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Dynamics of transport and variability in the Denmark Strait overflow.

机译：丹麦海峡溢流的运输动力学和可变性。

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摘要

The overflow of dense water from the Nordic Seas through the Denmark Strait is one of the primary sources of the deep water in the world's oceans. In 1998, a rapid high-resolution survey on the F/S Poseidon with expendable profilers (XCP/XCTD) collected velocity, temperature and salinity data from the region of the Denmark Strait sill to study the initial descent of the overflow into the deep North Atlantic. The major results from this and an earlier, more modest, survey in 1997 on the R/V Aranda, along with additional analysis of satellite and current meter data, can be summarized as follows: (1) The flow near the sill is characterized by a strongly barotropic structure associated with a nearly-vertical temperature front. As the denser water descends the Greenland slope, it develops the bottom-intensified structure characteristic of a gravity current. (2) Initial transport of σ&thetas; > 27.8 water at the sill is measured by the synoptic sections to be 2.7 ± 0.6 Sv, essentially identical both in mean and variability to that measured in 1973 by a 5-week current meter array deployment. (3) Despite large spatial and temporal variability in velocity, thickness and transport, the overflow's pathway and descent with distance from the sill are remark ably steady. (4) Measurements of near-bottom shear stress (from logarithmic velocity fits) confirm the importance of bottom friction in controlling the rate of overflow descent. (5) Satellite sea-surface temperature images confirm the birth and downstream propagation of cyclonic eddies starting at approximately 125 km southwest of the sill. This same point is also marked by a change in the rate of overflow entrainment and a maximum in overflow speed. (6) The presence of subsurface eddies upstream of the appearance of the surface features suggests a geographical separation between the region of flow instability and the site of eddy generation and vortex stretching. These two distinct processes occur in the approach to the sill and over the steepest descent, respectively.
机译：从北欧海到丹麦海峡的浓水溢流是世界海洋深水的主要来源之一。 1998年，通过消耗性廓线仪（XCP / XCTD）对F / S 的波塞冬（Pitalid）进行了快速高分辨率的调查，收集了丹麦海峡槛区的速度，温度和盐度数据，以研究初始下降溢流到北大西洋深处。这次的结果以及1997年对R / V Aranda 进行的一次更适度的调查的主要结果，以及对卫星和电流表数据的附加分析可以总结如下：（1）窗台附近的水流的特征是与垂直温度前沿相关的强正压结构。随着稠密的水下降到格陵兰坡，它发展出重力流的底部增强结构特征。 （2）窗台的σ thetas;

著录项

  • 作者

    Girton, James Bannister.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Physical Oceanography.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 305 p.
  • 总页数 305
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;
  • 关键词

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