Shelf basin exchange along the Siberian continental margin: Modification of Atlantic Water and Lower Halocline Water
Shelf basin exchange along the Siberian continental margin: Modification of Atlantic Water and Lower Halocline Water
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DOI：
10.1016/j.dsr.2016.06.008
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发表时间：
2016-09-01
影响因子：
2.4
通讯作者：
Timokhov, Leonid
中科院分区：
文献类型：
--
作者：
Bauch, Dorothea;Cherniayskaia, Ekaterina;Timokhov, Leonid
盐度和稳定氧同位素（δ O-18）的证据表明，海冰融水和大气沃茨沿着巴伦支海大陆边缘的混合物改变了北冰洋的大西洋水。平均而言，喀拉海以东的大西洋水核内没有进一步的大气沃茨影响，如恒定的O-18三角洲所示，而盐度沿着西伯利亚陆坡进一步降低。所有的LHW类型都显示了不同程度的河水和海冰形成的影响。LHW类型的地理分布表明，高盐度型LHW形成于巴伦支海和喀拉海，其它LHW类型形成于拉普捷夫海西北部或喀拉海东南部沃茨经Vilkitslcy海峡进入拉普捷夫海西北部。没有进一步修改的LHW被认为是在东部拉普捷夫海，但LHW类型的分布表明在这个位置的LHW的分叉，可能有一个分支继续沿大陆边缘和第二个分支沿着罗蒙诺索夫海脊。我们看到陆上和海上LHW类型之间没有明显的区别，作为LHW组件，发现在盐跃层内的盆地也显示出一个狭窄的底界分布在大陆坡，这是一致的大陆架边界电流，以及射流的水进入西部拉普捷夫海从喀拉海通过Vilkitsky海峡。(C)2016爱思唯尔有限公司版权所有
Salinity and stable oxygen isotope (delta O-18) evidence shows a modification of Atlantic Water in the Arctic Ocean by a mixture of sea-ice meltwater and meteoric waters along the Barents Sea continental margin. On average no further influence of meteoric waters is detectable within the core of the Atlantic Water east of the Kara Sea as indicated by constant delta O-18, while salinity further decreases along the Siberian continental slope.Lower Halocline Waters (LHW) may be divided into different types by Principal Component Analysis. All LHW types show the addition of river water and an influence of sea-ice formation to a varying extent. The geographical distribution of LHW types suggest that the high salinity type of LHW forms in the Barents and Kara seas, while other LHW types are formed either in the northwestern Laptev Sea or from southeastern Kara Sea waters that enter the northwestern Laptev Sea through Vilkitslcy Strait. No further modification of LHW is seen in the eastern Laptev Sea but the distribution of LHW-types suggest a bifurcation of LHW at this location, possibly with one branch continuing along the continental margin and a second branch along the Lomonosov Ridge. We see no pronounced distinction between onshore and offshore LHW types, as the LHW components that are found within the halocline over the basin also show a narrow bottom-bound distribution at the continental slope that is consistent with a shelf boundary current as well as a jet of water entering the western Laptev Sea from the Kara Sea through Vilkitsky Strait. (C) 2016 Elsevier Ltd. All rights reserved.