Tidal Dynamics in the Axial Valley of the Mid-Atlantic Ridge

Details Tidal Dynamics in the Axial Valley of the Mid-Atlantic Ridge Tidal Dynamics in the Axial Valley of the Mid-Atlantic Ridge

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.b31b1101r&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #B31B-1101

Other

0450 Hydrothermal Systems (1034, 3017, 3616, 4832, 8135, 8424), 3021 Marine Hydrogeology, 3035 Midocean Ridge Processes, 3255 Spectral Analysis (3205, 3280)

Scientific paper

Ocean tides exert an important influence on mid-ocean ridge hydrothermal systems by modulating fluid flow both within the shallow crust and in the water column. Time series observations of exit-fluid properties (e.g., temperature, composition) from mid-ocean ridge hydrothermal systems commonly contain oscillations at tidal periods, and tidal currents influence the water column dispersal of hydrothermal plumes above ocean ridges. We use data from a ~6 month deployment of a SeaBird SBE 26 deep-sea tide gauge to constrain tidal dynamics within the axial valley of the Mid-Atlantic Ridge near the TAG hydrothermal field at 26°N. Both the pressure and temperature data from the tide gauge, which was deployed in a pillow basalt field at ~3600 m depth about 400 m away from the active TAG hydrothermal mound, show strong tidal oscillations at 1 cycle- per-day (cpd) and 2 cpd periods, along with a variety of other astronomical forcing periods, including a strong spectral peak at 53 minute period that appears to represent a barotropic current resonance within the axial valley. While resonant periods are common in enclosed, shallow water environments, this is the first time such a resonance has been observed in deep water. These results demonstrate that tidal dynamics within the axial valley of the MAR are more complex than previously supposed, and that high-frequency resonances can develop within the axial valley "channel" of slow-spreading oceanic ridges.

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