WRAP Regional Modeling Center WRAP RMC Windblown Dust

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 PM 10/PM 2. 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 MM 5 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

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 Pre 02 d Base 02 b 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 PM 10 WB Dust Emission Summary (tpy) 2002 Annual 12 -km Modeling Results

WRAP Regional Modeling Center 2002 Annual 12 -km Modeling Results

WRAP Regional Modeling Center

WRAP Regional Modeling Center 2002 Annual PM 10 WB Dust Emissions

WRAP Regional Modeling Center

WRAP Regional Modeling Center 2002 Monthly WB PM 10 Dust Emissions WRAP States

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)