Iron cycling in Arctic methane seeps
Anoxic marine sediments contribute a significant amount of dissolved iron (Fe2+) to the ocean which is crucial for the global carbon cycle. Here, we investigate iron cycling in four Arctic cold seeps where sediments are anoxic and sulfidic due to the high rates of methane-fueled sulfate reduction. W...
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ftiupui:oai:scholarworks.iupui.edu:1805/24031 2023-10-09T21:47:39+02:00 Iron cycling in Arctic methane seeps Hong, Wei-Li Latour, Pauline Sauer, Simone Sen, Arunima Gilhooly, William P., III Lepland, Aivo Fouskas, Fotios Earth Sciences, School of Science 2020 application/pdf https://hdl.handle.net/1805/24031 en eng Springer 10.1007/s00367-020-00649-5 Geo-Marine Letters Hong, W.-L., Latour, P., Sauer, S., Sen, A., Gilhooly, W. P., Lepland, A., & Fouskas, F. (2020). Iron cycling in Arctic methane seeps. Geo-Marine Letters, 40(3), 391–401. https://doi.org/10.1007/s00367-020-00649-5 https://hdl.handle.net/1805/24031 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ Publisher arctic methane seeps iron cycling Arctic cold seeps Article 2020 ftiupui 2023-09-22T14:29:05Z Anoxic marine sediments contribute a significant amount of dissolved iron (Fe2+) to the ocean which is crucial for the global carbon cycle. Here, we investigate iron cycling in four Arctic cold seeps where sediments are anoxic and sulfidic due to the high rates of methane-fueled sulfate reduction. We estimated Fe2+ diffusive fluxes towards the oxic sediment layer to be in the range of 0.8 to 138.7 μmole/m2/day and Fe2+ fluxes across the sediment-water interface to be in the range of 0.3 to 102.2 μmole/m2/day. Such variable fluxes cannot be explained by Fe2+ production from organic matter–coupled dissimilatory reduction alone. We propose that the reduction of dissolved and complexed Fe3+ as well as the rapid formation of iron sulfide minerals are the most important reactions regulating the fluxes of Fe2+ in these cold seeps. By comparing seafloor visual observations with subsurface pore fluid composition, we demonstrate how the joint cycling of iron and sulfur determines the distribution of chemosynthesis-based biota. Article in Journal/Newspaper Arctic arctic methane Arctic Indiana University - Purdue University Indianapolis: IUPUI Scholar Works Arctic Geo-Marine Letters 40 3 391 401 |
institution |
Open Polar |
collection |
Indiana University - Purdue University Indianapolis: IUPUI Scholar Works |
op_collection_id |
ftiupui |
language |
English |
topic |
arctic methane seeps iron cycling Arctic cold seeps |
spellingShingle |
arctic methane seeps iron cycling Arctic cold seeps Hong, Wei-Li Latour, Pauline Sauer, Simone Sen, Arunima Gilhooly, William P., III Lepland, Aivo Fouskas, Fotios Iron cycling in Arctic methane seeps |
topic_facet |
arctic methane seeps iron cycling Arctic cold seeps |
description |
Anoxic marine sediments contribute a significant amount of dissolved iron (Fe2+) to the ocean which is crucial for the global carbon cycle. Here, we investigate iron cycling in four Arctic cold seeps where sediments are anoxic and sulfidic due to the high rates of methane-fueled sulfate reduction. We estimated Fe2+ diffusive fluxes towards the oxic sediment layer to be in the range of 0.8 to 138.7 μmole/m2/day and Fe2+ fluxes across the sediment-water interface to be in the range of 0.3 to 102.2 μmole/m2/day. Such variable fluxes cannot be explained by Fe2+ production from organic matter–coupled dissimilatory reduction alone. We propose that the reduction of dissolved and complexed Fe3+ as well as the rapid formation of iron sulfide minerals are the most important reactions regulating the fluxes of Fe2+ in these cold seeps. By comparing seafloor visual observations with subsurface pore fluid composition, we demonstrate how the joint cycling of iron and sulfur determines the distribution of chemosynthesis-based biota. |
author2 |
Earth Sciences, School of Science |
format |
Article in Journal/Newspaper |
author |
Hong, Wei-Li Latour, Pauline Sauer, Simone Sen, Arunima Gilhooly, William P., III Lepland, Aivo Fouskas, Fotios |
author_facet |
Hong, Wei-Li Latour, Pauline Sauer, Simone Sen, Arunima Gilhooly, William P., III Lepland, Aivo Fouskas, Fotios |
author_sort |
Hong, Wei-Li |
title |
Iron cycling in Arctic methane seeps |
title_short |
Iron cycling in Arctic methane seeps |
title_full |
Iron cycling in Arctic methane seeps |
title_fullStr |
Iron cycling in Arctic methane seeps |
title_full_unstemmed |
Iron cycling in Arctic methane seeps |
title_sort |
iron cycling in arctic methane seeps |
publisher |
Springer |
publishDate |
2020 |
url |
https://hdl.handle.net/1805/24031 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic arctic methane Arctic |
genre_facet |
Arctic arctic methane Arctic |
op_source |
Publisher |
op_relation |
10.1007/s00367-020-00649-5 Geo-Marine Letters Hong, W.-L., Latour, P., Sauer, S., Sen, A., Gilhooly, W. P., Lepland, A., & Fouskas, F. (2020). Iron cycling in Arctic methane seeps. Geo-Marine Letters, 40(3), 391–401. https://doi.org/10.1007/s00367-020-00649-5 https://hdl.handle.net/1805/24031 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
container_title |
Geo-Marine Letters |
container_volume |
40 |
container_issue |
3 |
container_start_page |
391 |
op_container_end_page |
401 |
_version_ |
1779310727619674112 |