EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

GEOS-MITgcm coupled atmosphere-ocean simulation for DYAMOND

Ehud Strobach1, Andrea Molod2, Atanas Trayanov2, William Putman2, Dimitris Menemenlis3, Patrice Klein3, Jean-Michel Campin4, Chris Hill4, and Chris Henze5
Ehud Strobach et al.
  • 1Agricultural Research Organization, Israel (
  • 2NASA Goddard Space Flight Center, United States
  • 3NASA Jet Propulsion Laboratory / Caltech, United States
  • 4Massachusetts Institute of Technology (MIT), United States
  • 5NASA Ames, United States

During the past few years, the Goddard Earth Observing System (GEOS) and Massachusetts Institute of Technology general circulation model (MITgcm) groups have produced, respectively, global atmosphere-only and ocean-only simulations with km-scale grid spacing. These simulations have proved invaluable for process studies and the development of satellite and in-situ sampling strategies. Nevertheless, a key limitation of these simulations is the lack of feedback between the ocean and the atmosphere, limiting their usefulness for studying air-sea interactions and designing observing missions to study these interactions. To remove this limitation, we have coupled the km-scale GEOS atmospheric model with the km-scale MITgcm ocean model. We will present preliminary results from the GEOS-MITgcm contribution to the second phase of the DYAMOND (DYnamics of the Atmospheric general circulation Modeled On Non-hydrostatic Domains) initiative.

The coupled atmosphere-ocean simulation was integrated using a cubed-sphere-1440 (~6-7 km horizontal grid spacing) configuration of GEOS and a lat-lon-cap-2160 (2–5-km horizontal grid spacing) configuration of MITgcm. We will show results from a preliminary analysis of air-sea interactions between Sea Surface Temperature (SST) and surface winds. In particular, we will discuss non-local atmospheric overturning circulation formed above the Gulf Stream SST front with characteristic sub-mesoscale width. This formation of a secondary circulation above the front suggests that capturing such air-sea interaction phenomena requires high-resolution capabilities in both the models' oceanic and atmospheric components.

How to cite: Strobach, E., Molod, A., Trayanov, A., Putman, W., Menemenlis, D., Klein, P., Campin, J.-M., Hill, C., and Henze, C.: GEOS-MITgcm coupled atmosphere-ocean simulation for DYAMOND, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14947,, 2021.