WRAP Regional Modeling Center

WRAP RMC Windblown Dust Emission Inventory

Project Summary

Dust Emission Joint Forum

6 June 2006

WRAP Regional Modeling Center

WRAP Fugitive Windblown Dust (WBD) Emissions Model

• PM dust emissions from wind erosion

• Relies on land use and soil characteristics in order to estimate threshold surface friction velocities and emission rates

• Special treatment for agricultural lands

• Current version of model uses updated landuse/landcover (2000 NLAC)

• Revised PM10/PM2.5 ratios

• Updated Transport Fractions (TFs)

• Project Final Report available from

www.pah.cert.ucr.edu/aqm/308/emissions.shtml or www.wrapair.org/

WRAP Regional Modeling Center

Data Sources

• Landuse/Landcover– 2000 North American Land Cover Database (2000 NALC)

• Soil Texture– STATSGO soils database (from Penn State)

• Meteorology– Penn State/NCAR MM5 model simulations– Annual 2002 36-km WRAP modeling domain

• Fugitive dust transport fractions from EPA (Pace, 2005)– Developed at grid-cell level based on 2000 NALC

WRAP Regional Modeling Center

• Landuse/Landcover (LULC)

WRAP Regional Modeling Center

Soil Texture Transport Fractions

WRAP Regional Modeling Center

LULC Summary

State Other Agricultural Grasslands Shrublands Barren Grand TotalArizona 18,758,664 219,547 3,134,865 44,041,477 4,292,737 70,447,290California 70,657,941 4,393,081 6,784,617 35,016,552 2,651,292 119,503,483Colorado 28,378,893 2,926,349 11,615,014 20,022,217 121,338 63,063,810Idaho 23,874,792 2,131,780 4,609,782 20,838,492 391,058 51,845,903Montana 23,090,186 5,453,456 25,847,871 35,794,753 170,443 90,356,709Nevada 8,413,608 209,584 2,246,357 56,934,277 1,209,823 69,013,649New Mexico 19,532,239 365,082 7,721,162 43,892,028 3,002,496 74,513,007North Dakota 2,231,768 27,031,363 11,413,970 3,733,372 170,799 44,581,271Oregon 29,960,558 1,273,161 2,618,555 26,092,683 427,352 60,372,310South Dakota 3,947,226 15,203,919 17,713,946 10,901,218 316,333 48,082,642Utah 4,633,623 536,236 9,246,251 34,461,812 3,668,967 52,546,889Washington 27,627,735 1,789,827 3,336,621 9,164,410 786,385 42,704,978Wyoming 6,127,043 650,102 41,469,891 11,428,559 550,825 60,226,419Total 267,234,276 62,183,486 147,758,903 352,321,849 17,759,848 847,258,361

Acreage by Landuse Category

WRAP Regional Modeling Center

Transport Fractions (Tom Pace, EPA, 6/2005)

• Effects of near-source dust removal & deposition

• Varies by LULC; Applied at grid-cell level (12-km)

LULC Category Pre02d Base02b

Urban 0.30 0.00

Agricultural 0.85 0.75

Grasslands 0.70 0.75

Shrublands 0.60 0.75

Forest 0.30 0.00

Barren/Water 0.97 1.00

WRAP Regional Modeling Center

PM10 WB Dust Emission Summary (tpy)2002 Annual 12-km Modeling Results

State Agricultural Grasslands Shrublands Barren TotalAZ 353 1,727 107,849 7,524 117,452CA 18,203 8,173 147,970 15,751 190,096CO 7,647 17,570 154,609 351 180,178ID 7,924 5,657 70,686 866 85,132MT 23,214 80,254 362,561 663 466,693NV 365 2,148 176,439 6,069 185,020NM 4,111 12,950 228,901 12,328 258,290ND 115,017 21,218 61,558 592 198,384OR 12,377 10,709 158,633 3,859 185,579SD 191,557 77,251 248,843 4,073 521,724UT 601 5,880 121,885 21,419 149,786WA 10,903 6,604 78,938 4,520 100,966WY 1,036 57,958 31,989 1,418 92,402WRAP Total 393,306 308,099 1,950,862 79,435 2,731,702

WRAP Regional Modeling Center

2002 Annual WB Dust PM10 Emissions

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2002 Annual 12-km Modeling Results

WRAP Regional Modeling Center

2002 Annual WRAP 36-km WB Dust2000 LULC (TFs Applied)

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WRAP Regional Modeling Center

2002 Annual PM10 WB Dust Emissions

WRAP Regional Modeling Center

WRAP Regional Modeling Center

2002 Monthly WB PM10 Dust EmissionsWRAP States

Monthly WB Dust PM10 Emission by Dust Category WRAP States

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WRAP Regional Modeling Center

Model Performance Evaluation

• Evaluate reasonableness of WBD Model results– Compare predicted PM dust emissions near IMPROVE monitors with

Observed fine soil and coarse mass

• Evaluate CMAQ model sensitivity to WB PM Dust emissions– Modified CMAQ simulations to track WB Dust emissions separately

– Review modeling results for fine soil and coarse mass

• Evaluate CMAQ model performance with and without WB Dust emissions– Investigate model performance at IMPROE monitors w/ and w/o WB

Dust emissions (time series and scatter plots)

WRAP Regional Modeling Center

Saguaro West, AZ, Coarse MassSAWE(CM vs pm10(-1,1))

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SAWE(CM vs pm10(-1,-1))

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WRAP Regional Modeling Center

Saguaro West, AZ, SoilSAWE(SOIL vs pm10(-1,1))

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WRAP Regional Modeling Center

Salt Creek, NM, Coarse MassSACR(CM vs pm10(-1,1))

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WRAP Regional Modeling Center

Salt Creek, NM, SoilSACR(SOIL vs pm10(-1,1))

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WRAP Regional Modeling Center

CMAQ Sensitivity Simulations

WRAP Regional Modeling Center

Model Performance Evaluation

Coarse MassFine Soil

WRAP Regional Modeling Center

Saguaro West, AZ

Fine Soil

Coarse Mass

WRAP Regional Modeling Center

Salt Creek, NMFine Soil

Coarse Mass

WRAP Regional Modeling Center

Badlands, NP

Glacier, NP

WRAP Regional Modeling Center

Grand Canyon, NP

San Gabriel