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Three decades of deep water mass investigation in the Weddell Sea (1984-2014): Temporal variability and changes

机译：韦德尔海深水大规模调查的三十年（1984年至2014年）：时间的变化和变化

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摘要

The role of Antarctic Bottom Water (AABW) in changing the ocean circulation and controlling climate variability is widely known. However, a comprehensive understanding of the relative contribution and variability of Antarctic regional deep water mass varieties that form AABW is still lacking. Using a high-quality dataset comprising three decades of observational shipboard surveys in the Weddell Sea (1984-2014), we updated the structure, composition and hydrographic properties variability of the Weddell Sea deep-layer, and quantified the contribution of the source waters composing Weddell Sea Bottom Water (WSBW) in its main formation zone. Shifts in WSBW hydrographic properties towards less dense varieties likely equate to less WSBW being produced over time. WSBW is primarily composed of 71 +/- 4% of modified-Warm Deep Water (mWDW) and 29 +/- 4% of Dense Shelf Waters, with the latter composed by similar to two-thirds (19 +/- 2%) of High Salinity Shelf Water and similar to one-third (10 +/- 6%) of Ice Shelf Water. Further, we show evidence that WSBW variability in the eastern Weddell Sea is driven by changes in the inflow of Dense Shelf Waters and bottom water from the Indian Sector of the Southern Ocean. This was observed through the rise of the WSBW contribution to the total mixture after 2005, following a twenty-year period (1984-2004) of decreasing contribution.
机译：南极底水（AABW）在改变海洋环流和控制气候变化方面的作用是众所周知的。但是，仍然缺乏对形成AABW的南极区域深水团变种的相对贡献和变异性的全面了解。我们使用高质量的数据集，对Weddell海（1984-2014年）进行了三十年的观察性船上调查，从而更新了Weddell海深层的结构，组成和水文特性变异性，并量化了构成源水的贡献韦德尔海底水（WSBW）在其主要形成区。 WSBW的水文特性向密度较小的品种的转变可能等同于随着时间的推移产生的WSBW减少。 WSBW主要由71 +/- 4％的改良温暖深水（mWDW）和29 +/- 4％的密集架子水组成，后者约占三分之二（19 +/- 2％）高盐度架子水和大约三分之一（10 +/- 6％）的冰架子水。此外，我们显示出证据表明，东韦德海的WSBW变异性是由密集的架子水和来自南洋印度洋的底部水流入的变化所驱动的。在二十年（1984-2004年）的捐款减少之后，WSBW在2005年之后对全部混合燃料的捐款增加了。

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  • 来源
    《Deep-Sea Research》 |2018年第3期|70-83|共14页
  • 作者

    Kerr Rodrigo; Dotto Tiago S.; Mata Mauricio M.; Hellmer Hartmut H.;

  • 作者单位

    Fundacao Univ Fed Rio Grande, Inst Oceanog, Lab Estudos Oceanos & Clima, BR-96203900 Rio Grande, RS, Brazil;

    Fundacao Univ Fed Rio Grande, Inst Oceanog, Lab Estudos Oceanos & Clima, BR-96203900 Rio Grande, RS, Brazil;

    Fundacao Univ Fed Rio Grande, Inst Oceanog, Lab Estudos Oceanos & Clima, BR-96203900 Rio Grande, RS, Brazil;

    Helmholtz Gemeinschaft, Stiftung Alfred Wegener Inst Polar & Meeresforsch, Bussestr 24, D-27570 Bremerhaven, Germany;

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  • 正文语种 eng
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  • 关键词

    Deep ocean; Antarctic Bottom Water; Dense Shelf Water; Southern Ocean;

    机译：深海;南极底水;密集架子水;南大洋;

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