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Articles | Volume 21, issue 6
Articles | Volume 21, issue 6
https://doi.org/10.5194/bg-21-1477-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-21-1477-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 6
Research article
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20 Mar 2024
Research article | Highlight paper |  | 20 Mar 2024

Distinct oxygenation modes of the Gulf of Oman over the past 43 000 years – a multi-proxy approach

Nicole Burdanowitz, Gerhard Schmiedl, Birgit Gaye, Philipp M. Munz, and Hartmut Schulz

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This excellent publication uses a multiproxy approach consisting of benthic formaminifera, lipid biomarkers and stable isotopes to study changing redox conditions in the Gulf of Oman during the past 43 kyrs. In large detail, the authors reconstruct periods dominated by either oxygenated conditions or largely oxygen depleted conditions. This high-resolution reconstruction revealed dominantly oxygenated conditions during Marine Isotope Stage 3 with deoxygenation events dominating most of the warmer Dansgaard-Oeschger events.
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We analyse benthic foraminifera, nitrogen isotopes and lipids in a sediment core from the Gulf of Oman to investigate how the oxygen minimum zone (OMZ) and bottom water (BW) oxygenation have reacted to climatic changes since 43 ka. The OMZ and BW deoxygenation was strong during the Holocene, but the OMZ was well ventilated during the LGM period. We found an unstable mode of oscillating oxygenation states, from moderately oxygenated in cold stadials to deoxygenated in warm interstadials in MIS 3.
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