Gateway-driven weakening of ocean gyres leads to Southern Ocean cooling

• Other Authors: IMAS Data Manager (publisher), Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) (hasAssociationWith), Joanne Whittaker (hasPrincipalInvestigator), Klocker, Andreas (collaborator), Sauermilch, Isabel (pointOfContact), Sauermilch, Isabel (hasPrincipalInvestigator), Whittaker, Jo (hasPrincipalInvestigator), Whittaker, Joanne (hasPrincipalInvestigator), Whittaker, Joanne, Assoc/Prof (hasPrincipalInvestigator), Whittaker, Joanne, Dr (hasPrincipalInvestigator)
• Format: Dataset
• Language: unknown
• Published: University of Tasmania, Australia
• Subjects: oceans; Southern Ocean; ACC; Cenozoic Greenhouse-Icehouse Transition; Sea Surface Temperatures; Ocean Gyres; Antarctic cooling; Eocene-Oligocene transition; Tectonic gateways; EARTH SCIENCE | CLIMATE INDICATORS | PALEOCLIMATE INDICATORS | PALEOCLIMATE RECONSTRUCTIONS | SEDIMENTS; EARTH SCIENCE | CLIMATE INDICATORS | PALEOCLIMATE INDICATORS; EARTH SCIENCE | CLIMATE INDICATORS | PALEOCLIMATE INDICATORS | PALEOCLIMATE RECONSTRUCTIONS; EARTH SCIENCE | CLIMATE INDICATORS | PALEOCLIMATE INDICATORS | PALEOCLIMATE RECONSTRUCTIONS | SEA SURFACE TEMPERATURE RECONSTRUCTION; EARTH SCIENCE | CLIMATE INDICATORS | PALEOCLIMATE INDICATORS | PALEOCLIMATE RECONSTRUCTIONS | STREAMFLOW RECONSTRUCTION; EARTH SCIENCE | CLIMATE INDICATORS | PALEOCLIMATE INDICATORS | PLATE TECTONICS; EARTH SCIENCE | PALEOCLIMATE | OCEAN/LAKE RECORDS | MICROFOSSILS; EARTH SCIENCE | PALEOCLIMATE | OCEAN/LAKE RECORDS | ISOTOPES; EARTH SCIENCE | OCEANS | MARINE GEOPHYSICS; Physical Oceanography; EARTH SCIENCES; OCEANOGRAPHY; Antarctic; Antarc*; Sea ice
• Online Access: https://doi.org/10.25959/5eb21fc078c99; https://researchdata.edu.au/gateway-driven-weakening-ocean-cooling/1726620

Maintenance and Update Frequency: notPlanned Statement: The ocean model used is the MIT general circulation model (MITgcm, version MITgcmUV checkpoint62x) in an ocean-only configuration with no sea ice. The model domain is circumpolar and extends between 84°S and 25°S (and 0°, see model run in SI) in latitude. The horizontal grid spacing is 0.25°, equivalent to a zonal grid spacing of ~27.8 km and a meridional grid spacing of ~3 km to ~25 km at the southern and northern boundary, respectively. The model configuration uses 50 vertical levels, ranging from 10 m at the sea surface to 368 m at the bottom. Our model uses a linear drag coefficient of 0.0011, a nonlinear equation of state, a seventh-order advection scheme for temperature and salinity and the K-profile parameterization. No parameterization is used for the advection and diffusion due to mesoscale eddies. Partial cells are used in the vertical for a more accurate representation of bathymetry. Restoring boundary conditions for the surface forcing are taken from a coupled atmosphere-ocean model (GFDL CM2.1) simulating Late Eocene conditions with atmospheric CO2 concentrations of 800 ppm. The surface forcing for sea surface temperature, sea surface salinity, and zonal and meridional wind stresses are temporally and zonally averaged values from the coupled model (Figure S1). The surface forcing is zonal averaged, in order to be able to modify the bathymetry configurations and continent-ocean distributions, without causing artificial disturbances of the ocean circulations. A sponge layer of ~300 km is used at the northern boundary of the model to relax to a temporal and zonal mean of salinity and temperature output from the coupled model with a restoring time scale of 10 days. Credit This research was undertaken with support from Australian Research Council Special Research Initiative for Antarctic Gateway Partnership (Project ID SR140300001), Discovery Project 180102280, and computational resources from the Australian National Computational ...