Slide 1 Galveston Bay Atmospheric Deposition Study Anil K. Katamreddy CE 394K.3 GIS in Water Resources Fall 2003 University of Texas at Austin

Slide 2 Watershed EstuaryCoastal Waters Atmospheric Deposition Wet Deposition Dry Deposition Indirect Input Direct Input to water surface Wet Deposition Dry Deposition Airshed Transport

Slide 3 Galveston Bay Major Air pollution emission sources are located around this area

Slide 4 Wet Deposition Monitoring Network National Atmospheric Deposition Program (NADP)  Available Data Annual and Seasonal Wet Deposition flux rates (kg/ha/yr) of Ca, Mg, NO 3, NH 4, SO 4 ions and Inorganic Nitrogen Annual and Seasonal Wet Deposition flux rates (kg/ha/yr) of Ca, Mg, NO 3, NH 4, SO 4 ions and Inorganic Nitrogen Annual and Seasonal Mean Concentrations (mg/L) of Ca, Mg, NO 3, NH 4, SO 4 ions Annual and Seasonal Mean Concentrations (mg/L) of Ca, Mg, NO 3, NH 4, SO 4 ions NADP Monitoring Network

Slide 5 Spatial Interpolation: Kriging Method 1. Geostatistical Analyst: Kriging Prediction Map 2. Prediction Map Extent: Galveston Bay 4. Aggregated Prediction Map: Galveston Bay 3. Spatial Analyst: Zonal Statistics

Slide 6 Annual Inorganic Nitrogen Wet Deposition Flux

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Slide 8 Annual Sulfate Ion Wet Deposition Flux

Slide 9 Inorganic Nitrogen Wet Deposition Flux, Winter 2000

Slide 10 Inorganic Nitrogen Wet Deposition Flux, Spring 2000

Slide 11 Inorganic Nitrogen Wet Deposition Flux, Summer 2000

Slide 12 Inorganic Nitrogen Wet Deposition Flux, Fall 2000

Slide 13 Future Work: Dry Deposition Flux Rate Calculations NOAA inferential model : calculates the gas and particle dry deposition velocities (vdg, vdp) (Valigura, 1995) Deposition Flux Rate (F NHx ) calculations (Asman et. Al, 1994) Required Data : Ambient air concentrations (Cair) of ammonia and ammonium Ammonia equilibrium concentrations (Ceq) Henry’s Law constant (H NH3 ) has units of M atm-1, the ammonium disassociation constant (K NH4 ) has units of M, and salinity (S) has units of ppt

Slide 14 Dry Deposition Monitoring Network National Dry Deposition Network: 70 Monitoring Stations; Only 1 Station in TX Texas Commission on Environmental Quality (TCEQ): Monitoring Stations around Galveston Bay