modeling biomass burnings by coupling a sub-grid scale plume model with adaptive grid cmaq
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Modeling biomass burnings by coupling a sub-grid scale plume
model with Adaptive Grid CMAQ Aika Yano
Fernando Garcia-Menendez Yongtao Hu
M. Talat OdmanGary Achtemeier (USDA Forest Service)
D. Scott McRae (NC State)
9th Annual CMAS Conference11 October, 2010
sub-grid scale plume model: Daysmoke
Adaptive Grid - CMAQ
AG-CMAQ vs Daysmoke
+ Eularian + Unit in
concentration- Uniform conc in
grid cell+ Constant data pts to calculate
+ Lagrangian+ Unit in mass+ No emission
dilution- Varying data pts to be calculated
per time stepA
GD
-CM
AQ
Objective: combine the two models to obtain the most detailed conc. in a grid model
Adaptor
CMAQ
Daysmoke
MM5 (WRF)
ChemicalCoupling Ambient concentrationsParcel/Puff/Plume concentrations
Grid
Grid
Grid
Particles
GridSupport?
Distributions
Parcels mixed in grid cells
Meteorology
MeteorologyParticles/CCN
Handover
d = downwind distance
Emissions
ConcentrationsMeteorology
How to combine Daysmoke in AG-CMAQ?
New CMAQ setup
Inside driver Inside sciproc VDIFF
CMAQ DAYSMOKEXADVRest of
CMAQ codes
CMAQ_DAYSMOKE: Between VDIFF and COUPLE
• Calculate locations of 1kg PM2.5 parcels per Daysmoke time step
DAYSMOKE
• Convert Daysmoke emissions to concentrations
• Determine when and where Daysmoke results can be carried over to AG-CMAQ
HANDOVER • Convert parcels beyond the boundary into concentrations in Adaptive grid (for each species)
• update grid conc.
OutConcPlus
Handover
0
100000
200000
300000
400000
02000400060008000100001200014000160001800020000
con
c differen
ce (m
icrog
/m3)
downwind distance (meters)
sum of conc error vs. downwind distance
Handover
Remain in DaysmokeEmission added to grid concentration
Atlanta Smoke Case Feb. 28 2007
Oconee NF (1542 acres) 5 yr old
10:00 am - 3:00 pm total 5hr
Piedmont NWR (1460 acres) 1 yr old
11:00 am - 2:00 pm total 3hr
Atlanta Smoke Case Feb. 28 2007
Measurement Sites
CMAQ vs AGD-CMAQ
Model Comparison
Mean Normalized Error
0%
20%
40%
60%
80%
100%
120%
CMAQ
AG-CMAQ
AGD-CMAQ
Summary• Inputting PB smoke emissions into grid
concentrations can be varied in time and place using Handover method in AG-CMAQ coupled with Daysmoke (AGD-CMAQ) .
• On average, AGD-CMAQ has less error from the measured concentration than CMAQ and AG-CMAQ
• AGD-CMAQ seems to pick up the measured concentration peaks better
Adaptor
CMAQ
Daysmoke
MM5 (WRF)
ChemicalCoupling Ambient concentrationsParcel/Puff/Plume concentrations
Grid
Grid
Grid
Parcels
GridSupport?
Distributions
Parcels mixed in grid cells
Meteorology
MeteorologyParticles/CCN
Handover
d = downwind distance
Emissions
ConcentrationsMeteorology
Future work: changes in grid adaptation
Using Fourier Transform for grid adaptation
Thank youQuestions/Comments
Mean Normalized Error
0.00%
20.00%
40.00%
60.00%
80.00%
100.00%
120.00%
1. McDonough
2. South Dekalb
3. Confederate Ave.
4. Ft.McPherson
5. Jefferson St
6. Fire Station 8
CMAQ
AGD-CMAQ
AG-CMAQ
Fort McPherson
0
20
40
60
80
100
120
140
160
9:00 AM 12:00 PM 3:00 PM 6:00 PM 9:00 PM
Feb 28 2007 EST
PM
2.5
(m
g/m
3)
CMAQAGD-CMAQObservationsAG-CMAQ
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