Sayles, F. L.. Woods Hole Oceanographic Institution/Marine Chemistry & Geochemistry, fsayles@whoi.edu
Martin, W. L.. Woods Hole Oceanographic Institution/Marine Chemistry & Geochemistry, wmartin@whoi.edu
Honjo, S. Woods Hole Oceanographic Institution/Geology & Geophysics, shonjo@whoi.edu
Goudreau, J. E.. Woods Hole Oceanographic Institution/Marine Chemistry & Geochemistry, jgoudreau@whoi.edu

 
BENTHIC REMINERALIZATION OF CALCIUM CARBONATE, BIOGENIC OPAL AND ORGANIC CARBON ALONG THE USJGOFS SOUTHERN OCEAN STUDY TRANSECT
 
Pore water profiles, based on both in situ sampling techniques and recovered cores, were determined at mooring sites ranging from the Ross Sea to north of the APFZ and at intermediate sites between moorings 5 and 2. Fluxes of calcium carbonate, opal and organic matter across the sediment-water interface have been derived from these profiles. A particular focus of this study is the regeneration of calcium carbonate along a strong gradient in the ratio of organic carbon to calcium carbonate in the particulate rain (from approximately 10 (south) to 1(north)), driven by the large changes in the relative abundance of silica and carbonate secreting plankton along this transect. The data appear to require large scale remineralization of organic matter either in the deep (> 2000m) water column or at the sediment-water interface at silica dominated sites 5 and 4. Taken with year long measurements of particulate fluxes, remineralization rates are used to estimate regeneration efficiencies for carbonate, opal and organic carbon throughout the region.
 
Day: Friday, Feb. 5
Time: 04:15 - 04:30pm
Location: Sweeney Center
 
Code: SS31FR0415S