Journal article
Late inception of a resiliently oxygenated upper ocean
- Abstract:
- Rising oceanic and atmospheric oxygen levels through time have been crucial to enhanced habitability of surface Earth environments. Few redox proxies can track secular variations in dissolved oxygen concentrations ([O2]) around threshold levels for metazoan survival in the upper ocean. We present an extensive compilation of iodine to calcium ratios (I/Ca) in marine carbonates. Our record supports a major rise in atmospheric pO2 at ~400 million years ago (Ma), and reveals a step-change in the oxygenation of the upper ocean to relatively sustainable near-modern conditions at ~200 Ma. An Earth system model demonstrates that a shift in organic matter remineralization to greater depths, which may have been due to increasing size and biomineralization of eukaryotic plankton, likely drove the I/Ca signals at ~200 Ma.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
-
-
(Preview, Accepted manuscript, pdf, 156.3KB, Terms of use)
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- Publisher copy:
- 10.1126/science.aar5372
Authors
+ National Science Foundation of China
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- Funding agency for:
- Luo, G
- Grant:
- 41290260
+ National Key R and D Project of China
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- Funding agency for:
- Luo, G
- Grant:
- 41290260
+ National Science Foundation
More from this funder
- Funding agency for:
- Ridgwell, A
- Thomas, E
- Lu, Z
- Grant:
- OCE-1736771
- OCE 1736538
- OCE-1736542
+ European Research Council
More from this funder
- Funding agency for:
- Ridgwell, A
- Grant:
- OCE-1736771
- Publisher:
- American Association for the Advancement of Science
- Journal:
- Science More from this journal
- Volume:
- 361
- Issue:
- 6398
- Pages:
- 174-177
- Publication date:
- 2018-05-31
- Acceptance date:
- 2018-05-17
- DOI:
- EISSN:
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0036-8075
- ISSN:
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1095-9203
- Pmid:
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29853552
- Language:
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English
- Keywords:
- Pubs id:
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pubs:854866
- UUID:
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uuid:aebceeed-b103-4588-8c13-ff0480686f79
- Local pid:
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pubs:854866
- Source identifiers:
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854866
- Deposit date:
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2018-06-06
Terms of use
- Copyright holder:
- © 2018, American Association for the Advancement of Science
- Copyright date:
- 2018
- Notes:
- This is the author accepted manuscript following peer review version of the article. The final version is available online from American Association for the Advancement of Science at: 10.1126/science.aar5372
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