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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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Atmospheric Deposition
Indirect Input
Direct Input to water surface
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Galveston Bay
Major Air pollution emission sources are located
around this area
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Wet Deposition Monitoring Network

• National Atmospheric Deposition Program (NADP)
• Available Data
• Annual and Seasonal Wet Deposition flux rates
  (kg/ha/yr) of Ca, Mg, NO3, NH4, SO4 ions and
  Inorganic Nitrogen
• Annual and Seasonal Mean Concentrations (mg/L) of
  Ca, Mg, NO3, NH4, SO4 ions

NADP Monitoring Network
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Spatial Interpolation Kriging Method
3. Spatial Analyst Zonal Statistics
1. Geostatistical Analyst Kriging Prediction Map
4. Aggregated Prediction Map Galveston Bay
2. Prediction Map Extent Galveston Bay
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Annual Inorganic Nitrogen Wet Deposition Flux
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(No Transcript)
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Annual Sulfate Ion Wet Deposition Flux
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Inorganic Nitrogen Wet Deposition Flux, Winter
2000
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Inorganic Nitrogen Wet Deposition Flux, Spring
2000
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Inorganic Nitrogen Wet Deposition Flux, Summer
2000
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Inorganic Nitrogen Wet Deposition Flux, Fall 2000
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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 (FNHx) calculations (Asman
  et. Al, 1994)
• Required Data
• Ambient air concentrations (Cair) of ammonia and
  ammonium
• Ammonia equilibrium concentrations (Ceq)
• Henrys Law constant (HNH3) has units of M atm-1,
  the ammonium disassociation constant (KNH4) has
  units of M, and salinity (S) has units of ppt

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