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. |
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dc.description.sponsorship |
Sponsored by the the Department of Science and Innovation(DSI) through National Research Foundation (NRF) - South Africa |
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dc.description.statementofresponsibility |
Antarctic Legacy of South Africa |
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dc.format |
PDF |
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dc.language |
English |
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dc.language.iso |
en_ZA |
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dc.publisher |
South African National Antarctic Programme (SANAP. |
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dc.relation |
SANAP Symposium 2018 |
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dc.rights |
Copyright |
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dc.rights |
Copyright |
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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 |
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dc.subject |
Earth Systems |
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dc.subject |
Geotraces |
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dc.subject |
Chemical Oceanography |
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dc.subject |
Ocean Science |
en_ZA |
dc.subject |
Trace Metals |
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dc.subject |
Southern Ocean |
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dc.subject |
Bonus Goodhope Line |
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dc.subject |
Biogeochemical cycling |
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dc.subject |
Algae |
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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 |
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dc.type |
Abstracts |
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dc.rights.holder |
Antarctic Legacy of South Africa |
en_ZA |
dc.rights.holder |
Cloete, R. |
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dc.rights.holder |
Loock, J.C. |
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dc.rights.holder |
Mtshali, T.M. |
en_ZA |
dc.rights.holder |
Roychoudhury, A.N. |
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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. |
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iso19115.mdformat.name |
PDF |
en_ZA |
iso19115.mdidentification.deliverypoint |
Antarctic Legacy of South Africa, Faculty of Science, Private Bag X1, Matieland. Stellenbosch. South Africa. |
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iso19115.mdidentification.electronicmailaddress |
[email protected] |
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iso19115.mdidentification.organizationname |
Stellenbosch University |
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iso19115.mdidentification.organizationname |
Council for Scientific and Industrial Research |
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