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Slide 1 Galveston Bay Atmospheric Deposition Study Anil K. Katamreddy CE 394K.3 GIS in Water Resources Fall 2003 University of Texas at Austin
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Slide 2 Watershed EstuaryCoastal Waters Atmospheric Deposition Wet Deposition Dry Deposition Indirect Input Direct Input to water surface Wet Deposition Dry Deposition Airshed Transport
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Slide 3 Galveston Bay Major Air pollution emission sources are located around this area
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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
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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
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Slide 6 Annual Inorganic Nitrogen Wet Deposition Flux
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Slide 8 Annual Sulfate Ion Wet Deposition Flux
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Slide 9 Inorganic Nitrogen Wet Deposition Flux, Winter 2000
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Slide 10 Inorganic Nitrogen Wet Deposition Flux, Spring 2000
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Slide 11 Inorganic Nitrogen Wet Deposition Flux, Summer 2000
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Slide 12 Inorganic Nitrogen Wet Deposition Flux, Fall 2000
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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
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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
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