Atlantic-Origin Overflow Water in the East Greenland Current
Atlantic-Origin Overflow Water in the East Greenland Current
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东格陵兰海流中的大西洋起源溢流水
DOI：
10.1175/jpo-d-18-0216.1
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发表时间：
2019
影响因子：
3.5
通讯作者：
Haine, Thomas W.
中科院分区：
文献类型：
--
作者：
Håvik, Lisbeth;Almansi, Mattia;Våge, Kjetil;Haine, Thomas W.
东格陵兰海流（EGC）沿着格陵兰东海岸向南输送的密集水团对丹麦海峡溢出的贡献最大。当离开丹麦海峡时，这些密集的水团下沉到深处，并为北大西洋的深层环流提供营养。根据丹麦海峡上游一年的系泊观测和弗拉姆海峡与丹麦海峡之间的历史水文剖面，我们发现EGC输送的大部分（75%）溢流水（≥ 27.8 kg m−3）来自大西洋（位温θ> 0°C）。南极水的温度沿流变化在69°N以北的Bracheville盆地的北方端是中等的，但从这一点向南，温度下降得更快。我们假设这种增强的改变与EGC在接近69°N处分叉成陆架断裂EGC和分离EGC有关。这与增强的涡动活动和强烈的水团修改减少中间温度和盐度最大值的南极起源的水。在大（小）修改程度的期间，分离电流强（弱）。高分辨率数值模式的输出支持我们的假设，并揭示了大涡动活动与格陵兰大陆架的特征表面淡水层的离岸转移。涡旋活动的强度决定了EGC系统输送的丹麦海峡溢流水的密度和水文特性。
Dense water masses transported southward along the east coast of Greenland in the East Greenland Current (EGC) form the largest contribution to the Denmark Strait Overflow. When exiting Denmark Strait these dense water masses sink to depth and feed the deep circulation in the North Atlantic. Based on one year of mooring observations upstream of Denmark Strait and historical hydrographic profiles between Fram Strait and Denmark Strait, we find that a large part (75%) of the overflow water (≥ 27.8 kg m−3) transported by the EGC is of Atlantic origin (potential temperatureθ> 0°C). The along-stream changes in temperature of the Atlantic-origin Water are moderate north of 69°N at the northern end of Blosseville basin, but southward from this point the temperature decreases more rapidly. We hypothesize that this enhanced modification is related to the bifurcation of the EGC taking place close to 69°N into the shelfbreak EGC and the separated EGC. This is associated with enhanced eddy activity and strong water mass modification reducing the intermediate temperature and salinity maxima of the Atlantic-origin Water. During periods with a large (small) degree of modification the separated current is strong (weak). Output from a high-resolution numerical model supports our hypothesis and reveals that large eddy activity is associated with an offshore shift of the surface freshwater layer that characterizes the Greenland shelf. The intensity of the eddy activity regulates the density and the hydrographic properties of the Denmark Strait Overflow Water transported by the EGC system.
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影响因子：
3.5
作者：
Wilken‐Jon Appen;U. Schauer;T. Hattermann;A. Beszczynska
通讯作者：
A. Beszczynska
影响因子：
3.5
作者：
Wilken‐Jon Appen;Dana Mastropole;R. Pickart;H. Valdimarsson;S. Jónsson;J. Girton
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影响因子：
8
作者：
Bromwich, D. H.;Wilson, A. B.;Walsh, J. E.
通讯作者：
Walsh, J. E.
DOI：
10.1016/j.dsr.2016.04.012
发表时间：
2016-08-01
影响因子：
2.4
作者：
Latarius, K.;Quadfasel, D.
通讯作者：
Quadfasel, D.
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
E. Buch;S. Malmberg;Stefán S. Kristmannsson
通讯作者：
Stefán S. Kristmannsson