Slide 1

Galveston Bay Atmospheric Galveston Bay Atmospheric Deposition StudyDeposition Study

Anil K. KatamreddyCE 394K.3 GIS in Water Resources

Fall 2003University of Texas at Austin

Slide 2

Watershed Estuary Coastal Waters

Atmospheric DepositionAtmospheric Deposition

WetDeposition

DryDeposition

Indirect Input Direct Inputto water surface

WetDeposition

DryDeposition

Airshed Transport

Slide 3

Galveston BayGalveston Bay

Major Air pollution emission sources are located around this area

Slide 4

Wet Deposition Monitoring NetworkWet Deposition Monitoring Network

National Atmospheric National Atmospheric Deposition Program Deposition Program (NADP)(NADP)

Available Data Available Data • Annual and Seasonal Wet Annual and Seasonal Wet

Deposition flux rates Deposition flux rates (kg/ha/yr) of Ca, Mg, NO(kg/ha/yr) of Ca, Mg, NO33, , NHNH44, SO, SO44 ions and ions and Inorganic NitrogenInorganic Nitrogen

• Annual and Seasonal Annual and Seasonal Mean Concentrations Mean Concentrations (mg/L) of Ca, Mg, NO(mg/L) of Ca, Mg, NO33, , NHNH44, SO, SO44 ions ions

NADP Monitoring Network

Slide 5Spatial Interpolation: Kriging MethodSpatial 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

Trinity Bay

West Bay

Lower Galveston Bay

East Bay

Upper Galveston Bay

Legend

InorganicNitrogenWetDep.MEAN

3.904120

3.904121 - 3.957040

3.957041 - 3.962430

3.962431 - 4.000790

4.000791 - 4.011120

Inorganic Nitrogen Wet Deposition Flux from Nitrate and Ammonium (kg/ha/yr), 2000

Annual Inorganic Nitrogen Wet Annual Inorganic Nitrogen Wet Deposition Flux Deposition Flux

Slide 7

Slide 8

Annual Sulfate Ion Wet Deposition Flux Annual Sulfate Ion Wet Deposition Flux

!(

!(

Trinity Bay

West Bay

Lower Galveston Bay

East Bay

Upper Galveston Bay

Sulfate Ion Wet Deposition Flux (kg/ha/yr), 2000

Legend

galvestonbayGeo

SO4_WetDeposition_1.MEAN

13.973800

13.973801 - 14.313100

14.313101 - 14.364400

14.364401 - 14.508800

14.508801 - 14.550500

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

Trinity Bay

West Bay

Lower Galveston Bay

East Bay

Upper Galveston Bay

Inorganic Nitrogen Wet Deposition Flux, Winter 2000

Legend

galvestonbayGeo

InorganicN_Winter2000.MEAN

0.569999

0.570000 - 0.610093

0.610094 - 0.622538

0.622539 - 0.631536

0.631537 - 0.642217

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

Trinity Bay

West Bay

Lower Galveston Bay

East Bay

Upper Galveston Bay

Legend

InorganicN_Spring2000.MEAN

1.240240

1.240241 - 1.260430

1.260431 - 1.282740

1.282741 - 1.366260

1.366261 - 1.372230

Inorganic Nitrogen Wet Deposition Flux, Spring 2000

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

Trinity Bay

West Bay

Lower Galveston Bay

East Bay

Upper Galveston Bay

Legend

galvestonbayGeo

InorganicN_Summer2000.MEAN

0.874473

0.874474 - 0.900674

0.900675 - 0.911652

0.911653 - 0.922457

0.922458 - 0.942744

Inorganic Nitrogen Wet Deposition Flux, Summer 2000

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

Trinity Bay

West Bay

Lower Galveston Bay

East Bay

Upper Galveston Bay

Inorganic Nitrogen Wet Deposition Flux, Fall 2000

Legend

galvestonbayGeo

FallSeason_InorganicN.MEAN

1.006160

1.006161 - 1.007040

1.007041 - 1.031880

1.031881 - 1.067750

Slide 13 Future Work: Dry Deposition Flux Future Work: Dry Deposition Flux Rate CalculationsRate 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)

• Henry’s 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

43

44

33

4433

3

4

253

104

3

18

14

17

14

101

ln0768.0883.0

)1008.2*01988.000147.0(*085.01

298

116286exp1067.5

298

114092exp56

NHNHNNHx

NHairdpNH

NHeqairdgNH

NHNH

pHs

NHNH

xsNHeq

NH

NH

NH

NH

FFF

CvF

CCvF

KRTH

NHMC

S

SS

TK

TH

Slide 14

Dry Deposition Monitoring NetworkDry 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