Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave...
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Transcript of Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave...
![Page 1: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/1.jpg)
Tribal Causes of Haze Representativeness Assessment
Phase IMark Green, Alissa Smiley, and Dave DuBois
Desert Research Institute
![Page 2: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/2.jpg)
Overview
• Goals: 1) determine whether each tribal area in the western US is “represented” by an IMPROVE monitor; 2) which IMPROVE monitors, if any, represent each tribal area
• Use physiographic regions to group sites in similar areas• Consider correlation coefficients by chemical species
between sites in each region and how they decay with distance to establish “representative distances”
• Fit correlation versus distance curves for each region with at least 4 sites
![Page 3: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/3.jpg)
Task 2WRAP tribal areas in blue and IMPROVE sites as yellow
dots
![Page 4: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/4.jpg)
COHA Physiographic Regions
![Page 5: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/5.jpg)
Zone of Representation• For each major component (sulfate, nitrate, OC, EC, fine
soil, CM) plot correlation versus distance between sites- define zone of representation as distance where correlation coefficient falls to 0.7
• r=0.7 somewhat arbitrary, but gives r2 of 0.49, so about one-half of variance at that distance can be explained by variation at IMPROVE site
• This gives a regionally representative distance for each aerosol component
• Each aerosol distance was then weighted by its contribution to light extinction on worst visibility days
• Weighted distances summed over all aerosol species to create a regional representative distance
![Page 6: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/6.jpg)
Example fitted curve for sulfate, Cascade Region
OC
Cascade Range Region y = 0.9079e-0.0012x
R2 = 0.90
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Cascade Range Regiony = 0.8632e -0.0021x
R2 = 0.72
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Distance (km)
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![Page 7: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/7.jpg)
Zone of Representation
• Cascade Range region exampleAverage sulfate extinction on 20% worst days= 15.57 Mm-1
Rep. Distance = 94 + 0 + 34 + 5 + 6 + 0 = 139 km
Sulfate contributed 37% to worst case extinction
Sulfate distance when r2 = 0.7
![Page 8: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/8.jpg)
Zone of Representation
• Regional ZoR ranged from 91 km in Colorado Plateau to 210 km in Northern Great Plains
• For those regions with less than 4 aerosol monitoring sites, we used a regional ZoR of 150 km
• For each region, we calculated the distance from each tribe to each IMPROVE site
• If the distance to the nearest IMPROVE site was greater than the regional ZoR, then we colored the area red
• Portions of many tribes outside of regional ZoR• Total of 11 tribes entirely outside of regional ZoR
![Page 9: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/9.jpg)
Example: Central Rocky Mountains Region
• Red dots denote IMPROVE sites
• Blue circles-140 km aerosol zone of influence
• Purple circles around non-represented tribal area (Uintah & Ouray)
• 17 Class I Areas
![Page 10: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/10.jpg)
11 Tribes totally outside of ZoR
![Page 11: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/11.jpg)
Monitoring Recommendations
• For those 11 tribes not represented we did a regional scale examination to determine if a new aerosol sampling site is warranted
• We determined that 6 new monitoring sites would satisfy our criteria– Spirit Lake, ND– Sisseton-Wahpeton Sioux, ND/SD– NW Band of Shoshoni Nation, north of Salt Lake City– Pueblo of Acoma, NM– Quechuan and Cocopah near Yuma, AZ– Northern NV and SE Oregon
![Page 12: Tribal Causes of Haze Representativeness Assessment Phase I Mark Green, Alissa Smiley, and Dave DuBois Desert Research Institute.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e4d5503460f94b43c76/html5/thumbnails/12.jpg)
Tribal representative analysis Phase 1 summary
• Method gives a representative distance based on objective criteria that weights importance of each chemical compound to light extinction
• Representative distances ranged from 91-210 km
• All but 11 tribal areas had representative IMPROVE monitors
• Several regions had fewer that 4 IMPROVE monitors and were assigned representative disance of 150 km
• Did not include effects of intervening terrain or emission sources (phase 2 did)