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

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Cited 1 time in scopus
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Title
Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf
Other Titles
라슨 빙붕 홀로세 퇴적물에서 잠재적 철 기원으로 미생물 철 환원 작용
Authors
Jung, Jaewoo
Yoo, Kyu-Cheul
Rosenheim, Brad E.
Conway, Tim M.
Lee, Jae Il
Yoon, Ho Il
Hwang, Chung Yeon
Yang, Kiho
Subt, Christina
Kim, Jinwook
Subject
Science & Technology - Other Topics
Issue Date
2019-12
Citation
Jung, Jaewoo, et al. 2019. "Microbial Fe(III) reduction as a potential iron source from Holocene sediments beneath Larsen Ice Shelf". NATURE COMMUNICATIONS, 10(5786): 1-10.
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.
URI
https://repository.kopri.re.kr/handle/201206/10986
DOI
http://dx.doi.org/10.1038/s41467-019-13741-x
Appears in Collections  
2019-2019, Reconstruction of Antarctic ice sheet and ocean history for the past two million years using sediment records (19-19) / Lee, Jae Il (PE19030)
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