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首页> 外文期刊>Journal of Physical Oceanography >An Edge-Referenced Surface Fresh Layer in the Beaufort Sea Seasonal Ice Zone
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An Edge-Referenced Surface Fresh Layer in the Beaufort Sea Seasonal Ice Zone

机译：博福特海季节性冰区中的边缘参照地表新鲜层

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摘要

To understand the factors causing the interannual variations in the summer retreat of the Beaufort Sea ice edge, Seasonal Ice Zone Reconnaissance Surveys (SIZRS) aboard U.S. Coast Guard Arctic Domain Awareness flights were made monthly from June to October in 2012, 2013, and 2014. The seasonal ice zone (SIZ) is where sea ice melts and reforms annually and encompasses the nominally narrower marginal ice zone (MIZ) where a mix of open-ocean and ice pack processes prevail. Thus, SIZRS provides a regional context for the smaller-scale MIZ processes. Observations with aircraft expendable conductivity-temperature-depth probes reveal a salinity pattern associated with large-scale gyre circulation and the seasonal formation of a shallow (similar to 20 m) fresh layer moving with the ice edge position. Repeat occupations of the SIZRS lines from 72 degrees to 76 degrees N on 140 degrees and 150 degrees W allow a comparison of observed hydrography to atmospheric indices. Using this relationship, the basinwide salinity signals are separated from the fresh layer associated with the ice edge. While this layer extends northward under the ice edge as the melt season progresses, low salinities and warm temperatures appear south of the edge. Within this fresh layer, average salinity is correlated with distance from the ice edge. The salinity observations suggest that the upper-ocean freshening over the summer is dominated by local sea ice melt and vertical mixing. A Price-Weller-Pinkel model analysis reveals that observed changes in heat content and density structure are also consistent with a 1D mixing process.
机译：为了了解造成Beaufort海冰边缘夏季退缩年际变化的因素，美国海岸警卫队北极域意识航班的季节性冰区侦察调查（SIZRS）于2012年，2013年和2014年的6月至10月每月进行一次。季节性冰区（SIZ）是海冰每年融化和改革的地方，涵盖了名义上较窄的边缘冰区（MIZ），在该地区主要混合了开放海洋和冰袋过程。因此，SIZRS为较小规模的MIZ过程提供了区域性环境。飞机消耗性电导率-温度-深度探测器的观测结果表明，盐度模式与大回旋环流以及随着冰缘位置移动的浅层（约20 m）淡层的季节性形成有关。 SIZRS线在140度和150度W处从N到72度到N到76度重复占领，从而可以将观测到的水文学与大气指数进行比较。利用这种关系，将流域范围内的盐度信号从与冰边缘相关的新鲜层中分离出来。当这一层随着融化季节的进行而向北延伸至冰缘之下时，低盐度和温暖的温度出现在冰缘的南部。在该新鲜层内，平均盐度与距冰边缘的距离相关。盐度观测表明，夏季上层海洋的新鲜度主要是局部海冰融化和垂直混合。 Price-Weller-Pinkel模型分析表明，观察到的热含量和密度结构变化也与一维混合过程一致。

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  • 来源
    《Journal of Physical Oceanography》 |2017年第5期|1125-1144|共20页
  • 作者

    Dewey Sarah R.; Morison James H.; Zhang Jinlun;

  • 作者单位

    Univ Washington, Appl Phys Lab, Polar Sci Ctr, Seattle, WA 98105 USA;

    Univ Washington, Appl Phys Lab, Polar Sci Ctr, Seattle, WA 98105 USA;

    Univ Washington, Appl Phys Lab, Polar Sci Ctr, Seattle, WA 98105 USA;

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