Journal
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
Volume 90, Issue -, Pages 89-101Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr2.2012.11.003
Keywords
Dissolved Fe; Dissolved Al; Dissolved Mn; South Shetland Islands; Antarctica; Austral-winter
Categories
Funding
- National Science Foundation through Office of Polar Programs [OPP 0443403, ANT-0948357]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [0948357] Funding Source: National Science Foundation
- Division Of Polar Programs
- Directorate For Geosciences [0948378] Funding Source: National Science Foundation
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Spatial distributions of dissolved iron (Fe), manganese (Mn) and aluminum (Al) in the upper 500 m of the water column near the Antarctic Peninsula (AP) during the 2006 austral-winter are consistent with diagenetically-produced sedimentary sources and are somewhat higher than data obtained in this region during the 2004 austral-summer. In contrast, surface phytoplankton abundances were 6-7 times lower relative to the 2004 austral-summer. Near the South Shetland Islands elevated levels of dissolved Al, Fe and Mn were found corresponding to high loads of resuspended material above the shelf as indicated by the transmissometer signal. Despite these high levels of trace metals, phytoplankton abundances in this area were lower than in the offshore Antarctic Circumpolar Current (ACC) waters. Offshore ACC stations had low concentrations of Fe, but up to five times greater abundance of phytoplankton. The difference in phytoplankton abundance between the regions seems largely driven by light availability, as indicated by mixed layer depths. The elevated trace metal concentrations near King George Island in the Bransfield Strait (BS) correspond to the flow path of the Bransfield Current. This enriched plume can also be seen exiting the BS, between Clarence and Elephant islands into the Ona Basin where it mixes with high nutrient low trace metal concentration ACC waters leading to high productivity in this region and further downstream in the Scotia Sea during the growing season. Published by Elsevier Ltd.
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