A Description of the Impact of Changes to NOGAPS Convection Parameterization and the Increase in Resolution to T239L30
NAVAL RESEARCH LAB MONTEREY CA
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The purpose of this report is to give a brief account of the recent changes to the Navy Operational Global Atmospheric Prediction System NOGAPS. These changes include 1 adding middle level convection Peng et al. 2002 and a simplified ice phase Emanuel, personal communication to the cumulus convection scheme, and 2 increasing the spectral resolution from 159 waves corresponding to a horizontal resolution of 0.75o to 239 waves corresponding to 0.5o resolution and increasing the number of vertical levels from 24 to 30, i.e. the resolution is increased from T159L24 to T239L30. The first change was transitioned in May 2002 and went operational into the T159L24 in June 2002. The second change T239L30 was transitioned in June 2002 and is scheduled for operational use in September 2002.