Abstract
AbstractUnravelling past, large-scale ocean circulation patterns is crucial for deciphering the long-term global paleoclimate. Here we apply numerical modelling to reconstruct the detailed paleobathymetry-topography of the southwestern inlet of the Barents Seaway that presently connects the Atlantic and Arctic oceans. Subaerial topography was likely enough to block Atlantic Water from entering the Barents Seaway in the earliest Eocene (c. 55 Ma). The water may have entered in the middle Eocene (c. 47 Ma) as observed from major basin subsidence, but paleotopographic highs to the east may have hindered connections between the two oceans. From the Oligocene (c. 33 Ma) until the onset of the Quaternary (c. 2.7 Ma), basin shallowing and regional shelf uplift blocked Atlantic Water from entering the Barents Seaway. Our results imply that the Fram Strait remained the sole gateway for Atlantic Water into the Arctic Ocean since its opening in the Miocene until the Quaternary.
Publisher
Springer Science and Business Media LLC
Subject
General Earth and Planetary Sciences,General Environmental Science
Reference92 articles.
1. Straume, E. O., Gaina, C., Medvedev, S. & Nisancioglu, K. H. Global Cenozoic paleobathymetry with a focus on the Northern Hemisphere oceanic gateways. Gondwana Res. 86, 126–143 (2020).
2. Rossi, V. M., Longhitano, S. G., Olariu, C. & Chiocci, F. L. Straits and Seaways: end members within the continuous spectrum of the dynamic connection between basins. Geol. Soc. 523, 2022–2159 (2023).
3. Hutchinson, D. K. et al. Arctic closure as a trigger for Atlantic overturning at the Eocene-Oligocene transition. Nat. Commun. 10, 1–9 (2019).
4. Jakobsson, M. et al. The early Miocene onset of a ventilated circulation regime in the Arctic Ocean. Nature 447, 986–990 (2007).
5. GEBCO. GEBCO_2022 Grid. https://doi.org/10.5285/e0f0bb80-ab44-2739-e053-6c86abc0289c (2022).