The East Greenland Spill Jet
The East Greenland Spill Jet
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DOI：
10.1175/jpo2734.1
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发表时间：
2005-06-01
影响因子：
3.5
通讯作者：
Fratantoni, PS
中科院分区：
文献类型：
--
作者：
Pickart, RS;Torres, DJ;Fratantoni, PS
高分辨率的水文测量和速度测量显示，丹麦海峡以南的东格陵兰大陆架断裂处有一股强烈而狭窄的洋流，逆流而上。这被认为是由于密集的水从陆架边缘倾泻而下，并夹带了周围的水。这一洋流被命名为东格陵兰溢油急流。它位于东格陵兰/伊明格海流之下，向赤道方向输送大约2万加仑的水。在溢出过程中发生了强烈的垂直混合，尽管下游的夹带最小。涡度分析表明，急流内气旋相对涡度的增加被倾斜涡度部分平衡，导致势涡度的尖锐锋，使人联想到墨西哥湾流。描述了伊尔明格海边界流系统的其他组成部分，包括绝对输运的介绍。
High-resolution hydrographic and velocity measurements across the East Greenland shelf break south of Denmark Strait have revealed an intense, narrow current banked against the upper continental slope. This is believed to be the result of dense water cascading over the shelf edge and entraining ambient water. The current has been named the East Greenland Spill Jet. It resides beneath the East Greenland/Irminger Current and transports roughly 2 Sverdrups of water equatorward. Strong vertical mixing occurs during the spilling, although the entrainment farther downstream is minimal. A vorticity analysis reveals that the increase in cyclonic relative vorticity within the jet is partly balanced by tilting vorticity, resulting in a sharp front in potential vorticity reminiscent of the Gulf Stream. The other components of the Irminger Sea boundary current system are described, including a presentation of absolute transports.