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Spatial and temporal distribution of Fe, Ni, Cu and Pb along 140E in the Southern Ocean during austral summer 2001/02

Citation

Lai, X and Norisuye, K and Mikata, M and Minami, T and Bowie, AR and Sohrin, Y, Spatial and temporal distribution of Fe, Ni, Cu and Pb along 140 E in the Southern Ocean during austral summer 2001/02, Marine Chemistry, 111, (40271) pp. 171-183. ISSN 0304-4203 (2008) [Refereed Article]


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DOI: doi:10.1016/j.marchem.2008.05.001

Abstract

The distribution of dissolved (D) and acid-dissolvable (AD) Fe, Ni, Cu and Pb in the upper water column (0300mdepth)was determined in the Australian sector of the Southern Ocean (140E meridian) during three cruises conducted between November 2001 and March 2002. For Ni and Cu, therewas no significant difference in concentration between dissolved and acid-dissolvable species. DNi and DCu showed significant (P = 0.01) positive correlations with silicate, phosphate and nitrate, reflecting their strong nutrient-type behaviour. For Fe and Pb, the acid-dissolvable concentration mostly exceeded the dissolved concentration, reflecting the importance of labile particulate species for these elements. DPb decreased between January and February in the Polar Frontal Zone and in Antarctic continental shelf water. ADPb maxima occurred in the Antarctic Zone, resulting in a maximum AD/D ratio of 7. The mean DFe concentration in the surface mixed layer was 0.3 nM in the sub-Antarctic zone, 0.4 nM in the Polar Frontal Zone, 0.5 nM in the Antarctic Zone and increased southward beyond the Antarctic Divergence and towards the continent. DFe did not show a clear temporal change in its horizontal distribution, which was in contrast to the other nutrients and trace metals. ADFe substantially increased in Antarctic continental shelf water where the AD/D ratio reached 11. The following conclusions can be drawn from these data. (1) Ni and Cu exist exclusively as dissolved species and their distributions are mainly controlled by their biogeochemical cycling, similar to those of the major nutrients. (2) Pb is dominated by particulate species. The distribution of DPb is temporally and spatially variable due to a sporadic source and strong scavenging. (3) DFe is rather a minor fraction of total Fe in Antarctic continental shelf water where shelf sediments and Antarctic sea-ice appear to be strong sources for Fe. There is substantial temporal variation in the supply of Fe to the upper water column. DFe in the mixed layer of the open Southern Ocean is maintained at low concentrations throughout summer due to uptake by phytoplankton and scavenging.

Item Details

Item Type:Refereed Article
Keywords:Southern Ocean Australian sector Trace metals Micronutrients Biogeochemical cycling
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Marine Oceanic Processes (excl. climate related)
Author:Bowie, AR (Associate Professor Andrew Bowie)
ID Code:57169
Year Published:2008
Web of Science® Times Cited:18
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2009-06-22
Last Modified:2009-07-21
Downloads:0

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