cerully presentation without year to year

8/14/2019 Cerully Presentation Without Year to Year

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KateCerullyPhDPreCandidate

GeorgiaInstitute

of

Technology


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1)Backgroundand

Motivation2)CaseStudyy Objectives

y

Methodologyy Results

y Limitations

4)Conclusions

and

Recommendations


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Background

AndMotivation


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y Morethan6millionpeople

y 18counties

y Morethan2/5ofCAslandarea

y 450miles

in

length

y 40to60mileswide

y SanJoaquinValley(SJV)is

thought

to

be

the

most

productiveagriculturalregionintheU.S.

Photo:2004MatthewTrump


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y RankedfirstinU.S.milkproductionin2006

y

SJV

is

home

to

about

2.5+

millioncattle

y InAugust2005,theSJVAirPollutionControlDistrictissued

areport

identifying

dairiesasamainsourceofvolatileorganic

compounds

(VOCs)

and

fineparticulatematterinthevalley

JustaglimpseofHarrisRanch,thelargestmeatlotwestoftheMississippiRiver!


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FreeStallsExercisePens

SilagePiles

FoodStorageTreatmentLagoon


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SilagePiles


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y SJVclassifiedbytheU.S.EPAasaseriousnonattainmentareafortheeighthourfederalozonestandard

VOCs

NO


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Oxygenate MIR(gO3/gC) LifetimeEthanol 1.69 4

days

Methanol 0.71 16days

Acetone 0.43 16days

Acetaldehyde 6.84 11hours

y OxygenatesplayanimportantroleinO3 formationwithinthevalley

MIRvalues:Carter(1998)Lifetimes:SeinfeldandPandis (1998)


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CaseStudy


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Compareethanol,methanol,andmethane

concentrations

from

aircraft,

dairy

perimeter,

and

grid

samplesinordertoinvestigatethefollowing:

1)Are

dairy

farm

silage

piles

greatly

influencing

concentrationsseenthroughoutthevalley?

2)How

do

the

perimeter

samples

compare

with

thegriddata?


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PerimeterStudy:July23,2009

GridStudy:

July24,

2009


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Flight1:July22,2009

Flight2:July

24,

2009


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y SampleswereanalyzedusinggaschromatographyintheRowlandBlakeLaby Flame

Ionization

Detector

y ElectronCapture

y MassSpectrometer


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4.26 5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50 9.00 9.50 10.00 10.50 11.00 11.40

4.67

6.00

7.00

8.00

9.00

10.00

11.00

12.00

13.00

14.45

1 - SARPSOURCE #2 [modified by Melissa Yang, 7 peaks manually assigned] BF7990 Int_Chan_5

2 - SARPSOURCE #9 [modified by Melissa Yang, 3 peaks manually assigned] BF6201A Int_Chan_5mV

min

211*-

Propene

(B)-

4.5

11

2*-

Propane

(B)-

4.6

57

3*-

CH3Cl(B)-

5.9

76

4*-ace

talde

hy

de

(B)-

7.6

96

5*-n-Bu

tane

(B)-

7.7

39

6*-

Me

thano

l(B)-

8.6

95

7*-

Ethano

l(B)-

9.8

63

8*-ace

tone

(B)-

10

.070

9*-

Isoprene

(B)-

10

.482

10-

10

.553

11-

10

.624

12*-

2,2

-Dime

thy

lbu

tane

(B)-1

1.1

25

FigureCourtesyofMelissaYang


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0

2000

4000

6000

8000

10000

12000

14000

1.600 1.700 1.800 1.900 2.000 2.100 2.200

M

ethanolCon

centration(pptv)

MethaneConcentration(ppmv)

AirplaneSampleTakenUnder1500ft

UpwindGridSample

DownwindGridSample


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y Surroundingareacontainsmany

dairies(all

of

whichcaninfluence

peripheral

cans)y Winddirection

andspeeds

variable

y Noteveryfarm

hassilagepiles


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y SilagepilesarecontributingoxygenatestotheCentral

ValleyAir

Basin

y

Methanol

and

ethanol

concentrations

taken

from

dairyperimetersamplesareconsistentwithconcentrationsseenwithintheboundarylayery

Perimeter

Samples

on

high

end

of

concentrations

y Gridstudyshowsthatemissionsevenhigherthanour

casestudy

dairy

exist


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y Locateamoresecludedfarmforfuturestudies

y Carefullydocumentwinddirectionanddurationy

Samples

may

need

to

be

obtained

on

a

different

day

y Comparesamplestakenaroundfarmswithand

withoutsilage


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y MelissaYang,Dr.DonBlake,Dr.Sherwood

Rowlandand

the

rest

of

theRowlandBlakeResearchGroup

y UCI

y NSERC

y NASA

y FellowSARPStudents

y Nenes ResearchGroup

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