Computer Science
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2831a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 11, pp.2831-2845
Computer Science
25
Scientific paper
We present microelectrode profiles of oxygen, pH, and porosity measured at in situ depth across the sediment-water interface from stations above and below the calcite saturation horizon in the equatorial Atlantic. Resistivity electrode data indicate that the diffusion coefficient for solutes is attenuated by nearly a factor of two within the top centimeter of the sediment lattice. Oxygen and porosity data are used to estimate that the organic carbon respiration rate of the sediment is 10-15 mol cm -2 yr -1 in these locations. Comparison of the pH data with numerical model results reveals that sedimentary calcite dissolves in response to respiration in the top few centimeters of sediment even above the saturation horizon. We calculate that the effective in situ dissolution rate constant for calcite required to explain these data is the neighborhood of 10-100% d -1 . Although more data are needed to confirm this result, it appears to be at least an order of magnitude less than the rate observed in laboratory stirred-reactor experiments.
Archer David
Emerson Steven
Reimers Clare
No associations
LandOfFree
Dissolution of calcite in deep-sea sediments: pH and O 2 microelectrode results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dissolution of calcite in deep-sea sediments: pH and O 2 microelectrode results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dissolution of calcite in deep-sea sediments: pH and O 2 microelectrode results will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1615393