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

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

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

4. 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

5. 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

6. Slide 6 Annual Inorganic Nitrogen Wet Deposition Flux

7. Slide 7

8. Slide 8 Annual Sulfate Ion Wet Deposition Flux

9. Slide 9 Inorganic Nitrogen Wet Deposition Flux, Winter 2000

10. Slide 10 Inorganic Nitrogen Wet Deposition Flux, Spring 2000

11. Slide 11 Inorganic Nitrogen Wet Deposition Flux, Summer 2000

12. Slide 12 Inorganic Nitrogen Wet Deposition Flux, Fall 2000

13. 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

14. 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