[1] The interannual variations of tropical instability waves (TIWs) in the eastern Pacific Ocean and their relationships with ENSO intensity are studied using a 28-year long coupled atmosphere-ocean general circulation model (CGCM) simulation. The activity of TIWs is measured by the root-mean-square value of the 50-day high-pass filtered sea surface temperature (SST) perturbations produced in t...

[1] Mars Global Surveyor Accelerometer Experiment density measurements indicate the presence of planetary-scale wave structure in the Mars upper atmosphere ( 130 km). In particular, Phase 2 aerobraking observations reveal large amplitude zonal wave 2 and 3 variations in dayside density between ± 60 latitude. These spatial variations (in a fixed local solar time reference) can be qualitatively r...

Viking landers 1 and 2 measured the surface pressure on Mars for multiple annual cycles and found that Mars’ CO2 cycle is highly repeatable [1]. The dust cycle can affect the CO2 cycle by altering the heat balance of the atmosphere and by modifying the emissivity and albedo of the polar caps [2, 3]. One would therefore expect that the highly variable nature of the dust cycle would lead to year-...

R.M. Haberle, NASA/Ames Research Center ([email protected]), J.L Hollingsworth, NASA/Ames Research Center ([email protected]), A. Colaprete, NASA/Ames Research Center ([email protected]) A.F.C. Bridger, San Jose State University ([email protected]), C.P. McKay, NASA/Ames Research Center ([email protected]), J.R. Murphy, New Mexico State University (mur...

The multiple equilibria of the thermohaline circulation (THC: used here in the sense of the meridional overturning circulation) as function of the surface freshwater flux has been studied intensively following a Stommel paper from 1961. It is shown here that multistability and hysteresis of the THC also exist when the wind stress amplitude is varied as a control parameter. Both the Massachusett...

A parameterization of mesoscale eddies in coarse-resolution ocean general circulation models (GCM) is formulated and implemented using a residual-mean formalism. In that framework, mean buoyancy is advected by the residual velocity (the sum of the Eulerian and eddy-induced velocities) and modified by a residual flux which accounts for the diabatic effects of mesoscale eddies. The residual veloc...

Internal variability of stratiform clouds is manifested on grid scales ranging from cloud resolving models to general circulation models, and its accurate formulation is one of the most important tasks in improvement of model predictions. Understanding cloud variability on different scales will help develop and improve subgrid-scale cloud parameterizations. Information about variability is also...

In this paper, we set forth a 3-D ocean model of the radioactive trace isotopes Th and Pa. The interest arises from the fact that these isotopes are extensively used for investigating particle transport in the ocean and reconstructing past ocean circulation. The tracers are reversibly scavenged by biogenic and lithogenic particles. Our simulations of Th and Pa are based on the NEMO–PISCES ocean...

D. A. RANDALL, l R. D. CESS, 2 J.P. BLANCHET, 3 G. J. BOER, 3 D. A. DAZLICH, • A.D. DEL GENIO, 4 M. DEQUE, 5 V. DYMNIKOV, 6 V. GALIN, 6 S. J. GHAN, 7 A. A. LACIS, 4 H. LE TREUT, 8 Z.-X. LI, 8 X.-Z. LIANG, 9 B. J. MCAVANEY, •ø V. P. MELESHKO, TM J. F. B. MITCHELL, •2 J.-J. MORCRETTE, •3 G. L. POTTER, 7 L. RIKUS, lø E. ROECKNER, TM J. F. ROYER, 5 U. SCHLESE, TM D. m. SHEININ, TM J. SLINGO, 15 A. ...