NCEP Operational Air Quality Forecast Change Log
Date |
Model
Run |
Change |
2011-2012 Changes | ||
June 1, 2012 | 12 UTC |
|
October 18, 2011 | 12 UTC |
|
June 1, 2011 | 12 UTC |
|
2009-2010 Changes | ||
July 6, 2010 |
12 UTC |
|
September 30, 2010 |
12 UTC |
|
May 1, 2010 |
12 UTC |
|
August 12,
2009 |
12 UTC |
|
May 01, 2009 | 12 Z |
|
2008 Changes | ||
December 16, 2008 | 12Z | Changes
to the NAM driving meteorological model forecast system:
|
May 13, 2008 | 12Z Run |
|
March 31, 2008 | 12Z Run | Changes to the NAM
WRF-NMM weather forecast model implemented. Impact on AQ
specific weather and ozone predictions are shown here.
|
September 18, 2007 | 12Z run | Experimental CONUS
CMAQ gas-phase only forecast system moved to NCO Operational slot:
|
Eastern U.S. Operational Run Change Log (2005-Sept. 2007) |
||
July 3, 2007 | 12Z Run | CMAQ Point source emission files updated with 2007 projections. |
May 16, 2007 | 00Z Run | CMAQ static area emissions updated with 2007 projections. |
September 5, 2006 | 12Z Run | CMAQ now driven by updates to NAM model (additional NAM-Y changes implemented) that include increase to horizontal diffusion and corrections to SST initial conditions. |
August 22, 2006 | 18Z Run | CRISIS Fix: PREMAQ array bounds corrections implemented. Very small improvement in ozone predictions. |
August 15, 2006 | 12 Z Run | CMAQ now driven by NAM-Y meteorology which was implemented into NAM slot. NAM-Y had corrections to vertical and horizontal diffusion and lake SST initialization which resulted in more realistic warmer,dryer boundary layers that increase production of ozone. The NAM-Y impact on CMAQ forecasts can be seen from Tsidulko analysis. |
August 01, 2006 | 12Z Run | CRISIS Fix: Some Point Source Emissions were still configured for 2005 . These emissions files were updated for 2006 projections. |
July 28, 2006 | 18Z Run | CRISIS FIX: The WRF post code interpolates WRF outputs from the WRF hybrid vertical coordinate systems to CMAQ sigma levels and uses simple interpolation for all elements except temperature. For temperature, to be consistent with hydrostatic balance, it first computes geopotential heights for upper and lower boundaries (using the hydrostatic equation) and then computes temperature at desired sigma level using the hydrostatic equation again. This algorithm doesn't work in the first model layer, and in this case temperature is extrapolated from the upper layers. In case of an inversion, since the algorithm involves several upper layers, the bottom sigma temperature happens to be higher then the first model layer temperature. To fix the problem for loose coupling,. temperature is simply interpolated (just like all other elements) for the lowest model layer, while using hydrostatically derived temperature for all the upper layers. Impact of these changes can be seen here. |
June 20, 2006 | 12Z Run | Operational CMAQ Eastern U.S.
ozone run driven by operational NAM-WRF. 12 km CMAQ gas w/ reduced CB4 gas phase chemistry forecasts run twice/day(06 and 12Z) to 48 hours. WRF outputs interpolated to CMAQ sigma verfical coordinate for loose vertical coupling.
|
April 4, 2006 |
18 Z cycle |
Eastern U.S. (3X) run
initiated with NAM-WRF parallel run. WRF outputs interpolated to
CMAQ sigma verfical coordinate for loose vertical coupling for 6 hour
cycling. Operational CMAQ NAM-Eta and NAM-WRF 3X domain runs are viewed
here |
August 31, 2005 |
00 Z
cycle |
NE operational forecasts
replaced with Eastern U.S. (3X) Experimental runs. Click here for more info on Eastern U.S. configuration The 3X operational forecasts were the same as the NE U.S. runs except:
|
N.E. U.S. Operational Run Change Log
(2004-2005) |
||
June 10, 2005 |
00 Z Run |
A bug was corrected in the
interpolation of ozone from the new GFS T382 to the CMAQ 12 km
grid. This has helped reduce ozone overpredictions found in runs
from May 31-June 10, 2005. |
May 31, 2005 |
12 Z GFS Upgrade |
The NCEP Global
Forecast System (GFS) was upgraded to T382 (~35 km). In addition, the following implementations were changed:
|
May 3, 2005 |
12 Z NAM-12 CMAQ
Operational (1X domain) |
Upgraded NAM-12.
Upgraded CMAQ : PREMAQ updated to use NAM-12 1 km landuse data Minor CMAQ updates to version 4.4 2002 Point/Area Source Emissions projected for 2005 Updated Mobile 6 source emissions GFS ozone for CMAQ LBCs above 6 km |
2004 |
||
September 15, 2004 |
00 Z |
N.E. U.S. Run declared
operational |
May 1, 2004 |
12 Z Eta-12 CMAQ Experimental |
Implemented Experimental System 2002 Point/Area Source Emissions Projected for 2004 Updated Mobile 6 mobile source emissions 6 hour initial condition cycling Use of GFS ozone predictions for CMAQ upper Lateral Boundary Conditions March 2004 Eta-12 implementation 48 hour forecasts for both 06 and 12 UTC runs |
May 5, 2004 |
12 Z Experimental |
Correction to 6 hour Cycling system. Now turned on. |
May 17, 2004 |
12 Z Experimental |
Correction to GFS ozone LBC ingest. Now working. |
May 26, 2004 |
12z Experimental |
Sfc ozone Grib files now available on /com/aqm/prod |
July 20,
2004 |
06z
|
1.
Limited GFS LBC ozone ingest to above 6 km AGL (CMAQ sigma
lvl 18) |
Date |
System
Component |
Change |
June 1, 2005 |
Grid2obs VSDB records |
VSDB exceedence records
(FHO) now being produced for daily maximum 1 and 8 hour ozone
predictions. |
March 25, 2005 |
Grid2obs VSDB |
VSDB file generation
turned on for 2005 Ozone season: Backward averaged convention used for both Airnow bufr and cmaq forecasts L1L2 and FHO statistics now computed (except daily maximums) |
2004 FVS VSDB File changes |
||
May 31, 2004 |
Grid2obs VSDB records |
VSDB
records (L1,L2) begun for NE domain on 146 grid using forward averaged
BUFR observations |
June
9-June 20 |
BUFR
generation |
BUFR
software changed at EPA to produce backward averages. VSDB records not produced |
June
21, 2004 |
BUFR
Generation |
BUFR
softward changed at EPA to produce foreward averages for NCO data tanks. Bufr tanks and VSDB records for June 9-20 recreated with foreward avging |
July
12, 2004 |
VSDB
records |
VSDB
records are now computed for East US domain on Grid 146, 142 Subdomain records computed for all grids (eg: NEC, SEC,APL...) |
July 22,
2004 |
3X VSDB
Records |
VSDB
records computed for developmental 3x domain (Grid 142) over full
domain, and subregions, and over 1 x domain |
August 1, 2004 | VSDB records | VSDB subdomains updated to new
FVS regions. MDW, GMC and LMV now replace NMW, SMW (midwest) subregions. |
August 1, 2004 |
FHO VSDB records |
Began creating 1h & 8
h VSDB FHO records
for events : 1hr ozone > 20, 40, 65, 85, 105, 125 ppb 8h avg ozone > 20, 40, 65, 85 ppb |
Date |
Model
Run |
Change |
June 25, 2003 |
12 Z Eta-12 – CMAQ Experimental |
Implemented Experimental System with 24 hour ozone initialization cycling. Used Spring 2003 Eta-12 implementation |
July 23-24 |
12 Z Experimental |
CMAQ Archives lost |
July 31- August 4 |
12 Z Experimental |
Cold Start Runs…No cycling |
August 5 |
12 Z NCO run |
Transfer to NCO Cold Start…no cycling |
August 5 |
06Z Experimental |
06Z implemented 6 hour cycling (6z only) |
August 15 |
06 Z Experimental |
Cold Start |
August 20 |
06 Z NCO 12 Z NCO |
Transfer of 6 hour cycling to NCO for 6 and 12 Z runs. Cold Start |
September 9 |
06 Z, 12 Z NCO |
Eta-Post: landuse, soiltype variable packing fixed. Previously landuse values incorrectly packed to equal 0 (Ocean) or 10. |