H. M. Helfand

The effect of a gravity wave drag parameterization scheme on GLA fourth order GCM forecasts

Eugenia Kalnay, J. Pfaendtner, E. Kalnay, 1986 .

Design of a Nonsingular Level 2.5 Second-Order Closure Model for the Prediction of Atmospheric Turbulence

J. Labraga, H. Helfand, H. M. Helfand, 1988 .

The climatology of parameterized physical processes in the GEOS-1 GCM and their impact on the GEOS-1 data assimilation system

Andrea Molod, Lawrence L. Takacs, A. Molod, 1996 .