Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica
The Antarctic continental shelf supports a high level of marine primary productivity and is a globally importantcarbon dioxide (CO 2 ) sink through the photosynthetic fixation of CO 2 via the biological pump. Sustaining suchhigh productivity requires a large supply of the essential micronutrient iro...
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ftunivtasecite:oai:ecite.utas.edu.au:125953 2023-05-15T13:22:04+02:00 Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica Herraiz-Borreguero, L Lannuzel, D van der Merwe, PC Treverrow, A Pedro, JB 2018 application/pdf http://ecite.utas.edu.au/125953 en eng Copernicus GmbH http://ecite.utas.edu.au/125953/1/2018_Herraiz-Borreguerro_EGU_AIS_Fe_paper.pdf http://ecite.utas.edu.au/125953/2/2018_Herraiz-Borreguerro_EGU_AIS_Fe_paper_program.pdf Herraiz-Borreguero, L and Lannuzel, D and van der Merwe, PC and Treverrow, A and Pedro, JB, Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica, Geophysical Research Abstracts, 08-13 April, Vienna, Austria, pp. 18537. ISSN 1607-7962 (2018) [Conference Extract] http://ecite.utas.edu.au/125953 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Conference Extract NonPeerReviewed 2018 ftunivtasecite 2019-12-13T22:24:25Z The Antarctic continental shelf supports a high level of marine primary productivity and is a globally importantcarbon dioxide (CO 2 ) sink through the photosynthetic fixation of CO 2 via the biological pump. Sustaining suchhigh productivity requires a large supply of the essential micronutrient iron (Fe); however, the pathways for Fedelivery to these zones vary spatially and temporally. Our study is the first to report a previously unquantifiedsource of concentrated bio-available Fe to East Antarctic surface waters. We hypothesize that Fe derived fromsubglacial processes is delivered to euphotic waters through the accretion (Fe storage) and subsequent melting (Ferelease) of a marine-accreted layer of ice at the base of the Amery Ice Shelf. Using satellite-derived Chlorophyll-adata, we show that the soluble Fe supplied by the melting of the marine ice layer is an order of magnitude largerthan the required Fe necessary to sustain the large annual phytoplankton bloom in Prydz Bay. Our finding of highconcentrations of Fe in AIS marine ice and recent data on increasing rates of ice shelf basal melt in many ofAntarcticas ice shelves [Paolo et al., 2015] should encourage further research into glacial and marine sedimenttransport beneath ice shelves and their sensitivity to current changes in basal melt. This research also encouragenew research into the formation of marine ice and its vulnerability to a warming ocean. Currently, the distribution,volume and Fe concentration of Antarctic marine ice is poorly constrained. This uncertainty, combined withvariable forecasts of increased rates of ice shelf basal melt, limits our ability to predict future Fe supply toAntarctic coastal waters. Conference Object Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Prydz Bay eCite UTAS (University of Tasmania) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Antarctic East Antarctica Prydz Bay The Antarctic |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Herraiz-Borreguero, L Lannuzel, D van der Merwe, PC Treverrow, A Pedro, JB Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
The Antarctic continental shelf supports a high level of marine primary productivity and is a globally importantcarbon dioxide (CO 2 ) sink through the photosynthetic fixation of CO 2 via the biological pump. Sustaining suchhigh productivity requires a large supply of the essential micronutrient iron (Fe); however, the pathways for Fedelivery to these zones vary spatially and temporally. Our study is the first to report a previously unquantifiedsource of concentrated bio-available Fe to East Antarctic surface waters. We hypothesize that Fe derived fromsubglacial processes is delivered to euphotic waters through the accretion (Fe storage) and subsequent melting (Ferelease) of a marine-accreted layer of ice at the base of the Amery Ice Shelf. Using satellite-derived Chlorophyll-adata, we show that the soluble Fe supplied by the melting of the marine ice layer is an order of magnitude largerthan the required Fe necessary to sustain the large annual phytoplankton bloom in Prydz Bay. Our finding of highconcentrations of Fe in AIS marine ice and recent data on increasing rates of ice shelf basal melt in many ofAntarcticas ice shelves [Paolo et al., 2015] should encourage further research into glacial and marine sedimenttransport beneath ice shelves and their sensitivity to current changes in basal melt. This research also encouragenew research into the formation of marine ice and its vulnerability to a warming ocean. Currently, the distribution,volume and Fe concentration of Antarctic marine ice is poorly constrained. This uncertainty, combined withvariable forecasts of increased rates of ice shelf basal melt, limits our ability to predict future Fe supply toAntarctic coastal waters. |
format |
Conference Object |
author |
Herraiz-Borreguero, L Lannuzel, D van der Merwe, PC Treverrow, A Pedro, JB |
author_facet |
Herraiz-Borreguero, L Lannuzel, D van der Merwe, PC Treverrow, A Pedro, JB |
author_sort |
Herraiz-Borreguero, L |
title |
Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica |
title_short |
Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica |
title_full |
Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica |
title_fullStr |
Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica |
title_full_unstemmed |
Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica |
title_sort |
iron fertilization from the amery ice shelf marine ice layer, east antarctica |
publisher |
Copernicus GmbH |
publishDate |
2018 |
url |
http://ecite.utas.edu.au/125953 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf Antarctic East Antarctica Prydz Bay The Antarctic |
geographic_facet |
Amery Amery Ice Shelf Antarctic East Antarctica Prydz Bay The Antarctic |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Prydz Bay |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ice Shelves Prydz Bay |
op_relation |
http://ecite.utas.edu.au/125953/1/2018_Herraiz-Borreguerro_EGU_AIS_Fe_paper.pdf http://ecite.utas.edu.au/125953/2/2018_Herraiz-Borreguerro_EGU_AIS_Fe_paper_program.pdf Herraiz-Borreguero, L and Lannuzel, D and van der Merwe, PC and Treverrow, A and Pedro, JB, Iron fertilization from the Amery Ice Shelf marine ice layer, East Antarctica, Geophysical Research Abstracts, 08-13 April, Vienna, Austria, pp. 18537. ISSN 1607-7962 (2018) [Conference Extract] http://ecite.utas.edu.au/125953 |
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1766363146273947648 |