All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 203 35 5
PDF Downloads 73 37 2

Sensitivity of the Eddy Momentum Flux to Meridional Resolution in Atmospheric GCMs

Isaac M. HeldGeophysical Fluid Dynamics Laboratory/N0AA, Princeton University, Princeton, New Jersey

Search for other papers by Isaac M. Held in
Current site
Google Scholar
PubMed
Close
and
Peter J. PhillippsGeophysical Fluid Dynamics Laboratory/N0AA, Princeton University, Princeton, New Jersey

Search for other papers by Peter J. Phillipps in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

GCM experiments with zonally symmetric climates are used to demonstrate that the increase in the meridional eddy momentum fluxes and zonal surface winds that occurs when resolution is increased is primarily due to the increase in meridional rather than zonal resolution. It is argued that the sensitivity to meridional resolution reflects the need to resolve the small scales generated in the Rossby wave field as waves radiate from the midlatitude baroclinic eddy source region into regions with small mean winds. Some additional experiments highlight the sensitivity of surface winds and eddy momentum fluxes to the subgrid-scale horizontal mixing formulation in low-revolution models.

Abstract

GCM experiments with zonally symmetric climates are used to demonstrate that the increase in the meridional eddy momentum fluxes and zonal surface winds that occurs when resolution is increased is primarily due to the increase in meridional rather than zonal resolution. It is argued that the sensitivity to meridional resolution reflects the need to resolve the small scales generated in the Rossby wave field as waves radiate from the midlatitude baroclinic eddy source region into regions with small mean winds. Some additional experiments highlight the sensitivity of surface winds and eddy momentum fluxes to the subgrid-scale horizontal mixing formulation in low-revolution models.

Save