Articles | Volume 21, issue 6
https://doi.org/10.5194/bg-21-1477-2024
https://doi.org/10.5194/bg-21-1477-2024
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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Cited articles

Acharya, S. S. and Panigrahi, M. K.: Eastward shift and maintenance of Arabian Sea oxygen minimum zone: Understanding the paradox, Deep-Sea Res. Pt. I, 115, 240–252, https://doi.org/10.1016/j.dsr.2016.07.004, 2016. 
Allard, J. L., Hughes, P. D., and Woodward, J. C.: Heinrich Stadial aridity forced Mediterranean-wide glacier retreat in the last cold stage, Nat. Geosci., 14, 197–205, https://doi.org/10.1038/s41561-021-00703-6, 2021. 
Altabet, M. A., Francois, R., Murray, D. W., and Prell, W. L.: Climate-related variations in denitrification in the Arabian Sea from sediment 15N/14N ratios, Nature, 373, 506–509, https://doi.org/10.1038/373506a0, 1995. 
Altabet, M. A., Pilskaln, C., Thunell, R., Pride, C., Sigman, D., Chavez, F., and Francois, R.: The nitrogen isotope biogeochemistry of sinking particles from the margin of the Eastern North Pacific, Deep-Sea Res. Pt. I, 46, 655–679, https://doi.org/10.1016/S0967-0637(98)00084-3, 1999. 
Altabet, M. A., Higginson, M. J., and Murray, D. W.: The effect of millennial-scale changes in Arabian Sea denitrification on atmospheric CO2, Nature, 415, 159–162, https://doi.org/10.1038/415159a, 2002. 
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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.
Short summary
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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