Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica
The Antarctic continental shelf supports a high level of marine primary productivity and is a globally important carbon dioxide (CO 2 ) sink through the photosynthetic fixation of CO 2 via the biological pump. Sustaining such high productivity requires a large supply of the essential micronutrient i...
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Online Access: | https://doi.org/10.1002/2016JC011687 http://ecite.utas.edu.au/111806 |
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ftunivtasecite:oai:ecite.utas.edu.au:111806 2023-05-15T13:22:03+02:00 Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica Herraiz-Borreguero, L Lannuzel, D van der Merwe, P Treverrow, A Pedro, JB 2016 application/pdf https://doi.org/10.1002/2016JC011687 http://ecite.utas.edu.au/111806 en eng Wiley-Blackwell Publishing, Inc. http://ecite.utas.edu.au/111806/1/Herraiz-Borreguero_et_al-2016-Journal_of_Geophysical_Research-_Oceans (1).pdf http://dx.doi.org/10.1002/2016JC011687 http://purl.org/au-research/grants/arc/DE120100030 Herraiz-Borreguero, L and Lannuzel, D and van der Merwe, P and Treverrow, A and Pedro, JB, Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica, Journal of Geophysical Research: Oceans, 121, (8) pp. 6009-6020. ISSN 2169-9275 (2016) [Refereed Article] http://ecite.utas.edu.au/111806 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2016 ftunivtasecite https://doi.org/10.1002/2016JC011687 2019-12-13T22:12:09Z The Antarctic continental shelf supports a high level of marine primary productivity and is a globally important carbon dioxide (CO 2 ) sink through the photosynthetic fixation of CO 2 via the biological pump. Sustaining such high productivity requires a large supply of the essential micronutrient iron (Fe); however, the pathways for Fe delivery to these zones vary spatially and temporally. Our study is the first to report a previously unquantified source of concentrated bioavailable Fe to Antarctic surface waters. We hypothesize that Fe derived from subglacial processes is delivered to euphotic waters through the accretion (Fe storage) and subsequent melting (Fe release) of a marine-accreted layer of ice at the base of the Amery Ice Shelf (AIS). Using satellite-derived Chlorophyll-a data, we show that the soluble Fe supplied by the melting of the marine ice layer is an order of magnitude larger than the required Fe necessary to sustain the large annual phytoplankton bloom in Prydz Bay. Our finding of high concentrations of Fe in AIS marine ice and recent data on increasing rates of ice shelf basal melt in many of Antarctica's ice shelves should encourage further research into glacial and marine sediment transport beneath ice shelves and their sensitivity to current changes in basal melt. Currently, the distribution, volume, and Fe concentration of Antarctic marine ice is poorly constrained. This uncertainty, combined with variable forecasts of increased rates of ice shelf basal melt, limits our ability to predict future Fe supply to Antarctic coastal waters. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf Ice Shelves Prydz Bay eCite UTAS (University of Tasmania) Antarctic The Antarctic East Antarctica Prydz Bay Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Journal of Geophysical Research: Oceans 121 8 6009 6020 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography Herraiz-Borreguero, L Lannuzel, D van der Merwe, P Treverrow, A Pedro, JB Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
The Antarctic continental shelf supports a high level of marine primary productivity and is a globally important carbon dioxide (CO 2 ) sink through the photosynthetic fixation of CO 2 via the biological pump. Sustaining such high productivity requires a large supply of the essential micronutrient iron (Fe); however, the pathways for Fe delivery to these zones vary spatially and temporally. Our study is the first to report a previously unquantified source of concentrated bioavailable Fe to Antarctic surface waters. We hypothesize that Fe derived from subglacial processes is delivered to euphotic waters through the accretion (Fe storage) and subsequent melting (Fe release) of a marine-accreted layer of ice at the base of the Amery Ice Shelf (AIS). Using satellite-derived Chlorophyll-a data, we show that the soluble Fe supplied by the melting of the marine ice layer is an order of magnitude larger than the required Fe necessary to sustain the large annual phytoplankton bloom in Prydz Bay. Our finding of high concentrations of Fe in AIS marine ice and recent data on increasing rates of ice shelf basal melt in many of Antarctica's ice shelves should encourage further research into glacial and marine sediment transport beneath ice shelves and their sensitivity to current changes in basal melt. Currently, the distribution, volume, and Fe concentration of Antarctic marine ice is poorly constrained. This uncertainty, combined with variable forecasts of increased rates of ice shelf basal melt, limits our ability to predict future Fe supply to Antarctic coastal waters. |
format |
Article in Journal/Newspaper |
author |
Herraiz-Borreguero, L Lannuzel, D van der Merwe, P Treverrow, A Pedro, JB |
author_facet |
Herraiz-Borreguero, L Lannuzel, D van der Merwe, P Treverrow, A Pedro, JB |
author_sort |
Herraiz-Borreguero, L |
title |
Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica |
title_short |
Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica |
title_full |
Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica |
title_fullStr |
Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica |
title_full_unstemmed |
Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica |
title_sort |
large flux of iron from the amery ice shelf marine ice to prydz bay, east antarctica |
publisher |
Wiley-Blackwell Publishing, Inc. |
publishDate |
2016 |
url |
https://doi.org/10.1002/2016JC011687 http://ecite.utas.edu.au/111806 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Antarctic The Antarctic East Antarctica Prydz Bay Amery Amery Ice Shelf |
geographic_facet |
Antarctic The Antarctic East Antarctica Prydz Bay Amery Amery Ice Shelf |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf Ice Shelves Prydz Bay |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf Ice Shelves Prydz Bay |
op_relation |
http://ecite.utas.edu.au/111806/1/Herraiz-Borreguero_et_al-2016-Journal_of_Geophysical_Research-_Oceans (1).pdf http://dx.doi.org/10.1002/2016JC011687 http://purl.org/au-research/grants/arc/DE120100030 Herraiz-Borreguero, L and Lannuzel, D and van der Merwe, P and Treverrow, A and Pedro, JB, Large flux of iron from the Amery Ice Shelf marine ice to Prydz Bay, East Antarctica, Journal of Geophysical Research: Oceans, 121, (8) pp. 6009-6020. ISSN 2169-9275 (2016) [Refereed Article] http://ecite.utas.edu.au/111806 |
op_doi |
https://doi.org/10.1002/2016JC011687 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
8 |
container_start_page |
6009 |
op_container_end_page |
6020 |
_version_ |
1766363085228998656 |