Sulfate reduction in surface sediments of the southeast Atlantic continental margin between 15 degrees 38'S and 27 degrees 57' S (Angola and Namibia)

Article Abstract:

Sulfate reduction rates have been studied in surface sediments from 17 stations of the southeast Atlantic continental margin, 15 degrees 38'S-27 degrees 57' S, the area outlying from Angola and Namibia. Depth-integrated sulfate reduction rates were highest at 1300 m. They went down exponentially with greater water depth. Depth-integrated sulfate reduction rates agreed with known patterns of coastal upwelling intensity and correlated well with surface organic carbon concentrations. Lateral downslope transport of organic carbon apparently takes place, based on sulfate reduction rates as a function of depth and compared with sediment trap data. Kinetics of oxygen utilization in surface sediments are much faster than those for anaerobic organic carbon remineralization. The cause is not clear.

Germany, Angola, Namibia, Atlantic Ocean, Oceanographic research, Marine ecology, Continental margins

---

Sediment nutrient dynamics on the South Atlantic Bight continental shelf

Article Abstract:

Significant primary production by benthic microalgae occurs in the South Atlantic Bight (SAB) continental shelf sediments. The sediments act as a source of organic matter for the shelf system and may be a sink for regenerated nutrients. The nutrient dynamics of SAB shelf sediments have been investigated using a new coring method and laboratory experiments. Pore-water advection appears to be a significant transport process for promotion of nutrient exchange. In addition, the sediments have rapid reaction rates.

Marine sediments, Biogeochemistry, Continental shelf, Continental shelves

---

Similar abstracts:

• Abstracts: Crustal structure and magmatism of North Atlantic continental margins. Carboniferous magmatism in the Iapetus convergence zone: evidence from deep seismic reflection profiles
• Abstracts: Paleomagnetic study of the northern Ford Ranges, western Marie Byrd Land, West Antarctica: motion between West and East Antarctica
• Abstracts: Extensional collapse of the northern Taiwan mountain belt: comment and reply. Fracture-controlled magma conduits in an obliquely convergent continental magmatic arc: comment and reply
• Abstracts: Sex allocation and the evolutionary transition between solitary and gregarious parasitoid development. A generalized model of parasitoid, venereal, and vector-based transmission processes
• Abstracts: Organic matter mineralization rates in sediments: a within- and among-lake study. A direct comparison between the historical record of lake level and the delta18-O signal in carbonate sediments from Lake Turkana, Kenya

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.