Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas
Antarctic sea ice is an important temporal reservoir of iron which can boost primary production in the marginal ice zone during the seasonal melt. While studies have reported that Antarctic fast ice bears high concentrations of iron due to the proximity to coastal sources, less clear are the biogeoc...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell Publishing Inc.
2019
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2019JC015221 http://ecite.utas.edu.au/136209 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:136209 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:136209 2023-05-15T13:55:18+02:00 Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas Duprat, L Kanna, N Janssens, J Roukaerts, A Deman, F Townsend, AT Meiners, KM van der Merwe, P Lannuzel, D 2019 application/pdf https://doi.org/10.1029/2019JC015221 http://ecite.utas.edu.au/136209 en eng Wiley-Blackwell Publishing Inc. http://ecite.utas.edu.au/136209/1/136209 - Enhanced iron flux to Antarctic sea ice via dust deposition.pdf http://dx.doi.org/10.1029/2019JC015221 Duprat, L and Kanna, N and Janssens, J and Roukaerts, A and Deman, F and Townsend, AT and Meiners, KM and van der Merwe, P and Lannuzel, D, Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas, Journal of Geophysical Research: Oceans, 124, (12) pp. 8538-8557. ISSN 2169-9275 (2019) [Refereed Article] http://ecite.utas.edu.au/136209 Chemical Sciences Other Chemical Sciences Environmental Chemistry (incl. Atmospheric Chemistry) Refereed Article PeerReviewed 2019 ftunivtasecite https://doi.org/10.1029/2019JC015221 2020-06-15T22:16:17Z Antarctic sea ice is an important temporal reservoir of iron which can boost primary production in the marginal ice zone during the seasonal melt. While studies have reported that Antarctic fast ice bears high concentrations of iron due to the proximity to coastal sources, less clear are the biogeochemical changes this iron pool undergoes during late spring. Here we describe a 3‐week time series of physical and biogeochemical data, including iron, from first‐year coastal fast ice sampled near Davis Station (Prydz Bay, East Antarctica) during late austral spring 2015. Our study shows that dissolved and particulate iron concentrations in sea ice were up to two orders of magnitude higher than in under‐ice seawater. Furthermore, our results indicate a significant contribution of lithogenic iron from the Vestfold Hills (as deduced from the comparison with crustal element ratios) to the particulate iron pool in fast ice after a blizzard event halfway through the time series. Windblown dust represented approximately 75% of the particulate iron found in the ice and is a potential candidate for keeping concentrations of soluble iron stable during our observations. These results suggest that iron entrapped during ice formation, likely from sediments, as well as local input of coastal dust, supports primary productivity in Davis fast ice. As ice‐free land areas are likely to expand over the course of the century, this work highlights the need to quantify iron inputs from continental Antarctic dust and its bioavailability for ice algae and phytoplankton. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice algae Prydz Bay Sea ice eCite UTAS (University of Tasmania) Antarctic East Antarctica Austral Vestfold Hills Prydz Bay Vestfold Davis Station ENVELOPE(77.968,77.968,-68.576,-68.576) Davis-Station ENVELOPE(77.968,77.968,-68.576,-68.576) Journal of Geophysical Research: Oceans 124 12 8538 8557 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Chemical Sciences Other Chemical Sciences Environmental Chemistry (incl. Atmospheric Chemistry) |
spellingShingle |
Chemical Sciences Other Chemical Sciences Environmental Chemistry (incl. Atmospheric Chemistry) Duprat, L Kanna, N Janssens, J Roukaerts, A Deman, F Townsend, AT Meiners, KM van der Merwe, P Lannuzel, D Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas |
topic_facet |
Chemical Sciences Other Chemical Sciences Environmental Chemistry (incl. Atmospheric Chemistry) |
description |
Antarctic sea ice is an important temporal reservoir of iron which can boost primary production in the marginal ice zone during the seasonal melt. While studies have reported that Antarctic fast ice bears high concentrations of iron due to the proximity to coastal sources, less clear are the biogeochemical changes this iron pool undergoes during late spring. Here we describe a 3‐week time series of physical and biogeochemical data, including iron, from first‐year coastal fast ice sampled near Davis Station (Prydz Bay, East Antarctica) during late austral spring 2015. Our study shows that dissolved and particulate iron concentrations in sea ice were up to two orders of magnitude higher than in under‐ice seawater. Furthermore, our results indicate a significant contribution of lithogenic iron from the Vestfold Hills (as deduced from the comparison with crustal element ratios) to the particulate iron pool in fast ice after a blizzard event halfway through the time series. Windblown dust represented approximately 75% of the particulate iron found in the ice and is a potential candidate for keeping concentrations of soluble iron stable during our observations. These results suggest that iron entrapped during ice formation, likely from sediments, as well as local input of coastal dust, supports primary productivity in Davis fast ice. As ice‐free land areas are likely to expand over the course of the century, this work highlights the need to quantify iron inputs from continental Antarctic dust and its bioavailability for ice algae and phytoplankton. |
format |
Article in Journal/Newspaper |
author |
Duprat, L Kanna, N Janssens, J Roukaerts, A Deman, F Townsend, AT Meiners, KM van der Merwe, P Lannuzel, D |
author_facet |
Duprat, L Kanna, N Janssens, J Roukaerts, A Deman, F Townsend, AT Meiners, KM van der Merwe, P Lannuzel, D |
author_sort |
Duprat, L |
title |
Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas |
title_short |
Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas |
title_full |
Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas |
title_fullStr |
Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas |
title_full_unstemmed |
Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas |
title_sort |
enhanced iron flux to antarctic sea ice via dust deposition from ice-free coastal areas |
publisher |
Wiley-Blackwell Publishing Inc. |
publishDate |
2019 |
url |
https://doi.org/10.1029/2019JC015221 http://ecite.utas.edu.au/136209 |
long_lat |
ENVELOPE(77.968,77.968,-68.576,-68.576) ENVELOPE(77.968,77.968,-68.576,-68.576) |
geographic |
Antarctic East Antarctica Austral Vestfold Hills Prydz Bay Vestfold Davis Station Davis-Station |
geographic_facet |
Antarctic East Antarctica Austral Vestfold Hills Prydz Bay Vestfold Davis Station Davis-Station |
genre |
Antarc* Antarctic Antarctica East Antarctica ice algae Prydz Bay Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice algae Prydz Bay Sea ice |
op_relation |
http://ecite.utas.edu.au/136209/1/136209 - Enhanced iron flux to Antarctic sea ice via dust deposition.pdf http://dx.doi.org/10.1029/2019JC015221 Duprat, L and Kanna, N and Janssens, J and Roukaerts, A and Deman, F and Townsend, AT and Meiners, KM and van der Merwe, P and Lannuzel, D, Enhanced iron flux to Antarctic sea ice via dust deposition from ice-free coastal areas, Journal of Geophysical Research: Oceans, 124, (12) pp. 8538-8557. ISSN 2169-9275 (2019) [Refereed Article] http://ecite.utas.edu.au/136209 |
op_doi |
https://doi.org/10.1029/2019JC015221 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
12 |
container_start_page |
8538 |
op_container_end_page |
8557 |
_version_ |
1766261724169633792 |