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8/14/2019 SARP Presentation JEN
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OverviewOverview
IntroductionBackground
Where/how the samples were
collectedMethodology
Comparing the three datasets
Coefficient of VariationResults
Conclusion
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IntroductionIntroduction
Airborne sample collection 1000 feet and below
Ground grid study
Comparison between data Confirmation
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BackgroundBackgroundThere were three
separate samplecollections
A first flight on July 22nd
A second flight on July
24th
Grid was predetermined by
Melissa Yang, Ph.D.o Roughly 25 miles between
centers of each boxo Designed to match up with
previous grid studieso All samples taken away
from possible sources(roads, tractors, etc.)
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BackgroundBackground
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MethodologyMethodology
Samples wereanalyzed in theRowland/Blake Labusing gaschromotography
Two systems wereutilized: the bigsystem and themethane system
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MethodologyMethodology
Data filtered 1500 feet
Data was included where the three
sampling campaigns overlappedIntroduction of error
Data from the dairy and vineyardwere discarded
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Actual Data
Used
All datacollectedduringSARP 2009
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MethodologyMethodology
Correlation Average concentrations
Coefficient was too high
Dominating concentrations
Needed a different way to look at howthe data varied
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MethodologyMethodology
Made the decision to compare theconcentrations separately
Calculated standard deviations from
average concentrations Standard deviation inaccurate
Used the coefficient of variationinstead
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Results: Coefficients ofResults: Coefficients of
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CCl4All Data
Flight
Flight
Grid
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PropeneAll Data Flight
Flight Grid
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ResultsResults
Of all thegases, 9 havea coefficient
of variationgreater than.4
Shorterlifetimes
Seinfeld, John. "Global Atmospheric Chemistry of ReactiveHydrocarbons." Reactive hydrocarbons in the atmosphere. Ed. C. N.
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Further WorkFurther Work
Attempt to compare datasets thatoverlay better (though this isdifficult when dealing with
airplanes)Do a comparison between
datasets that is more specificgeographically or temporally
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Questions?Questions?
Thank you!
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