On the importance of hydrothermalism to the oceanic dissolved iron inventory
Iron limits phytoplankton growth and the biological carbon pump in large areas of the worlds oceans, including the climatically important Southern Ocean. Studies attempting to address how changes in iron supply impact the global carbon cycle rely on global models of ocean circulation and biogeochemi...
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ftunivtasecite:oai:ecite.utas.edu.au:71334 2023-05-15T18:24:26+02:00 On the importance of hydrothermalism to the oceanic dissolved iron inventory Tagliabue, A Bopp, L Dutay, J Bowie, AR Chever, F Jean-Baptiste, P Bucciarelli, E Lannuzel, D Remenyi, TA Sarthou, G Aumont, O Gehlen, M Jeandel, C 2010 http://ecite.utas.edu.au/71334 en eng American Geophysical Union Tagliabue, A and Bopp, L and Dutay, J and Bowie, AR and Chever, F and Jean-Baptiste, P and Bucciarelli, E and Lannuzel, D and Remenyi, TA and Sarthou, G and Aumont, O and Gehlen, M and Jeandel, C, On the importance of hydrothermalism to the oceanic dissolved iron inventory, EOS Transactions, Ocean Sciences Meeting Supplement, 22-26 February 2010, Portland, Oregon, pp. Abstract CO14A-04. (2010) [Conference Extract] http://ecite.utas.edu.au/71334 Earth Sciences Oceanography Chemical Oceanography Conference Extract NonPeerReviewed 2010 ftunivtasecite 2019-12-13T21:38:51Z Iron limits phytoplankton growth and the biological carbon pump in large areas of the worlds oceans, including the climatically important Southern Ocean. Studies attempting to address how changes in iron supply impact the global carbon cycle rely on global models of ocean circulation and biogeochemistry that typically include dust and continental margins as their predominant iron sources. However, recent observational studies have highlighted the potential importance of an additional iron source from deep-ocean hydrothermalism. In light of this, our prior understanding of the oceanic iron cycle must be re-evaluated. Here we show that hydrothermal iron sources are important in governing the oceanic iron inventory and reproducing dissolved iron observations in a global model. Helium isotopes and iron data are compiled to parameterise the hydrothermal source of dissolved iron using prior observational studies as additional constraints. Importantly, new deep-ocean datasets from two distinct Southern Ocean basins are used to statistically evaluate model results. The deep ocean iron data collected during GEOTRACES cruises to the Southern Ocean suggest that hydrothermal Fe needs to be included in models in order to reproduce observations. Hydrothermalism can increase the biological carbon pump by 20-30% in the Southern Ocean and the impact of variability in the assumed hydrothermal flux is non-linear. We suggest a revised model of the marine iron cycle, particularly for the iron-limited Southern Ocean, with a role for different iron sources over distinct timescales. Due to its relative constancy at millennial timescales, hydrothermalism can buffer the oceanic dissolved iron inventory against shorter-term variability in other sources, such as dust deposition. Conference Object Southern Ocean eCite UTAS (University of Tasmania) Southern Ocean |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
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Earth Sciences Oceanography Chemical Oceanography Tagliabue, A Bopp, L Dutay, J Bowie, AR Chever, F Jean-Baptiste, P Bucciarelli, E Lannuzel, D Remenyi, TA Sarthou, G Aumont, O Gehlen, M Jeandel, C On the importance of hydrothermalism to the oceanic dissolved iron inventory |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
Iron limits phytoplankton growth and the biological carbon pump in large areas of the worlds oceans, including the climatically important Southern Ocean. Studies attempting to address how changes in iron supply impact the global carbon cycle rely on global models of ocean circulation and biogeochemistry that typically include dust and continental margins as their predominant iron sources. However, recent observational studies have highlighted the potential importance of an additional iron source from deep-ocean hydrothermalism. In light of this, our prior understanding of the oceanic iron cycle must be re-evaluated. Here we show that hydrothermal iron sources are important in governing the oceanic iron inventory and reproducing dissolved iron observations in a global model. Helium isotopes and iron data are compiled to parameterise the hydrothermal source of dissolved iron using prior observational studies as additional constraints. Importantly, new deep-ocean datasets from two distinct Southern Ocean basins are used to statistically evaluate model results. The deep ocean iron data collected during GEOTRACES cruises to the Southern Ocean suggest that hydrothermal Fe needs to be included in models in order to reproduce observations. Hydrothermalism can increase the biological carbon pump by 20-30% in the Southern Ocean and the impact of variability in the assumed hydrothermal flux is non-linear. We suggest a revised model of the marine iron cycle, particularly for the iron-limited Southern Ocean, with a role for different iron sources over distinct timescales. Due to its relative constancy at millennial timescales, hydrothermalism can buffer the oceanic dissolved iron inventory against shorter-term variability in other sources, such as dust deposition. |
format |
Conference Object |
author |
Tagliabue, A Bopp, L Dutay, J Bowie, AR Chever, F Jean-Baptiste, P Bucciarelli, E Lannuzel, D Remenyi, TA Sarthou, G Aumont, O Gehlen, M Jeandel, C |
author_facet |
Tagliabue, A Bopp, L Dutay, J Bowie, AR Chever, F Jean-Baptiste, P Bucciarelli, E Lannuzel, D Remenyi, TA Sarthou, G Aumont, O Gehlen, M Jeandel, C |
author_sort |
Tagliabue, A |
title |
On the importance of hydrothermalism to the oceanic dissolved iron inventory |
title_short |
On the importance of hydrothermalism to the oceanic dissolved iron inventory |
title_full |
On the importance of hydrothermalism to the oceanic dissolved iron inventory |
title_fullStr |
On the importance of hydrothermalism to the oceanic dissolved iron inventory |
title_full_unstemmed |
On the importance of hydrothermalism to the oceanic dissolved iron inventory |
title_sort |
on the importance of hydrothermalism to the oceanic dissolved iron inventory |
publisher |
American Geophysical Union |
publishDate |
2010 |
url |
http://ecite.utas.edu.au/71334 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Tagliabue, A and Bopp, L and Dutay, J and Bowie, AR and Chever, F and Jean-Baptiste, P and Bucciarelli, E and Lannuzel, D and Remenyi, TA and Sarthou, G and Aumont, O and Gehlen, M and Jeandel, C, On the importance of hydrothermalism to the oceanic dissolved iron inventory, EOS Transactions, Ocean Sciences Meeting Supplement, 22-26 February 2010, Portland, Oregon, pp. Abstract CO14A-04. (2010) [Conference Extract] http://ecite.utas.edu.au/71334 |
_version_ |
1766204932054056960 |