Internal Dynamical Variability In The Nasa Ames Mars
General Circulation Models
A. F. C Bridger, Department Of Meteorology & Climate Science, San Jose State University, San Jose, Ca, Usa
(Alison.Bridger@Sjsu.Edu), M. A. Kahre, And R. J. Wilson, Nasa Ames Research Center, Moffett Field, Ca,
Usa.

Introduction: General Circulation Models
(Gcms) Have Been Used For Decades In Order To Understand And Predict How The Larger-Scale Motions
And Associated Structures And Phenomena Develop
And Behave. One Use Of Gcms Involves Varying External Forcings In Order To Understand The Atmosphere’S Sensitivity To Forcings. This Can Include
(Earth) Sea-Surface Temperatures Or Co2 Levels, And
(Mars) Dust Storms Or The Surface Albedo Field. Interpretation Of Results Depends On An Understanding Of
The Internal Variability Of The Gcm.
We Seek Here To Extend An Earlier Study [1] To
Characterize The Internal Variability Of The Nasaames Mgcm. There Are Two Incarnations Of This
Model: (A) The Legacy Model; And (B) The New Fv3based Version. The Legacy Model Has Been Under
Development For Decades And Is Now “Frozen”. It Was
Recently Released For General Use [3], [2]. The Newer
Fv3-Based Version Is Built Around The Finite-Volume
Dynamical Core Developed At Noaa/Gfdl. The Two