Properties of the Atlantic derived halocline waters over the Laptev Sea continental margin: Evidence from 2002 to 2009
Properties of the Atlantic derived halocline waters over the Laptev Sea continental margin: Evidence from 2002 to 2009
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DOI：
10.1029/2011jc007269
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发表时间：
2011-10
影响因子：
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通讯作者：
I. Dmitrenko;V. Ivanov;S. Kirillov;E. Vinogradova;S. Torres-Valdés;D. Bauch
中科院分区：
文献类型：
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作者：
I. Dmitrenko;V. Ivanov;S. Kirillov;E. Vinogradova;S. Torres-Valdés;D. Bauch
2002-2009年在拉普捷夫海大陆边缘进行的一系列样带研究表明，下盐斜水（LHW）的横坡差异是一致的。在斜坡上，相对于斜坡外的LHW， LHW岩心平均温度和盐度分别升高0.39°C和0.26实际盐度单位。下伏的大西洋水（AW）温盐性表现出相反的模式；山坡上的天气更冷、更新鲜，山坡下的天气更温暖、更咸。尽管斜坡上和斜坡下的地表高压有不同的形成历史，但我们的研究结果表明，大陆斜坡区域上覆的地表高压获得了陆地上陆地高压损失的热量和盐的重要部分。这意味着在倾斜地形上增强的垂直混合的作用，这有助于斜坡上和斜坡外的LHW特性之间的差异。化学示踪剂（溶解氧和营养物）的分布提供了进一步的证据，支持这一解释，并进一步表明，LHW也可能受到来自外大陆架的水的影响。
[1] A series of transects carried out in 2002–2009 across the Laptev Sea continental margin show consistent cross‐slope differences of the lower halocline water (LHW). Over the slope the LHW core is on average warmer and saltier by 0.39°C and 0.26 practical salinity unit, respectively, relative to the off‐slope LHW. Underlying Atlantic water (AW) thermohaline properties exhibit an opposite pattern; it is colder and fresher over the slope and warmer and saltier off the slope. Although on‐slope and off‐slope LHWs have different formation histories, our results suggest that an important part of the heat and salt lost from the AW is gained by the overlying LHW over the continental slope area. This implies the role of enhanced vertical mixing over the sloping topography, which contributes to the difference between the on‐ and off‐slope LHW properties. The distribution of chemical tracers (dissolved oxygen and nutrients) provides further evidence supporting this interpretation and additionally suggests that the LHW may also be influenced by water from the outer shelf.