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Subantarctic mode water: distribution and circulation

机译：亚南极模式水：分配和循环

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摘要

The subduction and export of subantarctic mode water (SAMW) as part of the overturning circulation play an important role in global heat, freshwater, carbon and nutrient budgets. Here, the spatial distribution and export of SAMW is investigated using Argo profiles and a climatology. SAMW is identified by a dynamical tracer: a minimum in potential vorticity. We have found that SAMW consists of several modes with distinct properties in each oceanic basin. This conflicts with the previous view of SAMW as a continuous water mass that gradually cools and freshens to the east. The circulation paths of SAMW were determined using (modified) Montgomery streamlines on the density surfaces corresponding with potential vorticity minima. The distribution of the potential vorticity minima revealed "hotspots" where the different SAMW modes subduct north of the Subantarctic Front. The subducted SAMWs follow narrow export pathways into the subtropical gyres influenced by topography. The export of warmer, saltier modes in these "hotspots" contributes to the circumpolar evolution of mode water properties toward cooler, fresher and denser modes in the east.
机译：作为翻转循环的一部分，亚极模式水（SAMW）的俯冲和出口在全球热量，淡水，碳和养分预算中发挥着重要作用。在这里，使用Argo剖面和气候学研究了SAMW的空间分布和出口。 SAMW由动态示踪剂识别：潜在涡度最小。我们已经发现，SAMW由每个洋盆中具有不同性质的几种模式组成。这与以前的SAMW观点相矛盾，即SAMW是连续不断的水团，逐渐向东方冷却并清新。使用（修改的）蒙哥马利流线在对应于潜在涡度最小值的密度表面上确定SAMW的循环路径。潜在涡度极小值的分布揭示了“热点”，其中不同的SAMW模式在亚南极锋以北俯冲。俯冲的SAMW遵循狭窄的出口路径进入受地形影响的亚热带回旋。在这些“热点”中，较温暖，较咸的模式的出口有助于东部模式水性质向极凉，较新鲜和较稠密模式的极地演变。

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  • 来源
    《Ocean Dynamics》 |2011年第1期|p.103-126|共24页
  • 作者

    Laura Herraiz-Borreguero; Stephen Rich Rintoul;

  • 作者单位

    Quantitative Marine Science Program, Institute of Marine and Antarctic Studies, University of Tasmania,Hobart, Tasmania, Australia,Commonwealth Scientific and Industrial Research Organisation (CSIRO), Marine and Atmospheric Research,Hobart, Tasmania, Australia,Antarctic Climate and Ecosystems Cooperative Research Centre,Hobart, Tasmania, Australia;

    Centre for Australian Weather and Climate Research-apartnership of the Bureau of Meteorology and Commonwealth Scientific and Industrial Research Organisation (CSIRO),Hobart, Tasmania, Australia,Wealth from Oceans National Research Flagship,CSIRO Marine and Atmospheric Research,Hobart, Tasmania, Australia,Antarctic Climate and Ecosystems Cooperative Research Centre,Hobart, Tasmania, Australia;

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  • 正文语种 eng
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  • 关键词

    subantarctic mode water; potential vorticity; montgomery streamfunction; circulation; spatial distribution;

    机译：亚极模式水潜在涡度蒙哥马利流功能;循环;空间分布;

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