Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations
Hydrothermal iron supply contributes to the Southern Ocean carbon cycle via the regulation of regional export production. However, as hydrothermal iron input estimates are coupled to helium, which are uncertain depending on whether helium inputs are based on ridge spreading rates or inverse modellin...
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Online Access: | https://doi.org/10.3389/fmars.2022.754517 http://ecite.utas.edu.au/149124 |
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ftunivtasecite:oai:ecite.utas.edu.au:149124 2023-05-15T13:42:40+02:00 Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations Tagliabue, A Bowie, AR Holmes, T Latour, P van der Merwe, P Gault-Ringold, M Wuttig, K Resing, JA 2022 application/pdf https://doi.org/10.3389/fmars.2022.754517 http://ecite.utas.edu.au/149124 en eng Frontiers Research Foundation http://ecite.utas.edu.au/149124/1/149124 - Constraining the contribution of hydrothermal iron to Southern Ocean.pdf http://dx.doi.org/10.3389/fmars.2022.754517 Tagliabue, A and Bowie, AR and Holmes, T and Latour, P and van der Merwe, P and Gault-Ringold, M and Wuttig, K and Resing, JA, Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations, Frontiers in Marine Science, 9 Article 754517. ISSN 2296-7745 (2022) [Refereed Article] http://ecite.utas.edu.au/149124 Earth Sciences Oceanography Chemical oceanography Refereed Article PeerReviewed 2022 ftunivtasecite https://doi.org/10.3389/fmars.2022.754517 2022-10-24T22:16:43Z Hydrothermal iron supply contributes to the Southern Ocean carbon cycle via the regulation of regional export production. However, as hydrothermal iron input estimates are coupled to helium, which are uncertain depending on whether helium inputs are based on ridge spreading rates or inverse modelling, questions remain regarding the magnitude of the export production impacts. A particular challenge is the limited observations of dissolved iron (dFe) supply from the abyssal Southern Ocean ridge system to directly assess different hydrothermal iron supply scenarios. We combine ocean biogeochemical modelling with new observations of dFe from the abyssal Southern Ocean to assess the impact of hydrothermal iron supply estimated from either ridge spreading rate or inverse helium modelling on Southern Ocean export production. The hydrothermal contribution to dFe in the upper 250 m reduces 45 fold when supply is based on inverse modelling, relative to those based on spreading rate, translating into a 3673% reduction in the impact of hydrothermal iron on export production. However, only the spreading rate input scheme reproduces observed dFe anomalies >1 nM around the circum-Antarctic ridge. The model correlation with observations drops 3 fold under the inverse modelling input scheme. The best dFe scenario has a residence time for hydrothermal iron that is between 21 and 34 years, highlighting the importance of rapid physical mixing to surface waters. Overall, because of its short residence time, hydrothermal Fe supplied locally by circum-Antarctic ridges is most important to the Southern Ocean carbon cycle and our results highlight decoupling between hydrothermal iron and helium supply. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean eCite UTAS (University of Tasmania) Antarctic Southern Ocean Frontiers in Marine Science 9 |
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 Tagliabue, A Bowie, AR Holmes, T Latour, P van der Merwe, P Gault-Ringold, M Wuttig, K Resing, JA Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations |
topic_facet |
Earth Sciences Oceanography Chemical oceanography |
description |
Hydrothermal iron supply contributes to the Southern Ocean carbon cycle via the regulation of regional export production. However, as hydrothermal iron input estimates are coupled to helium, which are uncertain depending on whether helium inputs are based on ridge spreading rates or inverse modelling, questions remain regarding the magnitude of the export production impacts. A particular challenge is the limited observations of dissolved iron (dFe) supply from the abyssal Southern Ocean ridge system to directly assess different hydrothermal iron supply scenarios. We combine ocean biogeochemical modelling with new observations of dFe from the abyssal Southern Ocean to assess the impact of hydrothermal iron supply estimated from either ridge spreading rate or inverse helium modelling on Southern Ocean export production. The hydrothermal contribution to dFe in the upper 250 m reduces 45 fold when supply is based on inverse modelling, relative to those based on spreading rate, translating into a 3673% reduction in the impact of hydrothermal iron on export production. However, only the spreading rate input scheme reproduces observed dFe anomalies >1 nM around the circum-Antarctic ridge. The model correlation with observations drops 3 fold under the inverse modelling input scheme. The best dFe scenario has a residence time for hydrothermal iron that is between 21 and 34 years, highlighting the importance of rapid physical mixing to surface waters. Overall, because of its short residence time, hydrothermal Fe supplied locally by circum-Antarctic ridges is most important to the Southern Ocean carbon cycle and our results highlight decoupling between hydrothermal iron and helium supply. |
format |
Article in Journal/Newspaper |
author |
Tagliabue, A Bowie, AR Holmes, T Latour, P van der Merwe, P Gault-Ringold, M Wuttig, K Resing, JA |
author_facet |
Tagliabue, A Bowie, AR Holmes, T Latour, P van der Merwe, P Gault-Ringold, M Wuttig, K Resing, JA |
author_sort |
Tagliabue, A |
title |
Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations |
title_short |
Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations |
title_full |
Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations |
title_fullStr |
Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations |
title_full_unstemmed |
Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations |
title_sort |
constraining the contribution of hydrothermal iron to southern ocean export production using deep ocean iron observations |
publisher |
Frontiers Research Foundation |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.754517 http://ecite.utas.edu.au/149124 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
http://ecite.utas.edu.au/149124/1/149124 - Constraining the contribution of hydrothermal iron to Southern Ocean.pdf http://dx.doi.org/10.3389/fmars.2022.754517 Tagliabue, A and Bowie, AR and Holmes, T and Latour, P and van der Merwe, P and Gault-Ringold, M and Wuttig, K and Resing, JA, Constraining the contribution of hydrothermal iron to Southern Ocean export production using deep ocean iron observations, Frontiers in Marine Science, 9 Article 754517. ISSN 2296-7745 (2022) [Refereed Article] http://ecite.utas.edu.au/149124 |
op_doi |
https://doi.org/10.3389/fmars.2022.754517 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1766171439564587008 |