NCEP Developmental Run Air Quality Forecast Change Log


 O-CONUS Developmental Run Forecasts

 

Date

PM Model Run

Change
2009 Developmental Run Changes


ALASKA CMAQ RUN
September 2, 2009
 12 Z
  NAM-CMAQ Alaska CB05-AERO-4 Daily AQF 48 hour model predictions begun.
  • Domain size: 200x164x22, Lambert Secant Conformal projection,
  • Corner points:
    • SW:52.945;-166.534
    • SE: 52.945;-130.666
    • NW:69.377;-179.822
    • NE: 69.377;-117.378
       
  • 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 foreceast.
  • 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. EGU sources use 2007 CEM data projected for 2009.  These emissions are also consistent with the CB05 chemical mechanism.
  • Biogenic Sources are currently set to Alasks land-use type surrogates for Canadian part of domaing.
  • Lateral Boundary Conditions:  Running with static boundary conditions used for CONUS. Testing boundary conditions generated from  GEOS-5 -Chem global model


HAWAII CMAQ RUN
August 19, 2009
12Z NAM-CMAQ Hawaii CB05-AERO-4 Daily AQF 48 hour model predictions begun:
  • Domain size: 80x52x22, Lambert Secant Conformal projection,
  • Corner points:
    • SW:17.61;-162.080078
    • SE: 17.609863;-152.914551
    • NW:23.325584;-162.25
    • NE: 23.325447;-152.744284
       
  • 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 foreceast.
  • 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. EGU sources use 2007 CEM data projected for 2009.  These emissions are also consistent with the CB05 chemical mechanism.
  • Biogenic Sources are currently set to Florida land-use type surrogates.
  • Lateral Boundary Conditions:  Running with static boundary conditions used for CONUS. Testing boundary conditions generated from Hilo, HI ozonesonde climatology and GEOS-5 -Chem global model.