Water Mass Properties Derived From Satellite Observations in the Barents Sea
Water Mass Properties Derived From Satellite Observations in the Barents Sea
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DOI：
10.1029/2019jc015449
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
B. Barton;C. Lique;Y. Lenn
中科院分区：
文献类型：
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作者：
B. Barton;C. Lique;Y. Lenn
巴伦支海是一个深水形成的区域，在那里大西洋水被转化为更凉爽、更新鲜的巴伦支海水。巴伦特海水属性在季节、年际和年代际时间尺度上表现出变异性。这种可变性被转移到北极中间水，最终导致大西洋经向翻转环流的更深分支。巴伦支海海水性质的变化反映在空间高度(密度对海平面变化的贡献)中，空间高度取决于热量和淡水含量，通常是通过对巴伦支海冬季保持稀疏的水温、盐度和压力的现场观测得出的。这项分析探讨了卫星观测在显示巴伦支省海水特性和通过新方法查明变化趋势和来源方面的作用。我们给出了结合卫星观测的海平面高度(质量对海平面变化的贡献)、海表面高度和海表面温度的方法，并通过现场温度和盐度预测验证，以估计空间位高度。结果表明，海表面温度可以很好地反映巴伦支海东南部水柱上部的热含量，淡水含量可以从卫星资料中恢复。我们的分析表明，巴伦支省海水性质的大部分季节性来自海洋热量输送和大气热量flUX之间的平衡，而其年际变化是由热量和淡水平流驱动的。从海面到海底都有海洋，但成本很高，而且在某种程度上受到海冰和天气的限制。卫星观测海洋的频率更高，覆盖了海洋的更大部分，但无法测量海面以下的区域。我们将不同的卫星测量与新的物理和统计技术相结合，以推断水柱上部的海洋热量和淡水含量。使用我们基于卫星的上层海洋热量重建，我们确定季节性海洋热量输入被海洋对大气的变暖所平衡。这些结果增加了现有卫星测量的效用，并表明它们有潜力提供洞察力，从而改进对这一不断变化的北极地区的海冰和海洋性质的预测。
The Barents Sea is a region of deep water formation where Atlantic Water is converted into cooler, fresher Barents Sea Water. Barents Sea Water properties exhibit variability at seasonal, interannual, and decadal timescales. This variability is transferred to Arctic Intermediate Water, which eventually contributes to the deeper branch of the Atlantic meridional overturning circulation. Variations in Barents Sea Water properties are re fl ected in steric height (contribution of density to sea ‐ level variations) that depends on heat and freshwater contents and is a quantity usually derived from in situ observations of water temperature, salinity, and pressure that remain sparse during winter in the Barents Sea. This analysis explores the utility of satellite observations for representing Barents Sea Water properties and identifying trends and sources of variability through novel methods. We present our methods for combining satellite observations of eustatic height (the contribution of mass to sea ‐ level variations), sea surface height, and sea surface temperature, validated by in situ temperature and salinity pro fi les, to estimate steric height. We show that sea surface temperature is a good proxy for heat content in the upper part of the water column in the southeastern Barents Sea and that freshwater content can be reconstructed from satellite data. Our analysis indicates that most of the seasonality in Barents Sea Water properties arises from the balance between ocean heat transport and atmospheric heat fl ux, while its interannual variability is driven by heat and freshwater advection. ocean from surface to bottom but are costly and to some degree limited by sea ice and weather. Satellites observe the ocean more frequently, and cover larger parts of it, but cannot measure below the surface. We combine different satellite measurements with novel physical and statistical techniques to infer ocean heat and freshwater contents, integrated over the upper part of the water column. Using our satellite ‐ based reconstruction of upper ocean heat, we determine that the seasonal ocean heat import is balanced by the warming of the atmosphere by the ocean. These results increase the utility of the available satellite measurements and demonstrate their potential for providing insight that can improve predictions about sea ice and ocean properties in this changing Arctic region.