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The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

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Oxygen consumption in pelagic marine sediments.

J W Murray, V Grundmanis

Science (New York, N.Y.)

|September 26, 1980

Summary

Dissolved oxygen decreases with sediment depth in the Pacific, leveling off due to limited organic carbon supply from bioturbation. This creates measurable oxygen gradients and diffusive fluxes across the sediment-water interface.

Area of Science:

Marine geology
Geochemistry
Oceanography

Background:

Sediments in the central equatorial Pacific, specifically pelagic red clay and carbonate ooze, were studied.
Understanding oxygen dynamics in marine sediments is crucial for biogeochemical cycling.

Purpose of the Study:

To investigate the vertical distribution of dissolved oxygen in pelagic sediments.
To determine the factors controlling oxygen consumption at depth.
To quantify the diffusive oxygen flux across the sediment-water interface.

Main Methods:

In-situ measurements of dissolved oxygen in interstitial waters of marine sediments.
Analysis of sediment composition (red clay, carbonate ooze).
Assessment of organic carbon supply via bioturbation.

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Main Results:

Dissolved oxygen content decreases with increasing sediment depth.
Oxygen concentration stabilizes at non-zero values at deeper levels.
Reactive organic carbon supply, influenced by bioturbation, limits oxygen consumption.
Calculated average diffusive oxygen flux across the sediment-water interface is 8.8 x 10(-14) mol/cm²/s.

Conclusions:

Bioturbation plays a key role in regulating oxygen consumption in deep marine sediments.
The observed oxygen gradients drive measurable diffusive oxygen fluxes.
Sediment geochemistry and physical processes significantly impact benthic oxygen dynamics.