Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt
Iron is a fundamental nutrient limiting phytoplankton growth in vast regions of the Southern Ocean. Sea ice, which covers 80% of the Southern Ocean (south of 60S) during maximum extent, can concentrate iron up to two orders of magnitude higher than in the underlying sea water. The fractionation of i...
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ftunivtasecite:oai:ecite.utas.edu.au:72242 2023-05-15T14:02:30+02:00 Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt Van Der Merwe, P Lannuzel, D Bowie, AR Mancuso Nichols, CA Meiners, K 2011 application/pdf https://doi.org/10.1016/j.dsr2.2010.10.036 http://ecite.utas.edu.au/72242 en eng Pergamon-Elsevier Science Ltd http://ecite.utas.edu.au/72242/1/van der Merwe et al 2011a_Deep-Search ResearchII.pdf http://dx.doi.org/10.1016/j.dsr2.2010.10.036 Van Der Merwe, P and Lannuzel, D and Bowie, AR and Mancuso Nichols, CA and Meiners, K, Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt, Deep-Sea Research. Part II: Topical Studies in Oceanography, 58, (9-10) pp. 1222-1236. ISSN 0967-0645 (2011) [Refereed Article] http://ecite.utas.edu.au/72242 Environmental Sciences Ecological Applications Ecosystem Function Refereed Article PeerReviewed 2011 ftunivtasecite https://doi.org/10.1016/j.dsr2.2010.10.036 2019-12-13T21:39:36Z Iron is a fundamental nutrient limiting phytoplankton growth in vast regions of the Southern Ocean. Sea ice, which covers 80% of the Southern Ocean (south of 60S) during maximum extent, can concentrate iron up to two orders of magnitude higher than in the underlying sea water. The fractionation of iron between the particulate and dissolved fractions depends on the location and type of sea-ice formation and can impact on the bioavailability of this important trace element. This study is the first to document iron fractionation and concentration in both pack and fast ice during a single research study. Sampling was from within the 110130E sector of Antarctica. We observed markedly higher concentrations of particulate iron at our fast-ice site (0.96214 nM) relative to several pack-ice sites (0.8777.7 nM). A high particulate-to-dissolved iron ratio was observed at the fast-ice site (285:1) relative to the highest observed in pack ice (23:1). This suggests a decoupling between the sources and/or sinks of the dissolved and particulate fractions. Preferential release of dissolved iron (and not particulate iron) into brines at all sites sampled with the sack hole method (and therefore indicative of brine drainage) indicates the diffuse nature of the dissolved fraction. Furthermore, this indicates that there may be a temporal decoupling between the release of the dissolved and the particulate fractions into the water column as sea ice becomes more permeable during the seasonal melt. Implications for phytoplankton production in Antarctic sea ice are discussed. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean eCite UTAS (University of Tasmania) Antarctic East Antarctica Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 58 9-10 1222 1236 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Environmental Sciences Ecological Applications Ecosystem Function |
spellingShingle |
Environmental Sciences Ecological Applications Ecosystem Function Van Der Merwe, P Lannuzel, D Bowie, AR Mancuso Nichols, CA Meiners, K Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt |
topic_facet |
Environmental Sciences Ecological Applications Ecosystem Function |
description |
Iron is a fundamental nutrient limiting phytoplankton growth in vast regions of the Southern Ocean. Sea ice, which covers 80% of the Southern Ocean (south of 60S) during maximum extent, can concentrate iron up to two orders of magnitude higher than in the underlying sea water. The fractionation of iron between the particulate and dissolved fractions depends on the location and type of sea-ice formation and can impact on the bioavailability of this important trace element. This study is the first to document iron fractionation and concentration in both pack and fast ice during a single research study. Sampling was from within the 110130E sector of Antarctica. We observed markedly higher concentrations of particulate iron at our fast-ice site (0.96214 nM) relative to several pack-ice sites (0.8777.7 nM). A high particulate-to-dissolved iron ratio was observed at the fast-ice site (285:1) relative to the highest observed in pack ice (23:1). This suggests a decoupling between the sources and/or sinks of the dissolved and particulate fractions. Preferential release of dissolved iron (and not particulate iron) into brines at all sites sampled with the sack hole method (and therefore indicative of brine drainage) indicates the diffuse nature of the dissolved fraction. Furthermore, this indicates that there may be a temporal decoupling between the release of the dissolved and the particulate fractions into the water column as sea ice becomes more permeable during the seasonal melt. Implications for phytoplankton production in Antarctic sea ice are discussed. |
format |
Article in Journal/Newspaper |
author |
Van Der Merwe, P Lannuzel, D Bowie, AR Mancuso Nichols, CA Meiners, K |
author_facet |
Van Der Merwe, P Lannuzel, D Bowie, AR Mancuso Nichols, CA Meiners, K |
author_sort |
Van Der Merwe, P |
title |
Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt |
title_short |
Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt |
title_full |
Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt |
title_fullStr |
Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt |
title_full_unstemmed |
Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt |
title_sort |
iron fractionation in pack and fast ice in east antarctica: temporal decoupling between the release of dissolved and particulate iron during spring melt |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2011 |
url |
https://doi.org/10.1016/j.dsr2.2010.10.036 http://ecite.utas.edu.au/72242 |
geographic |
Antarctic East Antarctica Southern Ocean |
geographic_facet |
Antarctic East Antarctica Southern Ocean |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice Southern Ocean |
op_relation |
http://ecite.utas.edu.au/72242/1/van der Merwe et al 2011a_Deep-Search ResearchII.pdf http://dx.doi.org/10.1016/j.dsr2.2010.10.036 Van Der Merwe, P and Lannuzel, D and Bowie, AR and Mancuso Nichols, CA and Meiners, K, Iron fractionation in pack and fast ice in East Antarctica: Temporal decoupling between the release of dissolved and particulate iron during spring melt, Deep-Sea Research. Part II: Topical Studies in Oceanography, 58, (9-10) pp. 1222-1236. ISSN 0967-0645 (2011) [Refereed Article] http://ecite.utas.edu.au/72242 |
op_doi |
https://doi.org/10.1016/j.dsr2.2010.10.036 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
58 |
container_issue |
9-10 |
container_start_page |
1222 |
op_container_end_page |
1236 |
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1766272772809424896 |