Proposed Changes to WRF-NMM Model

• Improved computation of surface longwave radiation

  • remove averaging of tendencies from two lowest layers
  • upward LW at sfc computed based on skin temp instead of average of skin T and lowest model layer T

• Bug fix for climatological values of stratospheric O3

• August 2007 version of WRF-NMM repository code with modified array indexing (~5% speedup vs current ops code); compiled with higher optimization for further speedup (Thanks to J. Abeles and C. Pasti of IBM)