Hydrography and flow in the Lucky Strike segment of the Mid-Atlantic Ridge

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ID: 301121
2008
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Abstract
The Lucky Strike segment between 37 and 38N on the Mid-Atlantic Ridge is the focus of the international MoMAR program to monitor seafloor-spreading processes.During the GRAVILUCK cruise in August 2006, hydrographic, velocity and light-scattering data were collected in the rift valley at Lucky Strike in order to investigate the regional dynamics and to provide background information for the monitoring effort.The survey observations reveal a remarkably simple dynamical setting dominated by persistent northward flow transporting ≈0.2 Sv of water along the rift valley.Approximately half of this transport must upwell within a deep basin that occupies the northern half of the segment.In the comparatively shallow segment center, the along-valley transport takes place in two parallel, hydraulically controlled overflows on both sides of an active volcano that rises from the rift-valley floor.Within the better sampled of these overflows instantaneous velocities recorded during the survey were northward more than 95% of the time and occasionally exceeded 20 cm s -1
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Authors Andreas M. Thurnherr, Gilles Reverdin, Pascale Bouruet‐Aubertot, Louis C. St. Laurent, Annick Vangriesheim, Valérie Ballu
Journal journal of marine research
Year 2008
DOI
10.1357/002224008786176034
URL
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