Do submesoscale frontal processes ventilate the oxygen minimum zone off Peru?

Do submesoscale frontal processes ventilate the oxygen minimum zone off Peru?
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亚中尺度锋面过程是否为秘鲁附近的最低含氧区提供通风?

DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
A. Engel
A. Engel
中科院分区:
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文献类型:
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作者:
S. Thomsen;T. Kanzow;F. Colas;V. Echevin;G. Krahmann;A. Engel

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秘鲁的上升流系统包括海洋中最强烈和最浅的氧气最小区(OMZ)。这个系统显示出明显的次中尺度活动,如细丝和锋。我们在2013年南半球夏季期间在秘鲁进行了基于滑翔机的观测,以调查次中尺度锋面过程是否影响秘鲁OMZ。我们目前的观测证据俯冲高度含氧的地表水在一个亚中尺度冷丝。俯冲事件使氧跃层通风,但没有到达OMZ核心沃茨。在一个区域性的次中尺度允许模式中,我们研究了新涌上来的水的路径。大约50%的上涌虚拟浮子在5天内俯冲到混合层以下,强调了俯冲对秘鲁氧跃层通风的迄今未被认识的重要性。
The Peruvian upwelling system encompasses the most intense and shallowest oxygen minimum zone (OMZ) in the ocean. This system shows pronounced submesoscale activity like filaments and fronts. We carried out glider‐based observations off Peru during austral summer 2013 to investigate whether submesoscale frontal processes ventilate the Peruvian OMZ. We present observational evidence for the subduction of highly oxygenated surface water in a submesoscale cold filament. The subduction event ventilates the oxycline but does not reach OMZ core waters. In a regional submesoscale‐permitting model we study the pathways of newly upwelled water. About 50% of upwelled virtual floats are subducted below the mixed layer within 5 days emphasizing a hitherto unrecognized importance of subduction for the ventilation of the Peruvian oxycline.