NCEP Hawaii Experimental/Operational Run Air Quality Forecast Change Log

 

 CMAQ CB05/AERO-4  Hawaii Run Forecasts 

 

Date


Model Run

Change



October 18, 201112 UTC
  • The North American Model (NAM) was upgraded to the National Environmental Modeling System (NEMS) framework Non-hydrostatic Multi-scale Model (NMMB).  The NAM provides hourly meteorological predictions at 12 km to drive CMAQ.
May  17,2010

 Hawaii 18 UTC
  •  Correction to Aerosol Optical Thickness calculation in POST3 codes. This error created a memory leak that sometimes corrupted the AOT calculation.  This correction also impacts the Alaska Domain AOT outputs.
  • Daily Maximum Day 1 and Day 2 ozone GRIB2 NDGD files now available here
March 23, 2010 Hawaii 12 UTC
  • 48 hour forecasts at 06 and 12 UTC
  • 6 hour cycling at 18 and 00 UTC
  • 12 km CMAQ V4.6  Lambert Conformal native horizontal grid
  • Domain size: 80x52x22, Lambert Secant Conformal projection,
  • Corner points:
  • The CB05 chemical mechanism with more detailed Volatile Organic Compound (VOC) chemistry was implemented. 
  • A harmonized version of the AERO-4 aerosol chemistry mechanism was turned on. The harmonized NOx night time chemistry is configured with heterogeneous pathways turned off but gas-phase N205 hydrolysis turned on.  This was done to minimize the impact of aerosol chemistry on the ozone forecast.
  • Sea salt emissions were included in CMAQ.
  • Point, area and mobile emissions were upgraded based upon recent EPA National Emissions Inventory (NEI,  2005) and then projected for the current year.  Point EGU sources use 2007 CEM data.  These emissions are also consistent with the CB05 chemical mechanism.  More detailed Hawaii emission information is described by Daniel Tong, ARL, here.
  • Lateral Boundary Conditions:  Running with climatologically averaged ozone from the Hilo ozonesonde site with GEOS5-Chem global model climatological precurser species.
  • Post-processing upgraded for efficiency.  Now using cmaq2grib codes.  one and eight hour average ozone/PM produced.  Still awaiting daily maximum product generation.