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Woods Hole Oceanographic Institution

Irene Garcia Berdeal

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Publications
»Diffuse hydrothermal venting into the turbulent bottom boundary layer on Endeavour Segment, Juan de Fuca Ridge. I. Variability and implications for particle flux near the seafloor
»Diffuse hydrothermal venting into the turbulent bottom boundary layer on Endeavour Segment, Juan de Fuca Ridge. II. The mean flux of heat from the upper crust
»Spatial patterns of zooplankton and nekton in a hydrothermally active axial valley on Juan de Fuca Ridge
»Vertical structure of time-dependent currents in a mid-ocean ridge axial valley
»Influence of wind stress and ambient flow on a high discharge river plume


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I. Garcia Berdeal, S. L. Hautala, M. J. Pruis, and H. P. Johnson, Diffuse hydrothermal venting into the turbulent bottom boundary layer on Endeavour Segment, Juan de Fuca Ridge. I. Variability and implications for particle flux near the seafloor, to be submitted to Deep-Sea Research I, 2006

Observations are presented that provide information on the variability of currents and the turbulent fluxes of heat and momentum through the near-bottom boundary layer near diffuse low-temperature hydrothermal vents on the Juan de Fuca Ridge in the northeast Pacific. Within the bottom one meter of the water column, the direction and magnitude of record-mean current and tidal ellipses shows a very high degree of spatial heterogeneity. Temporal variability occurs at a variety of expected periodicities, including tidal, inertial and 4-day variations. Vertical shear of the prevailing current and buoyancy both make significant contributions to the generation of turbulence. At most sites, modulation of the prevailing current by the semidiurnal tide creates a shifting balance between mechanical and buoyant production terms. Extreme bottom roughness of the young basalt seafloor, along with contributions from buoyancy, lead to very high values of friction velocity. The variability in currents and turbulent fields in the near-bottom boundary layer revealed by these measurements presents a highly dynamic environment for the larvae of hydrothermal organisms that reside there.

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