian. Here warming is observed in the Warm Deep Water from 1992 to 1998 followed by cooling. In the Weddell Sea proper, measurements of instruments moored in the Weddell Sea Bottom Water layer recorded a temperature increase over 6 years at a rate of 0.01 °C a~(–1). After the mooring period, CTD casts in 1998 point to a weakening of the trend. The warming trend in the bottom water occurs over most of the Weddell Sea, as detected in the additional CTD surveys. The variations are close to the detection level in the voluminous Weddell Sea Deep Water. The initial warming trend of the Warm Deep Water is consistent with warming trends reported in literature of subsurface waters of the Antarctic Circumpolar Current. The reversal of the trend in the Weddell Sea seems to be related to variations of the atmospheric conditions which can affect both the intrusion of Circumpolar Deep Water from the north and the circulation of the Weddell Gyre. Because the Warm Deep Water is the major source water for the formation of deep and bottom water in the Weddell Sea, it is suggested that its increase in temperature and salinity is likely to at least partly cause the variations which were observed in the bottom water.
机译：1989年至2003年之间使用FS Polarstern航行的数据被用于构造Weddell Gyre中主要水团的全剖面潜在温度和盐度时间序列。与这些CTD数据相结合，从韦德海中部的系泊仪器中得出了1989年至1995年之间的两个时间序列。数据集的区域和方法学一致性使我们能够量化在不太均一的数据集中不可见的变化。数据显示，深水和韦德尔海底水的温度和盐度在十年时间尺度上有显着变化。在本初子午线上获得了最长的时间序列。从1992年到1998年，在温暖的深水中观测到变暖，然后降温。在韦德尔海域，对停泊在韦德尔海底水层中的仪器进行的测量记录了6年间温度以0.01°C a〜（–1）的速度上升。系泊期结束后，1998年的CTD铸造表明趋势有所减弱。正如在其他CTD调查中所发现的那样，在整个韦德尔海中，底部水域的变暖趋势都发生了。这些变化接近大量的韦德尔海深水中的检测水平。温暖深水的初始变暖趋势与南极绕极流地下水的文献报道的变暖趋势一致。韦德海趋势的逆转似乎与大气条件的变化有关，这可能会影响到北极极地深水从北部的入侵以及韦德环流的循环。由于温暖的深水是韦德尔海深水和底水形成的主要来源水，因此建议其温度和盐度的升高可能至少部分导致底水中观测到的变化。

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  • 来源
    《Ocean Dynamics》 |2004年第1期|p. 77-91|共15页
  • 作者

    Eberhard Fahrbach; Mario Hoppema; Gerd Rohardt; Michael Schroder; Andreas Wisotzki;

  • 作者单位

    Alfred Wegener Institute for Polar and Marine Research, Climate System Department, PO Box 120161, 27515 Bremerhaven, Germany;

    Alfred Wegener Institute for Polar and Marine Research, Climate System Department, PO Box 120161, 27515 Bremerhaven, Germany;

    Alfred Wegener Institute for Polar and Marine Research, Climate System Department, PO Box 120161, 27515 Bremerhaven, Germany;

    Alfred Wegener Institute for Polar and Marine Research, Climate System Department, PO Box 120161, 27515 Bremerhaven, Germany;

    Alfred Wegener Institute for Polar and Marine Research, Climate System Department, PO Box 120161, 27515 Bremerhaven, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    southern ocean; weddell Sea; water mass variability; time series; temperature; salinity;

    机译：南部海洋;韦德尔海;水质变异性;时间序列;温度;盐度;

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