4.8 Article

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

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NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -

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NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-13741-x

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  1. National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2018R1A2B6002036]
  2. Antarctic Project of KOPRI [PE19030]
  3. Korea Polar Research Institute of Marine Research Placement (KOPRI) [PE19030] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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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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