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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CAMBRIDGE UNIV PRESS, 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA
2016
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Online Access: | https://hdl.handle.net/20.500.11937/25274 https://doi.org/10.1017/S095410201600002X |
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ftcurtin:oai:espace.curtin.edu.au:20.500.11937/25274 2023-06-11T04:13:55+02:00 The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization Winton, Victoria Dunbar, G. Atkins, C. Bertler, N. Delmonte, B. Andersson, P. Bowie, A. Edwards, R. 2016 fulltext https://hdl.handle.net/20.500.11937/25274 https://doi.org/10.1017/S095410201600002X unknown CAMBRIDGE UNIV PRESS, 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA http://hdl.handle.net/20.500.11937/25274 doi:10.1017/S095410201600002X Journal Article 2016 ftcurtin https://doi.org/20.500.11937/2527410.1017/S095410201600002X 2023-05-30T19:33:16Z 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<eNd(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 (eNd(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 particles 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 McMurdo Sound Ross Sea Sea ice Victoria Land Curtin University: espace McMurdo Sound Ross Sea Victoria Land Antarctic Science 28 4 250 260 |
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Curtin University: espace |
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ftcurtin |
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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<eNd(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 (eNd(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 particles 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, Victoria Dunbar, G. Atkins, C. Bertler, N. Delmonte, B. Andersson, P. Bowie, A. Edwards, R. |
spellingShingle |
Winton, Victoria Dunbar, G. Atkins, C. Bertler, N. Delmonte, B. Andersson, P. Bowie, A. Edwards, R. The origin of lithogenic sediment in the south-western Ross Sea and implications for iron fertilization |
author_facet |
Winton, Victoria Dunbar, G. Atkins, C. Bertler, N. Delmonte, B. Andersson, P. Bowie, A. Edwards, R. |
author_sort |
Winton, Victoria |
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 |
CAMBRIDGE UNIV PRESS, 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA |
publishDate |
2016 |
url |
https://hdl.handle.net/20.500.11937/25274 https://doi.org/10.1017/S095410201600002X |
geographic |
McMurdo Sound Ross Sea Victoria Land |
geographic_facet |
McMurdo Sound Ross Sea Victoria Land |
genre |
McMurdo Sound Ross Sea Sea ice Victoria Land |
genre_facet |
McMurdo Sound Ross Sea Sea ice Victoria Land |
op_relation |
http://hdl.handle.net/20.500.11937/25274 doi:10.1017/S095410201600002X |
op_doi |
https://doi.org/20.500.11937/2527410.1017/S095410201600002X |
container_title |
Antarctic Science |
container_volume |
28 |
container_issue |
4 |
container_start_page |
250 |
op_container_end_page |
260 |
_version_ |
1768391382495395840 |