Direct and Indirect Measurements and Modeling of Methane Emissions in Indianapolis, Indiana

Brian K. Lamb, Maria O.L. Cambaliza, Kenneth James Davis, Steven L. Edburg, Thomas W. Ferrara, Cody Floerchinger, Alexie M.F. Heimburger, Scott Herndon, Thomas Claude Yves Lauvaux, Tegan Lavoie, David R. Lyon, Natasha Lynn Miles, Kuldeep R. Prasad, Scott James Richardson, Joseph Robert Roscioli, Olivia E. Salmon, Paul B. Shepson, Brian H. Stirm, James Whetstone

Research output: Contribution to journalArticle

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Abstract

This paper describes process-based estimation of CH4 emissions from sources in Indianapolis, IN and compares these with atmospheric inferences of whole city emissions. Emissions from the natural gas distribution system were estimated from measurements at metering and regulating stations and from pipeline leaks. Tracer methods and inverse plume modeling were used to estimate emissions from the major landfill and wastewater treatment plant. These direct source measurements informed the compilation of a methane emission inventory for the city equal to 29 Gg/yr (5% to 95% confidence limits, 15 to 54 Gg/yr). Emission estimates for the whole city based on an aircraft mass balance method and from inverse modeling of CH4 tower observations were 41 ± 12 Gg/yr and 81 ± 11 Gg/yr, respectively. Footprint modeling using 11 days of ethane/methane tower data indicated that landfills, wastewater treatment, wetlands, and other biological sources contribute 48% while natural gas usage and other fossil fuel sources contribute 52% of the city total. With the biogenic CH4 emissions omitted, the top-down estimates are 3.5-6.9 times the nonbiogenic city inventory. Mobile mapping of CH4 concentrations showed low level enhancement of CH4 throughout the city reflecting diffuse natural gas leakage and downstream usage as possible sources for the missing residual in the inventory.

Original languageEnglish (US)
Pages (from-to)8910-8917
Number of pages8
JournalEnvironmental Science and Technology
Volume50
Issue number16
DOIs
StatePublished - Aug 16 2016

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Methane
Natural gas
methane
Land fill
Wastewater treatment
Towers
modeling
natural gas
Ethane
Wetlands
Fossil fuels
landfill
Pipelines
Aircraft
biogenic emission
ethane
emission inventory
distribution system
footprint
fossil fuel

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Lamb, B. K., Cambaliza, M. O. L., Davis, K. J., Edburg, S. L., Ferrara, T. W., Floerchinger, C., ... Whetstone, J. (2016). Direct and Indirect Measurements and Modeling of Methane Emissions in Indianapolis, Indiana. Environmental Science and Technology, 50(16), 8910-8917. https://doi.org/10.1021/acs.est.6b01198
Lamb, Brian K. ; Cambaliza, Maria O.L. ; Davis, Kenneth James ; Edburg, Steven L. ; Ferrara, Thomas W. ; Floerchinger, Cody ; Heimburger, Alexie M.F. ; Herndon, Scott ; Lauvaux, Thomas Claude Yves ; Lavoie, Tegan ; Lyon, David R. ; Miles, Natasha Lynn ; Prasad, Kuldeep R. ; Richardson, Scott James ; Roscioli, Joseph Robert ; Salmon, Olivia E. ; Shepson, Paul B. ; Stirm, Brian H. ; Whetstone, James. / Direct and Indirect Measurements and Modeling of Methane Emissions in Indianapolis, Indiana. In: Environmental Science and Technology. 2016 ; Vol. 50, No. 16. pp. 8910-8917.
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abstract = "This paper describes process-based estimation of CH4 emissions from sources in Indianapolis, IN and compares these with atmospheric inferences of whole city emissions. Emissions from the natural gas distribution system were estimated from measurements at metering and regulating stations and from pipeline leaks. Tracer methods and inverse plume modeling were used to estimate emissions from the major landfill and wastewater treatment plant. These direct source measurements informed the compilation of a methane emission inventory for the city equal to 29 Gg/yr (5{\%} to 95{\%} confidence limits, 15 to 54 Gg/yr). Emission estimates for the whole city based on an aircraft mass balance method and from inverse modeling of CH4 tower observations were 41 ± 12 Gg/yr and 81 ± 11 Gg/yr, respectively. Footprint modeling using 11 days of ethane/methane tower data indicated that landfills, wastewater treatment, wetlands, and other biological sources contribute 48{\%} while natural gas usage and other fossil fuel sources contribute 52{\%} of the city total. With the biogenic CH4 emissions omitted, the top-down estimates are 3.5-6.9 times the nonbiogenic city inventory. Mobile mapping of CH4 concentrations showed low level enhancement of CH4 throughout the city reflecting diffuse natural gas leakage and downstream usage as possible sources for the missing residual in the inventory.",
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Lamb, BK, Cambaliza, MOL, Davis, KJ, Edburg, SL, Ferrara, TW, Floerchinger, C, Heimburger, AMF, Herndon, S, Lauvaux, TCY, Lavoie, T, Lyon, DR, Miles, NL, Prasad, KR, Richardson, SJ, Roscioli, JR, Salmon, OE, Shepson, PB, Stirm, BH & Whetstone, J 2016, 'Direct and Indirect Measurements and Modeling of Methane Emissions in Indianapolis, Indiana', Environmental Science and Technology, vol. 50, no. 16, pp. 8910-8917. https://doi.org/10.1021/acs.est.6b01198

Direct and Indirect Measurements and Modeling of Methane Emissions in Indianapolis, Indiana. / Lamb, Brian K.; Cambaliza, Maria O.L.; Davis, Kenneth James; Edburg, Steven L.; Ferrara, Thomas W.; Floerchinger, Cody; Heimburger, Alexie M.F.; Herndon, Scott; Lauvaux, Thomas Claude Yves; Lavoie, Tegan; Lyon, David R.; Miles, Natasha Lynn; Prasad, Kuldeep R.; Richardson, Scott James; Roscioli, Joseph Robert; Salmon, Olivia E.; Shepson, Paul B.; Stirm, Brian H.; Whetstone, James.

In: Environmental Science and Technology, Vol. 50, No. 16, 16.08.2016, p. 8910-8917.

Research output: Contribution to journalArticle

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AU - Lamb, Brian K.

AU - Cambaliza, Maria O.L.

AU - Davis, Kenneth James

AU - Edburg, Steven L.

AU - Ferrara, Thomas W.

AU - Floerchinger, Cody

AU - Heimburger, Alexie M.F.

AU - Herndon, Scott

AU - Lauvaux, Thomas Claude Yves

AU - Lavoie, Tegan

AU - Lyon, David R.

AU - Miles, Natasha Lynn

AU - Prasad, Kuldeep R.

AU - Richardson, Scott James

AU - Roscioli, Joseph Robert

AU - Salmon, Olivia E.

AU - Shepson, Paul B.

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AU - Whetstone, James

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AB - This paper describes process-based estimation of CH4 emissions from sources in Indianapolis, IN and compares these with atmospheric inferences of whole city emissions. Emissions from the natural gas distribution system were estimated from measurements at metering and regulating stations and from pipeline leaks. Tracer methods and inverse plume modeling were used to estimate emissions from the major landfill and wastewater treatment plant. These direct source measurements informed the compilation of a methane emission inventory for the city equal to 29 Gg/yr (5% to 95% confidence limits, 15 to 54 Gg/yr). Emission estimates for the whole city based on an aircraft mass balance method and from inverse modeling of CH4 tower observations were 41 ± 12 Gg/yr and 81 ± 11 Gg/yr, respectively. Footprint modeling using 11 days of ethane/methane tower data indicated that landfills, wastewater treatment, wetlands, and other biological sources contribute 48% while natural gas usage and other fossil fuel sources contribute 52% of the city total. With the biogenic CH4 emissions omitted, the top-down estimates are 3.5-6.9 times the nonbiogenic city inventory. Mobile mapping of CH4 concentrations showed low level enhancement of CH4 throughout the city reflecting diffuse natural gas leakage and downstream usage as possible sources for the missing residual in the inventory.

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