The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization
Summer iron (Fe) fertilization in the Ross Sea has previously been observed in association with diatom productivity, lithogenic particles and excess Fe in the water column. This productivity event occurred during an early breakout of sea ice via katabatic winds, suggesting that aeolian dust could be...
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ftnrm:oai:DiVA.org:nrm-1796 2023-05-15T14:05:22+02:00 The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization Winton, V.H.L. Dunbar, G.B. Atkins, C.B. Bertler, N.A.N. Delmonte, Barbara Andersson, Per Bowie, A Edwards, R. 2016 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-1796 https://doi.org/10.1017/S095410201600002X eng eng Enheten för geovetenskap Curtin University, Perth Antarctic Research Centre, Wellington Victoria University, Wellington University of Milano-Bicocca, Milano University of Tasmania, Hobart Cambridge Antarctic Science, 0954-1020, 2016, 28:4, s. 250-260 http://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-1796 doi:10.1017/S095410201600002X info:eu-repo/semantics/openAccess Antarctica Ross Sea iron fertilization Sr Nd isotopes Geochemistry Geokemi Article in journal info:eu-repo/semantics/article text 2016 ftnrm https://doi.org/10.1017/S095410201600002X 2021-10-08T07:21:14Z Summer iron (Fe) fertilization in the Ross Sea has previously been observed in association with diatom productivity, lithogenic particles and excess Fe in the water column. This productivity event occurred during an early breakout of sea ice via katabatic winds, suggesting that aeolian dust could be an important source of lithogenic Fe required for diatom growth in the Ross Sea. Here we investigate the provenance of size-selected dust deposited on sea ice in McMurdo Sound, south-western (SW) Ross Sea. The isotopic signature of McMurdo Sound dust (0.70533< 87Sr/86Sr< 0.70915 and -1.1 < εNd(0) <3.45)confirms that dust is locally sourced from the McMurdo Sound debris bands and comprises a two-component mixture of McMurdo Volcanic Group and southern Victoria Land lithologies. In addition, the provenance of lithogenic sediment trapped in the water column was investigated, and the isotopic signature (εNd(0) =3.9, 87Sr/86Sr = 0.70434) is differentiated from long-range transported dust originating from South America and Australia. Elevated lithogenic accumulation rates in deeper sediment traps in the Ross Sea suggest that sinking articles in the water column cannot simply result from dust input at the surface. This discrepancy can be best explained by significant upwelling and remobilization of lithogenic Fe from the sea floor. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica McMurdo Sound Ross Sea Sea ice Victoria Land Swedish Museum of Natural History: Publications (DiVA) McMurdo Sound Ross Sea Victoria Land Antarctic Science 28 4 250 260 |
institution |
Open Polar |
collection |
Swedish Museum of Natural History: Publications (DiVA) |
op_collection_id |
ftnrm |
language |
English |
topic |
Antarctica Ross Sea iron fertilization Sr Nd isotopes Geochemistry Geokemi |
spellingShingle |
Antarctica Ross Sea iron fertilization Sr Nd isotopes Geochemistry Geokemi Winton, V.H.L. Dunbar, G.B. Atkins, C.B. Bertler, N.A.N. Delmonte, Barbara Andersson, Per Bowie, A Edwards, R. The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization |
topic_facet |
Antarctica Ross Sea iron fertilization Sr Nd isotopes Geochemistry Geokemi |
description |
Summer iron (Fe) fertilization in the Ross Sea has previously been observed in association with diatom productivity, lithogenic particles and excess Fe in the water column. This productivity event occurred during an early breakout of sea ice via katabatic winds, suggesting that aeolian dust could be an important source of lithogenic Fe required for diatom growth in the Ross Sea. Here we investigate the provenance of size-selected dust deposited on sea ice in McMurdo Sound, south-western (SW) Ross Sea. The isotopic signature of McMurdo Sound dust (0.70533< 87Sr/86Sr< 0.70915 and -1.1 < εNd(0) <3.45)confirms that dust is locally sourced from the McMurdo Sound debris bands and comprises a two-component mixture of McMurdo Volcanic Group and southern Victoria Land lithologies. In addition, the provenance of lithogenic sediment trapped in the water column was investigated, and the isotopic signature (εNd(0) =3.9, 87Sr/86Sr = 0.70434) is differentiated from long-range transported dust originating from South America and Australia. Elevated lithogenic accumulation rates in deeper sediment traps in the Ross Sea suggest that sinking articles in the water column cannot simply result from dust input at the surface. This discrepancy can be best explained by significant upwelling and remobilization of lithogenic Fe from the sea floor. |
format |
Article in Journal/Newspaper |
author |
Winton, V.H.L. Dunbar, G.B. Atkins, C.B. Bertler, N.A.N. Delmonte, Barbara Andersson, Per Bowie, A Edwards, R. |
author_facet |
Winton, V.H.L. Dunbar, G.B. Atkins, C.B. Bertler, N.A.N. Delmonte, Barbara Andersson, Per Bowie, A Edwards, R. |
author_sort |
Winton, V.H.L. |
title |
The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization |
title_short |
The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization |
title_full |
The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization |
title_fullStr |
The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization |
title_full_unstemmed |
The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization |
title_sort |
origin of lithogenic sediment in the south-western ross sea and implications for iron fertilization |
publisher |
Enheten för geovetenskap |
publishDate |
2016 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-1796 https://doi.org/10.1017/S095410201600002X |
geographic |
McMurdo Sound Ross Sea Victoria Land |
geographic_facet |
McMurdo Sound Ross Sea Victoria Land |
genre |
Antarc* Antarctic Science Antarctica McMurdo Sound Ross Sea Sea ice Victoria Land |
genre_facet |
Antarc* Antarctic Science Antarctica McMurdo Sound Ross Sea Sea ice Victoria Land |
op_relation |
Antarctic Science, 0954-1020, 2016, 28:4, s. 250-260 http://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-1796 doi:10.1017/S095410201600002X |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/S095410201600002X |
container_title |
Antarctic Science |
container_volume |
28 |
container_issue |
4 |
container_start_page |
250 |
op_container_end_page |
260 |
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1766277184943554560 |