Biogeochemical evidence of vigorous mixing in the abyssal ocean

Details Biogeochemical evidence of vigorous mixing in the abyssal ocean Biogeochemical evidence of vigorous mixing in the abyssal ocean

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30i..12l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 9, pp. 12-1, CiteID 1459, DOI 10.1029/2002GL016638

Mathematics

Logic

Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes, Global Change: Oceans (4203), Oceanography: General: Benthic Boundary Layers, Oceanography: Biological And Chemical: Benthic Processes/Benthos, Global Change: Biogeochemical Processes (4805)

Scientific paper

The metabolic activities of biological communities living at the abyssal seabed create a strong source of nutrients and a sink for oxygen. If the published estimates of vertical mixing based on instantaneous microstructure measurements are correct, near to the abyssal seabed away from rough topographic features there should be enhanced concentrations of nitrate and phosphate and depletion of oxygen. Recent data on the vertical concentration profiles of inorganic nutrients and oxygen over the bottom 1000 m of the water column (World Ocean Circulation Experiment - WOCE) provide no such evidence. It is concluded that the effective vertical mixing rates are much more vigorous than previously indicated and may even be higher than estimates of average basin scale rates based on temperature and salinity distributions. We propose that the enhanced mixing associated with rough topography influences the entire volume of the abyssal ocean on short time scales (e.g., one month - one year).

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