An Improved Ammonia Inventory for the WRAP Domain ENVIRON International Corporation and University of California, Riverside WRAP Emission Forum Meeting.

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Presentation transcript:

An Improved Ammonia Inventory for the WRAP Domain ENVIRON International Corporation and University of California, Riverside WRAP Emission Forum Meeting July 15, 2004

Presents:/slides/gerry/nh3_conf ppt Introduction Objectives Methods and Data Sources GIS-based Model Development Summary

Presents:/slides/gerry/nh3_conf ppt Objectives Improved 2002 NH3 emission inventory for WRAP Consider major source categories Improved temporal/spatial allocation Incorporate environmental factors Develop GIS-based modeling system

Presents:/slides/gerry/nh3_conf ppt Methods and Data Sources Source categories Emission Factors Activity Data Temporal Allocation Spatial Allocation Environmental Data

Presents:/slides/gerry/nh3_conf ppt Source Categories Livestock – dairy & beef cows, poultry, swine, sheep, horses Fertilizer Usage Native Soils – urban, barren, forest, shrub/grassland, wetlands Domestic – Respiration, perspiration, infant diapers, cats, dogs

Presents:/slides/gerry/nh3_conf ppt Emission Factors Livestock – Battye, et al. – Chinkin, et al. – CMU NH3 Model – Others – Doorn, et al.; Keener, et al.; Pinder et al.; EEA

Presents:/slides/gerry/nh3_conf ppt Livestock Emission Factors (kg/head-year)

Presents:/slides/gerry/nh3_conf ppt Emission Factors Fertilizer Application – Battye, et al. – Chinkin, et al. – EEA – Potter, et al. Emission factors adjusted for soil pH (Potter, et al. 2001) – EF adj = EF * (0.3125pH – 1.01) – Normalized for 4% at pH=6.5

Presents:/slides/gerry/nh3_conf ppt Effect of Soil pH on Fertilizer Emissions

Presents:/slides/gerry/nh3_conf ppt Fertilizer Emission Factors (% N)

Presents:/slides/gerry/nh3_conf ppt Emission Factors Natural soils – source or sink Soil emission factors adjusted to account for soil conditions (Potter, et al., 2003) EF adj = EF * (1-M){1/[1+10 ( /T-c*pH) ]} – M = soil moisture – T = soil temp (K) – C = constant determines sensitivity to pH (=1.3)

Presents:/slides/gerry/nh3_conf ppt Native Soils Emission Factors (kg/km 2 -yr) DescriptionEmission FactorSource Urban10 Battye, et al. (2003) Chinkin, et al. (2003) Barren10 Forest174 - Deciduous 54 - Evergreen 114 – Mixed Shrub/Grassland400 Fallow205 Wetlands400

Presents:/slides/gerry/nh3_conf ppt Soil Emission Factor Adjustments

Presents:/slides/gerry/nh3_conf ppt Soil Emission Factor Adjustments

Presents:/slides/gerry/nh3_conf ppt Domestic Emission Factors (Chitjian et al, 2000) SourceEmission FactorsUnits Cats0.348lb N/cat/yr Dogs2.17lb N/dog/yr Human Respiration0.55lb/person/yr Human Perspiration0.0035lb/person/yr Cloth Diapers6.9lb/infant/yr Disposable Diapers0.36lb/infant/yr

Presents:/slides/gerry/nh3_conf ppt Activity Data Livestock headcounts – National Ag Services Statistics (NASS, 2003) Fertilized usage – Assoc. of American Plant Food Control Officers (AAPFCO, 2003); USDA; NASS Native soils – Land cover acreage (NLCD) Domestic – 2000 US Census; Pet per capita ratios from Dickson et al., 1991

Presents:/slides/gerry/nh3_conf ppt Temporal Allocation Livestock – Monthly profiles recommended by Chinkin et al. (2003) – Diurnal profiles based on Russell & Cass (1986) E i  [2.36 (Ti-273)/10 ] V i A E i = hourly emission rate A = daily total emission rate T i = hourly ambient air temperature (K) V i = hourly wind speed (m/s)

Presents:/slides/gerry/nh3_conf ppt Livestock Diurnal Profiles

Presents:/slides/gerry/nh3_conf ppt Livestock Diurnal Profiles

Presents:/slides/gerry/nh3_conf ppt Temporal Allocation Fertilizers – Monthly variation from fertilizer usage data – Diurnal profiles based on Russell & Cass (1986) Domestic Sources – Temporally invariant

Presents:/slides/gerry/nh3_conf ppt Temporal Allocation Native Soils – Temporal variation based on environmental parameters – EF adj = EF * (1-M){1/[1+10 ( /T-c*pH) ]} M = soil moisture T = soil temp (K) C = constant determines sensitivity to pH (=1.3)

Presents:/slides/gerry/nh3_conf ppt Spatial Allocation by Source Category Source CategorySpatial Surrogate LivestockLULC FertilizerAgricultural crop land SoilsLand use/Land cover DomesticPopulation

Presents:/slides/gerry/nh3_conf ppt Environmental Data Soil pH – STATSGO Soil Moisture – km MM5 modeling results Temperatures, wind speeds – km MM5 modeling results

Presents:/slides/gerry/nh3_conf ppt GIS-Based Emissions Model Development Designed to : – treat relationship of ammonia emissions to environmental variables (wind speed, temperatures, soil moisture & pH) – incorporate high resolution spatial data (LU/LC databases; population density; geo-coded point sources) – incorporate detailed source classification schemes Based on Arc/INFO GIS Flexible input data sources/formats; easily modified input tabular data (activity data, EF, spatial surrogate relationships) Modular & efficient processing capabilities Intuitive user interface

Presents:/slides/gerry/nh3_conf ppt Geospatial Data Land Use/Land Cover (LULC) – NLCD LU/LC coverages -- GIS rastor data; high spatial resolution (30 m); 21 LU/LC classifications for land use Soil pH – STATSGO - PSU Population – 2000 US Census data assembled by EPA

Presents:/slides/gerry/nh3_conf ppt GIS-based NH3 Emissions Model Main Menu

Presents:/slides/gerry/nh3_conf ppt GIS-based NH3 Emissions Model Emission Calculation Menu

Presents:/slides/gerry/nh3_conf ppt

Summary 2002 NH3 emission inventory for WRAP – Livestock, fertilizers, soils, domestic sources Updated emission factors, temporal allocation Incorporates environmental parameters – Temperature; soil moisture, pH; wind speed GIS-based NH3 emissions modeling system Final 2002 gridded inventory completed in late July