期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 122, 期 4, 页码 3434-3450出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017JC012803
关键词
Denmark Strait overflow; transport calculation; ADCP
类别
资金
- European Union [308299]
- Co-Operative Project RACE II - Regional Atlantic Circulation and Global Change - German Federal Ministry for Education and Research (BMBF) [Forderkennzeichen 03F0729B]
- Icelandic Centre for Research
The major export route of dense water from the Nordic Seas into the North Atlantic is in the deep channel in Denmark Strait. Here currents have been monitored with one or two moored Acoustic Doppler Current Profilers (ADCPs) since 1996. Volume transport estimates of the Denmark Strait Overflow Water (DSOW) so far were based on these data, which were regressed to the total transport of dense water in a numerical model. The resulting transport has been used in many publications. Here we present results from an extended five-mooring array deployed in 2014/2015, which included measurements outside the swift overflow core. This array provided the basis for new calculations to estimate the DSOW transports. Furthermore, a correction is proposed for biases detected on some ADCPs, which led to earlier underestimation of the flow in the lower part of the plume. Using the new method, the mean DSOW transport is estimated to be 3.2 Sv in the period 1996-2016, without a significant trend. Uncertainties are typically 0.5 Sv. Beyond variations on the eddy scale, an empirical orthogonal functions (EOF) analysis of the velocity field reveals three dominant modes of variability: the first mode is roughly barotropic and corresponds to pulsations of the plume, the second mode represents the laterally shifting component of the plume's core position, and the third mode indicates the impact of the varying overflow thickness. Finally, DSOW transports are compared to the Faroe Bank Channel overflow transports, but no clear relationship is found.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据