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首页> 外文期刊>Journal of Physical Oceanography >Atlantic-Origin Overflow Water in the East Greenland Current
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Atlantic-Origin Overflow Water in the East Greenland Current

机译：东格陵兰洋流的大西洋-原始溢流水

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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 (sigma theta >= 27.8 kg m(-3)) transported by the EGC is of Atlantic origin (potential temperature theta > 0 degrees C). The along-stream changes in temperature of the Atlantic-origin Water are moderate north of 69 degrees 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 degrees 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.
机译：沿东格陵兰海流（EGC）沿格陵兰东海岸向南输送的密集水团是丹麦海峡溢流的最大原因。当离开丹麦海峡时，这些稠密的水团沉入深度并为北大西洋的深层循环提供了养料。根据丹麦海峡上游的一年的系泊观测以及弗拉姆海峡和丹麦海峡之间的历史水文剖面，我们发现有很大一部分（75％）的溢流水（sigma theta> = 27.8 kg m（-3））被输送EGC的数据来自大西洋（潜在温度theta> 0摄氏度）。大西洋沿岸水的温度沿顺流变化位于布洛斯维尔盆地北端的北纬69度以北，但从此点开始向南，温度下降得更快。我们假设，这种增强的修饰与EGC的分叉有关，该EGC的分叉发生在接近架子的EGC和分离的EGC的北纬69度附近。这与增强的涡流活动和强大的水质调节功能有关，从而降低了大西洋起源水的中间温度和最大盐度。在较大（较小）修改度的期间，分离电流很强（弱）。高分辨率数值模型的输出支持了我们的假设，并揭示出大涡流活动与格陵兰陆架特征性的表层淡水层的离岸变化有关。涡旋活动的强度调节了EGC系统输送的丹麦海峡溢流水的密度和水文特性。

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