Articles | Volume 17, issue 5
Research article
21 Oct 2021
Research article |  | 21 Oct 2021

Data-constrained assessment of ocean circulation changes since the middle Miocene in an Earth system model

Katherine A. Crichton, Andy Ridgwell, Daniel J. Lunt, Alex Farnsworth, and Paul N. Pearson

Model code and software

derpycode/cgenie.muffin: Crichton et al. [revised for CP] (v0.9.22) Andy Ridgwell, Chris Reinhard, Sebastiaan van de Velde, Markus Adloff, Fanny Monteiro, DomHu, Jamie Wilson, Ben Ward, Pam Vervoort, kirtlandster, and Mingsong Li

derpycode/muffindoc: (v0.9.20) A. Ridgwell, DomHu​​​​​​​, C. Peterson, B. Ward, sjszas​​​​​​​, evansmn, and R. Jones

Short summary
The middle Miocene (15 Ma) was a period of global warmth up to 8 °C warmer than present. We investigate changes in ocean circulation and heat distribution since the middle Miocene and the cooling to the present using the cGENIE Earth system model. We create seven time slices at ~2.5 Myr intervals, constrained with paleo-proxy data, showing a progressive reduction in atmospheric CO2 and a strengthening of the Atlantic Meridional Overturning Circulation.