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Mooring-Based Observations of Double-Diffusive Staircases over the Laptev Sea Slope

机译：拉普捷夫海坡上双扩散楼梯的系泊观测

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摘要

A yearlong time series from mooring-based high-resolution profiles of water temperature and salinity from the Laptev Sea slope (2003-04; 2686-m depth; 78°26'N, 125°37'E) shows six remarkably persistent staircase layers in the depth range of ～ 140-350 m encompassing the upper Atlantic Water (AW) and lower halocline. Despite frequent displacement of isopycnal surfaces by internal waves and eddies and two strong AW warming pulses that passed through the mooring location in February and late August 2004, the layers preserved their properties. Using laboratory-derived flux laws for diffusive convection, the authors estimate the time-averaged diapycnal heat fluxes across the four shallower layers overlying the AW core to be ～8 W m~(-2). Temporal variability of these fluxes is strong, with standard deviations of ～3-7 W m~(-2). These fluxes provide a means for effective transfer of AW heat upward over more than a 100-m depth range toward the upper halocline. These findings suggest that double diffusion is an important mechanism influencing the oceanic heat fluxes that help determine the state of Arctic sea ice.
机译：来自拉普捷夫海坡（2003-04; 2686-m深度; 78°26'N，125°37'E）的基于系泊的高分辨率水温和盐度剖面的长达一年的时间序列显示了六个非常持久的楼梯层在〜140-350 m的深度范围内，包括上大西洋水（AW）和下盐湖。尽管2004年2月至2004年8月晚间，通过内部波和涡旋频繁地使等渗面发生位移，并且两次强AW变暖脉冲通过系泊位置，但这些层仍保留了其特性。利用实验室导出的通量定律进行扩散对流，作者估计覆盖AW核心的四个较浅层的平均时间通量为〜8 W m〜（-2）。这些通量的时间变化性很强，标准偏差为〜3-7 W m〜（-2）。这些通量提供了一种有效的方式，可将AW热向上有效地向上传递超过100 m的深度范围。这些发现表明，双重扩散是影响海洋热通量的重要机制，有助于确定北极海冰的状态。

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  • 来源
    《Journal of Physical Oceanography》 |2012年第1期|p.95-109|共15页
  • 作者

    Igor V. Polyakov; Andrey V. Pnyushkov; Robert Rember; Vladimir V. Ivanov; Y.-D. Lenn; Laurie Padman; Eddy C. Carmack;

  • 作者单位

    University of Alaska Fairbanks, International Arctic Research Center, 930 Koyukuk Drive, Fairbanks, AK 99775;

    International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, Alaska;

    International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, Alaska;

    International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, Alaska;

    School of Ocean Sciences, Bangor University, Menai Bridge, United Kingdom;

    Earth & Space Research, Corvallis, Oregon;

    Fisheries and Oceans Canada, Institute of Ocean Sciences, Sidney, British Columbia, Canada;

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