Evaluang updated light alkane emissions from the oil and ......Evaluang updated light alkane...
Transcript of Evaluang updated light alkane emissions from the oil and ......Evaluang updated light alkane...
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ZitelyTzompa-Sosa,B.Henderson,K.Travis,E.V.Fischer
Evalua8ngupdatedlightalkaneemissionsfromtheoilandnaturalgasindustryintheU.S.
Photocredit:www.beforethelastdrop.com
• AlkaneemissionsintheNEI2011ek(newestversion)arelargeroveroilandnaturalgasbasins.• Simula8onsofC2H6andC3H8underes8mateobserva8onsovertheCentralandSouthEasternU.S.• Theupdatedinventorywillbeusedtoassessimpactsonsecondaryspecies.
*SpecialthankstoAlanFried,DirkRichter,Pe>erWeibring,JamesWalega,&DonaldBlakeforprovidingobservaGonaldataforthiswork,andChristophA.KellerforhelpwithHEMCO.
September14th,2017
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Midwest NG Annual Gross Withdrawals
ManyregionsoftheU.S.haveseenanincreaseinoilandnaturalgasdevelopmentsince2000.
Francoetal.,2016
• Emissionratesareuncertain(nextslide)andrapidlychanging.
• Thesefactorspresentachallengeforemissioninventories.
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Totalemissionsfromthissector,andtheircomposi8on,dependonmanyfactors.
Spa8aldistribu8onofaveragedpercentagemolarC2H6/CH4ra8osinoilandnaturalgasbasinsoverthecon8guousU.S.
Emissionleakagedependson:• typeofoilandnaturalgasreservoir(e.g.,8ghtgasvsshalegas)• VOCcomposi8onofthenaturalgas• produc8onstageofthewell• Technologyandapplica8onofinsituemissioncontrols
Warnekeetal.,2014
Tzompa-Sosaetal.,2017
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ThelatestversionoftheNEI(2011v6.3)includesupdatesoveroilandgasbasins;weincorporateditintoGEOS-Chem.
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Hereisanexamplemapoftheseemissionsata0.5°x0.6°resolu8on.
C2H6anthropogenicemissions(ngm-2s-1)
NEI2011v1edBEFORE
NEI2011v6.3ekAFTER
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Theupdatedimplementa8on(NEI2011v6.3ekvs.v1ed)increasesalkaneemissionsoilandgasproducingregions.
ALK4
NEI2011v6.3ek–NEI2011v1edemissionfluxesat0.5°x0.6°resolu8on(ngm-2s-1)
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Rela8veemissionincreasesofC3H8andalkanes>C4arelargerthanC2H6intheupdatedinventory.
x 100(NEI 2011v6.3ek – NEI 2011v1ed) NEI 2011v1ed
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AnestedGEOS-Chemsimula8on(for2011)wascomparedtomul8pleobserva8onaldatasets.
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Anestedsimula8on(0.5°x0.6°)underes8matesC3H8abundancesovertheCentralandSouthEasternU.S.
• Underes8matesoverthesameregionsoccurforC2H6.
00.020.040.10.30.5246C3H8ppbv
• InGEOS-Chem,>C4alkanesarealumpedspeciescalledALK4.
• WhencomparedtothesumofC4andC5alkaneobserva8ons,themodelabundancesarehigher.
00.030.10.531050400ALK4&>C4
ppbC