Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf

Jaewoo Jung; Kyu Cheul Yoo; Brad E. Rosenheim; Tim M. Conway; Jae Il Lee; Ho Il Yoon; Chung Yeon Hwang; Kiho Yang; Christina Subt; Jinwook Kim

doi:10.1038/s41467-019-13741-x

Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf

Jaewoo Jung, Kyu Cheul Yoo, Brad E. Rosenheim, Tim M. Conway, Jae Il Lee, Ho Il Yoon, Chung Yeon Hwang, Kiho Yang, Christina Subt, Jinwook Kim

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Recent recession of the Larsen Ice Shelf C has revealed microbial alterations of illite in marine sediments, a process typically thought to occur during low-grade metamorphism. In situ breakdown of illite provides a previously-unobserved pathway for the release of dissolved Fe²⁺ to porewaters, thus enhancing clay-rich Antarctic sub-ice shelf sediments as an important source of Fe to Fe-limited surface Southern Ocean waters during ice shelf retreat after the Last Glacial Maximum. When sediments are underneath the ice shelf, Fe²⁺ from microbial reductive dissolution of illite/Fe-oxides may be exported to the water column. However, the initiation of an oxygenated, bioturbated sediment under receding ice shelves may oxidize Fe within surface porewaters, decreasing dissolved Fe²⁺ export to the ocean. Thus, we identify another ice-sheet feedback intimately tied to iron biogeochemistry during climate transitions. Further constraints on the geographical extent of this process will impact our understanding of iron-carbon feedbacks during major deglaciations.

Original language	English
Article number	5786
Journal	Nature communications
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41467-019-13741-x
Publication status	Published - 2019 Dec 1

Bibliographical note

Funding Information:
The present research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2018R1A2B6002036) and Antarctic Project of KOPRI (PE19030) to J.W.K. We thank the science parties and crews of KOPRI icebreaker R/V Araon for their extraordinary efforts to collect samples and data processing (KOPRI ANA03C). Especially, we express our deep appreciation to the late Dr. E. Domack and Dr. Yoon as co-chief scientists of Weddell Sea expedition for their tremendous contributions to this project.

Publisher Copyright:
© 2019, The Author(s).

All Science Journal Classification (ASJC) codes

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
General
Physics and Astronomy(all)

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10.1038/s41467-019-13741-x

Cite this

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title = "Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf",

abstract = "Recent recession of the Larsen Ice Shelf C has revealed microbial alterations of illite in marine sediments, a process typically thought to occur during low-grade metamorphism. In situ breakdown of illite provides a previously-unobserved pathway for the release of dissolved Fe2+ to porewaters, thus enhancing clay-rich Antarctic sub-ice shelf sediments as an important source of Fe to Fe-limited surface Southern Ocean waters during ice shelf retreat after the Last Glacial Maximum. When sediments are underneath the ice shelf, Fe2+ from microbial reductive dissolution of illite/Fe-oxides may be exported to the water column. However, the initiation of an oxygenated, bioturbated sediment under receding ice shelves may oxidize Fe within surface porewaters, decreasing dissolved Fe2+ export to the ocean. Thus, we identify another ice-sheet feedback intimately tied to iron biogeochemistry during climate transitions. Further constraints on the geographical extent of this process will impact our understanding of iron-carbon feedbacks during major deglaciations.",

author = "Jaewoo Jung and Yoo, {Kyu Cheul} and Rosenheim, {Brad E.} and Conway, {Tim M.} and Lee, {Jae Il} and Yoon, {Ho Il} and Hwang, {Chung Yeon} and Kiho Yang and Christina Subt and Jinwook Kim",

note = "Funding Information: The present research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2018R1A2B6002036) and Antarctic Project of KOPRI (PE19030) to J.W.K. We thank the science parties and crews of KOPRI icebreaker R/V Araon for their extraordinary efforts to collect samples and data processing (KOPRI ANA03C). Especially, we express our deep appreciation to the late Dr. E. Domack and Dr. Yoon as co-chief scientists of Weddell Sea expedition for their tremendous contributions to this project. Publisher Copyright: {\textcopyright} 2019, The Author(s).",

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N2 - Recent recession of the Larsen Ice Shelf C has revealed microbial alterations of illite in marine sediments, a process typically thought to occur during low-grade metamorphism. In situ breakdown of illite provides a previously-unobserved pathway for the release of dissolved Fe2+ to porewaters, thus enhancing clay-rich Antarctic sub-ice shelf sediments as an important source of Fe to Fe-limited surface Southern Ocean waters during ice shelf retreat after the Last Glacial Maximum. When sediments are underneath the ice shelf, Fe2+ from microbial reductive dissolution of illite/Fe-oxides may be exported to the water column. However, the initiation of an oxygenated, bioturbated sediment under receding ice shelves may oxidize Fe within surface porewaters, decreasing dissolved Fe2+ export to the ocean. Thus, we identify another ice-sheet feedback intimately tied to iron biogeochemistry during climate transitions. Further constraints on the geographical extent of this process will impact our understanding of iron-carbon feedbacks during major deglaciations.

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Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf

Abstract

Bibliographical note

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UN SDGs

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