On the Nature and Variability of the East Greenland Spill Jet: A Case Study in Summer 2003*
On the Nature and Variability of the East Greenland Spill Jet: A Case Study in Summer 2003*
复制标题
东格陵兰溢流急流的性质和变化：2003 年夏季的案例研究*
DOI：
10.1175/jpo-d-10-05004.1
复制
发表时间：
2011
影响因子：
3.5
通讯作者：
R. Pickart
中科院分区：
文献类型：
--
作者：
M. Magaldi;T. Haine;R. Pickart
摘要本文介绍了2003年夏季Irminger盆地高分辨率（~2 km）数值模拟的结果。重点是东格陵兰溢出射流，最近发现的组成部分，在盆地的流通。模拟结果与地面场、丹麦海峡溢流（DSO）以及盆地典型剖面的水文结构的观测结果进行了良好的比较。该模型揭示了O（0.1-10）天和O（1-100）km尺度上的环流的新方面。模型的溢出射流的结果从东格陵兰大陆架的密集沃茨的级联。溢出可能发生在海峡西南部的各个位置，它是目前在整个模拟，但在O（0.1-10）天的周期表现出很大的变化。在速度场中，有时无法将溢流射流与表面涡或DSO区分开来。急流的涡度结构证实了其不稳定性，峰值相对涡度和倾斜涡度项达到行星涡度项的两倍。
AbstractResults from a high-resolution (~2 km) numerical simulation of the Irminger Basin during summer 2003 are presented. The focus is on the East Greenland Spill Jet, a recently discovered component of the circulation in the basin. The simulation compares well with observations of surface fields, the Denmark Strait overflow (DSO), and the hydrographic structure of typical sections in the basin. The model reveals new aspects of the circulation on scales of O(0.1–10) days and O(1–100) km.The model Spill Jet results from the cascade of dense waters over the East Greenland shelf. Spilling can occur in various locations southwest of the strait, and it is present throughout the simulation but exhibits large variations on periods of O(0.1–10) days. The Spill Jet sometimes cannot be distinguished in the velocity field from surface eddies or from the DSO. The vorticity structure of the jet confirms its unstable nature with peak relative and tilting vorticity terms reaching twice the planetary vorticity term.The...