Long-term monitoring of hydrothermal heat flux using moored temperature sensors, Cleft segment, Juan de Fuca Ridge

Details Long-term monitoring of hydrothermal heat flux using moored temperature sensors, Cleft segment, Juan de Fuca Ridge Long-term monitoring of hydrothermal heat flux using moored temperature sensors, Cleft segment, Juan de Fuca Ridge

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1855b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 17, p. 1855-1858.

Other

9

Heat Flux, Heat Measurement, Mid-Ocean Ridges, Sea Floor Spreading, Volcanoes, Long Term Effects, Pacific Ocean, Temperature Sensors, Time Series Analysis

Scientific paper

Heat flux from submarine vent fields can vary gradually on interannual scales, or nearly instantaneously in response to volcano-tectonic events in the underlying crust. Neither case is well documented because measurements of vent-field scale heat flux are scarce. We report here a new approach to hydrothermal plume monitoring sensitive to both progressive changes and hydrothermal events. From June 1991 to May 1992 we moored 35 self-contained temperature sensors and six current meters on seven fhoorings located in and around the plume from a vent field on the Cleft segment, Juan de Fuca Ridge. The hydrothermal plume was identified by a local temperature anomaly of 0.01 to 0.03C in the lowermost 200 m of the water column. Plume heat flux, defined as the net advection of this temperature anomaly, averaged about 250 MW during the deployment. This flux is less than previous estimates and thus supports speculation that the heat flux is declining after a sudden reinvigoration triggered by a seafloor rifting event in 1986.

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