NCEP Hawaii Experimental/Operational Run Air Quality Forecast Change
|October 18, 2011||12 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.
|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
- Daily Maximum Day 1 and Day 2 ozone GRIB2 NDGD files now
||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
- Domain size: 80x52x22, Lambert Secant Conformal projection,
- Corner points:
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.
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
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.