Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends
We report measurements of dissolved iron (dFe, o0.4 mm) in seawater collected from theupper 300m of the water column along the CLIVAR SR3 section south of Tasmania inMarch 1998 (between 421S and 541S) and NovemberDecember 2001 (between 471S and661S). Results from both cruises indicate a general nort...
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ftunivtasecite:oai:ecite.utas.edu.au:54685 2023-05-15T13:40:51+02:00 Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends Sedwick, PN Bowie, AR Trull, T 2008 application/pdf http://www.sciencedirect.com https://doi.org/10.1016/j.dsr.2008.03.011 http://ecite.utas.edu.au/54685 en eng Pergamon-Elsevier Science Ltd http://ecite.utas.edu.au/54685/1/Sedwick_2008_DSRI_SAZ_dFe.pdf http://dx.doi.org/10.1016/j.dsr.2008.03.011 Sedwick, PN and Bowie, AR and Trull, T, Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends, Deep Sea Research Part I: Oceanographic Research Papers, 55, (8) pp. 911-925. ISSN 0967-0637 (2008) [Refereed Article] http://ecite.utas.edu.au/54685 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2008 ftunivtasecite https://doi.org/10.1016/j.dsr.2008.03.011 2019-12-13T21:27:34Z We report measurements of dissolved iron (dFe, o0.4 mm) in seawater collected from theupper 300m of the water column along the CLIVAR SR3 section south of Tasmania inMarch 1998 (between 421S and 541S) and NovemberDecember 2001 (between 471S and661S). Results from both cruises indicate a general north-to-south decrease in mixed-layerdFe concentrations, from values as high as 0.76 nM in the Subtropical Front to uniformlylow concentrations (o0.1 nM) between the Polar Front and the Antarctic continentalshelf. Samples collected from the seasonal sea-ice zone in NovemberDecember 2001provide no evidence of significant dFe inputs from the melting pack ice, which mayexplain the absence of pronounced ice-edge algal blooms in this sector of the SouthernOcean, as implied by satellite ocean-color images. Our data also allow us to infer changesin the dFe concentration of surface waters during the growing season. South of the PolarFront, a comparison of near-surface with subsurface (150m depth) dFe concentrationsin NovemberDecember 2001 suggests a net seasonal biological uptake of at least 0.140.18 nM dFe, of which 0.050.12nM is depleted early in the growing season(before mid December). A comparison of our spring 2001 and fall 1998 data indicates abarely discernible seasonal depletion of dFe ( 0.03nM) within the Polar Frontal Zone.Further north, most of our iron profiles do not exhibit near-surface depletions, and mixedlayerdFe concentrations are sometimes higher in samples from fall 1998 compared tospring 2001; here, the near-surface dFe distributions appear to be dominated by timevaryinginputs of aerosol iron or advection of iron-rich subtropical waters from the north. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic Deep Sea Research Part I: Oceanographic Research Papers 55 8 911 925 |
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 Sedwick, PN Bowie, AR Trull, T Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
We report measurements of dissolved iron (dFe, o0.4 mm) in seawater collected from theupper 300m of the water column along the CLIVAR SR3 section south of Tasmania inMarch 1998 (between 421S and 541S) and NovemberDecember 2001 (between 471S and661S). Results from both cruises indicate a general north-to-south decrease in mixed-layerdFe concentrations, from values as high as 0.76 nM in the Subtropical Front to uniformlylow concentrations (o0.1 nM) between the Polar Front and the Antarctic continentalshelf. Samples collected from the seasonal sea-ice zone in NovemberDecember 2001provide no evidence of significant dFe inputs from the melting pack ice, which mayexplain the absence of pronounced ice-edge algal blooms in this sector of the SouthernOcean, as implied by satellite ocean-color images. Our data also allow us to infer changesin the dFe concentration of surface waters during the growing season. South of the PolarFront, a comparison of near-surface with subsurface (150m depth) dFe concentrationsin NovemberDecember 2001 suggests a net seasonal biological uptake of at least 0.140.18 nM dFe, of which 0.050.12nM is depleted early in the growing season(before mid December). A comparison of our spring 2001 and fall 1998 data indicates abarely discernible seasonal depletion of dFe ( 0.03nM) within the Polar Frontal Zone.Further north, most of our iron profiles do not exhibit near-surface depletions, and mixedlayerdFe concentrations are sometimes higher in samples from fall 1998 compared tospring 2001; here, the near-surface dFe distributions appear to be dominated by timevaryinginputs of aerosol iron or advection of iron-rich subtropical waters from the north. |
format |
Article in Journal/Newspaper |
author |
Sedwick, PN Bowie, AR Trull, T |
author_facet |
Sedwick, PN Bowie, AR Trull, T |
author_sort |
Sedwick, PN |
title |
Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends |
title_short |
Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends |
title_full |
Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends |
title_fullStr |
Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends |
title_full_unstemmed |
Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends |
title_sort |
dissolved iron in the australian sector of the southern ocean (clivar sr3 section): meridional and seasonal trends |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2008 |
url |
http://www.sciencedirect.com https://doi.org/10.1016/j.dsr.2008.03.011 http://ecite.utas.edu.au/54685 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
http://ecite.utas.edu.au/54685/1/Sedwick_2008_DSRI_SAZ_dFe.pdf http://dx.doi.org/10.1016/j.dsr.2008.03.011 Sedwick, PN and Bowie, AR and Trull, T, Dissolved iron in the Australian sector of the Southern Ocean (CLIVAR SR3 section): Meridional and seasonal trends, Deep Sea Research Part I: Oceanographic Research Papers, 55, (8) pp. 911-925. ISSN 0967-0637 (2008) [Refereed Article] http://ecite.utas.edu.au/54685 |
op_doi |
https://doi.org/10.1016/j.dsr.2008.03.011 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
55 |
container_issue |
8 |
container_start_page |
911 |
op_container_end_page |
925 |
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1766141565437214720 |