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Deepening of the Atlantic Water Core in the Canada Basin in 2003-11

机译：2003-11年加拿大盆地大西洋水核心的加深

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摘要

In 2004, a cold mode of Atlantic Water (AW) entered the western Canada basin, replacing the anomalously warm AW that resided in the basin since the 1990s. This slightly colder AW was denser than the 1990s warm mode; it gradually filled most of the western basin by 2009. The enhanced surface stress curl led to the spinup of the Beaufort Gyre and convergence of freshwater. The spinup also resulted in a deepening of the AW core at the center of the gyre and in shoaling of the AW core at the margins of the gyre. The density versus depth relationship revealed in this study shows that the depth of the maximum AW temperature was mainly controlled by the density structure before 2007; thus, it is the case when the denser water was deeper and the case when the lighter water was shallower around the basin. However, this relationship was reversed to become the case when the denser water was shallower and the case when the lighter water was deeper since 2008 inside the Beaufort Gyre. The combined effect of density and sea ice retreat that enhanced surface stress curl determined the depth of the AW inside the Beaufort Gyre since 2008. The deepening of the AW core and expanding of the area where the AW deepening occurred had a profound effect on the large-scale circulation in the Arctic Ocean.
机译：2004年，冷水模式的大西洋水（AW）进入加拿大西部海盆，代替了1990年代以来一直存在于该盆地的异常温暖的AW。稍冷的AW比1990年代的暖模式密。到2009年，它逐渐填满了西部盆地的大部分地区。表面应力卷曲的增强导致了Beaufort Gyre的旋转和淡水的汇聚。旋转加速还导致了AW核心在回旋中心的加深，并导致AW核心在回旋的边缘被暗挖。这项研究揭示的密度与深度之间的关系表明，最高水汽温度的深度主要受2007年之前的密度结构控制。因此，在盆周围较浓的水较深，较轻的水较浅的情况。但是，自2008年以来，Beaufort Gyre内部的浓水变浅，淡水变深，这种关系被扭转。自2008年以来，密度和海冰退缩的共同作用增强了表面应力卷曲，从而确定了波弗特回旋区内的AW深度。AW核心的加深和AW加深发生的区域的扩大对大面积岩石产生了深远的影响。北冰洋的大规模环流。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第9期|2353-2369|共17页
  • 作者

    Zhong Wenli; Zhao Jinping;

  • 作者单位

    Ocean Univ China, Key Lab Phys Oceanog, Qingdao 266100, Peoples R China;

    Ocean Univ China, Key Lab Phys Oceanog, Qingdao 266100, Peoples R China;

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