Antarctic Legacy Archive

Seasonal comparisons between dissolved trace metals (Copper, Zinc and Nickel. in the Southern Ocean. Insights into deep winter mixing

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dc.contributor.author Cloete, R.
dc.contributor.author Loock, J.C.
dc.contributor.author Mtshali, T.M.
dc.contributor.author Roychoudhury, A.N.
dc.coverage.spatial Southern Ocean
dc.coverage.spatial Bonus Goodhope Line
dc.date.accessioned 2021-03-05T15:52:48Z
dc.date.available 2021-03-05T15:52:48Z
dc.date.created 18-Aug
dc.date.issued 18-Aug
dc.identifier.uri http://hdl.handle.net/123456789/28421
dc.description.abstract The re-occupation of 3 stations (46°S, 50°S, 54°S. along the Bonus Goodhope Line, Southern Ocean, during a consecutive summer-winter cycle allowed us to investigate the biogeochemical cycling of three bio-active elements, copper (Cu., zinc (Zn. and nickel (Ni., in summer, when conditions favoured algal growth (e.g. high light levels and a stable, shallow mixed layer., and in winter, when conditions limit algal growth (e.g. low light levels and a deep mixed layer.. Results have implications in constraining the importance of winter deep mixing (entrainment. in supplying essential trace metals to depleted surface waters which then sustains phytoplankton productivity over the subsequent spring and summer seasons. Profiles of dissolved copper (dCu., zinc (dZn. and nickel (dNi. showed a general nutrient type behaviour throughout the study. In summer, dZn observed the greatest concentration range with sub-nanomolar surface concentrations increasing to 8 nmol kg-1 in bottom waters. dCu was typically 1 nmol kg-1 in surface waters and increased to 3 nmol kg-1 at depth. dNi showed a comparatively conservative profile throughout the water column with measured values between 5 and 7 nmol kg-1. Trace metal seasonality was most apparent in the mixed layer where average winter concentrations exceeded summer average concentrations by 0.2 nM for dCu, 0.9 nM for dZn and 0.5 nM for dNi. Summer-winter profiles in the intermediate and deep waters (>500m., were tightly correlated for each metal indicating a loss of seasonal signal in the deeper waters. Subsurface trace metal reservoirs were calculated by depth integrating the metal profiles between surface and mixed layer depth. Results show that the subsurface reservoir, that portion of the water column between the summer and winter mixed layers, contained between 59.18 – 139.64 nmol m-2 dCu, 56.77 – 344.21 nmol m-2 dZn and 243.74 – 675.70 nmol m-2 dNi, which represents an important source of micronutrients, at times larger than the summer mixed layer inventory, during the onset of the growth season. - Abstract as displayed in the - Abstract booklet. The presentation on the day may differ from the - Abstract. en_ZA
dc.description.sponsorship Sponsored by the the Department of Science and Innovation(DSI) through National Research Foundation (NRF) - South Africa en_ZA
dc.description.statementofresponsibility Antarctic Legacy of South Africa en_ZA
dc.format PDF en_ZA
dc.language English en_ZA
dc.language.iso en_ZA en_ZA
dc.publisher South African National Antarctic Programme (SANAP. en_ZA
dc.relation SANAP Symposium 2018 en_ZA
dc.rights Copyright en_ZA
dc.rights Copyright en_ZA
dc.subject Research en_ZA
dc.subject Science en_ZA
dc.subject Meetings en_ZA
dc.subject Symposium en_ZA
dc.subject SANAP Symposium 2018 en_ZA
dc.subject Earth Systems en_ZA
dc.subject Geotraces en_ZA
dc.subject Chemical Oceanography en_ZA
dc.subject Ocean Science en_ZA
dc.subject Trace Metals en_ZA
dc.subject Southern Ocean en_ZA
dc.subject Bonus Goodhope Line en_ZA
dc.subject Biogeochemical cycling en_ZA
dc.subject Algae en_ZA
dc.subject Phytoplankton en_ZA
dc.title Seasonal comparisons between dissolved trace metals (Copper, Zinc and Nickel. in the Southern Ocean. Insights into deep winter mixing en_ZA
dc.type Abstracts en_ZA
dc.rights.holder Antarctic Legacy of South Africa en_ZA
dc.rights.holder Cloete, R. en_ZA
dc.rights.holder Loock, J.C. en_ZA
dc.rights.holder Mtshali, T.M. en_ZA
dc.rights.holder Roychoudhury, A.N. en_ZA
iso19115.mdconstraints.uselimitation This item and the content of this website are subject to copyright protection. Reproduction of the content, or any part of it, other than for research, academic or non-commercial use is prohibited without prior consent from the copyright holder. en_ZA
iso19115.mddistributor.distributorcontact South African National Antarctic Programme -SANAP. en_ZA
iso19115.mdformat.name PDF en_ZA
iso19115.mdidentification.deliverypoint Antarctic Legacy of South Africa, Faculty of Science, Private Bag X1, Matieland. Stellenbosch. South Africa. en_ZA
iso19115.mdidentification.electronicmailaddress [email protected] en_ZA
iso19115.mdidentification.organizationname Stellenbosch University en_ZA
iso19115.mdidentification.organizationname Council for Scientific and Industrial Research en_ZA


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