Accession Number : ADA331875

Title :   Circulation within Monterey Submarine Canyon

Descriptive Note : Final rept. 1 Mar 93-28 Feb 96

Corporate Author : MONTEREY BAY AQUARIUM RESEARCH INST MOSS LANDING CA

Personal Author(s) : Rosenfeld, Leslie

PDF Url : ADA331875

Report Date : NOV 1997

Pagination or Media Count : 7

Abstract : This project studied the circulation and transport of material in Monterey Submarine Canyon. Five subsurface moorings supporting twelve current meters with temperature sensors (six also measured conductivity and light transmission) and six sediment traps were deployed. Numerous CTD casts were made during four cruises. As expected, tidal frequencies dominated the energy spectra, and mean currents were very weak. Surprisingly, a three-day oscillation was found at all the measurement sites within the canyon. Two sediment traps deployed in the narrower region of the canyon recorded dramatically different flux regimes, with the 780 m trap collecting 2-4 g m(-2) d(-1), and the 1360 m trap collecting 22-60 g m(-2) d(-1). The predominantly lithogenic composition of the material in the deeper trap is evidence that canyon wall resuspension events dominate the flux regime there, whereas the lower concentrations of lithogenic material in the shallower trap, together with the seasonal pattern in the opal flux, indicate the influence of seasonal phytoplankton blooms. The mass fluxes measured in the wider part of the canyon were only 0.2-1.7 g m(-2)d(-1).

Descriptors :   *OCEAN CURRENTS, *SEDIMENT TRANSPORT, *SUBMARINE CANYONS, MASS FLOW, SEASONAL VARIATIONS, LIGHT TRANSMISSION, CONCENTRATION(COMPOSITION), SEDIMENTS, FLOWMETERS, PHYTOPLANKTON, OCEAN TIDES, PLANKTON BLOOMS.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE