Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010 Applying Fire Emission Inventories in Chemical Transport Models Zac Adelman

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Presentation transcript:

Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010 Applying Fire Emission Inventories in Chemical Transport Models Zac Adelman Center for Environmental Modeling For Policy Development University of North Carolina Institute for the Environment Developing a Technical Protocol to prepare Fire Emissions Inventories for Regional Air Quality Analysis and Planning Boise, ID August 31 – September 1, 2010

Outline Air quality modeling system overview Fire simulation and inventories State-of-the-science in fire emission modeling Recommendations Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010

Air Quality Modeling Systems Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010 Air Quality Modeling system components –Meteorology –Emissions –Chemistry-Transport –Data analysis/Visualization Model distribution portals –NCAR: emissions, meteorology, CTM, analysis –CMAS: emissions, CTM, analysis –U.S. EPA –Primary developers (e.g. ENVIRON for CAMx) EPA does not prescribe specific models or approaches

Emission Modeling Systems Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010 Convert pollutant inventories to the terms required for chemistry-transport models Inventory  CTM Annual/daily/hourlyHourly NOx, NMVOC, PM 2.5 NO, NO 2, HCHO, ETH, PEC, POC, etc. State/county/lat-lonGrid cell Release height (m)Layer (sigma-p)

Fire Simulation and Inventories Area Inventories: state/county totals, no release heights Point Inventories: lat-lon coordinates, “stack” parameters/release heights –WRAP FEJF Inventory: pre-computed plume parameters (LAY1F, PTOP, PBOT) –Blue Sky Inventory: heat flux/area burned Gridded Inventories: pre-defined data grid, cell totals, no release heights Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010

Fire simulation and Inventories Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010 Blue Sky Framework Fire Emissions Production Simulator (FEPS) –Remote sensed (AVHRR) fuel loads, either satellite (HMS) or manually added fire detects –Outputs point inventory with event locations and hourly WRAP FEJF plume parameters and emissions –CONSUME outputs heat flux, fuel loads, and acres burned National Emission Inventory (NEI) –County (area) inventories for ag and rx fires –CONSUME point inventories for large wildfires Global Fire Emissions Database (GFED) –Gridded 1° x 1° annual or 8-day average, global, MODIS-derived –No release height information

Fire Emissions Modeling Spatial allocation –Area inventory: Land cover Shapefile (forest, agricultural land, grass land) = spatial surrogate –Point: lat-lon mapped to grid cell by I/O API –Blue Sky disaggregates large fires into several smaller events, allowing hourly changes in fire location Chemical speciation –WRAP FEFJ PM 2.5 and SPECIATE NMVOC profiles Temporal allocation –Smaller fires (ag, rx) use regional generic seasonal profiles (annual  month) –Daily activity picked up by satellite detects –Blue Sky uses the Air Sciences hourly WF profile Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010

Fire Emissions Modeling Vertical allocation/plume rise –Compute plume top, plume bottom –Locate within air quality model layers, weighting by layer thickness –May include a smoldering fraction Vertical allocation (FEPS) –Plume top = 2 x Plume bottom Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010

Fire Emissions Modeling Vertical allocation (Briggs) –Briggs Plume Rise Algorithm Plume Rise (F<55) = H s x F 0.75 /U Plume Rise (F≥55) = H s x F 0.6 /U where, H s = stack height (m), F = bouyancy flux (m 4 /s 3 ), U = wind speed (m/s) –Conversion of heat flux to bouyancy flux F = Q x where, Q = heat flux (BTU/hr) –Heat flux calculation for fires Q = A x L x C x (2000lb/ton) x (1/D) where, A = acres burned (acres/day), L = fuel loading (tons/acre), C = heat content (BTU/lb), D = event duration (hr/day) Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010

Fire Emissions Modeling Vertical allocation (Briggs con’t) –Smoldering fraction BE = x ln(acres) S fract = 1 - BE where, BE = bouyancy efficiency Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010

Fire Emissions Modeling Vertical allocation (Air Sciences) Ptop hour = (BE hour ) 2 x (BE size ) 2 x Ptop potential Pbot hour = (BE hour ) 2 x (BE size ) 2 x Pbot potential Lay1F hour = 1 - (BE hour x BE size ) –Based on 5 fire size classes Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010 Class12345 PM 2.5 emissions (tons) Virtual Fire Size (acres)< ,0001,000-5,000>5,000 Frequency BE size Ptop potenial (m)1602,4006,4007,2008,000 Pbot potenial (m) ,600

Fire Emissions Modeling Vertical allocation comparison: 50 acre fire (top) and 500,000 acre fire (bottom) Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010 SMOKE/BriggsAir Sciences

Fire Emissions Modeling Vertical allocation results SB = SMOKE/Briggs, WF = Air Sciences Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010

Fire Emissions Modeling SMOKE summary –Area, point, and gridded inventories –Point fires with (a) heat flux, (b) fuel loads, acres burned, or (c) precomputed plume top, bottom, and smoldering fraction WRF-CMAQ summary –Area, point inventories –Point fires with (a) heat flux or (b) fuel loads, acres burned CAMx summary –Process 3-d emissions with SMOKE –Post processor to convert to low and elevated CAMx emissions files Fire Modeling Protocol MeetingBoise, IDAugust 31 – September 1, 2010

Recommendations Develop a general file format for emissions data (text, ncf, Shapefile?) Observational study of plume vertical profiles to validate plume rise algorithms Large fires –Use the ORL hourly point source format for emissions and plume parameters (supports in-line emissions in CMAQ) –Modify Lay1F implementation in SMOKE to represent a smoldering fraction in the entire boundary layer? Small fires –Use the SMOKE point source format for lat lon location, don’t need to include vertical profiles –Develop year-specific Shapefiles for fire locations if using the area source format Analysis: integrate remote sensing products (OMI AOD, CALIPSO vertical cross-sections) into fire modeling QA CMAS 4-09