Aircraft-based measurements of the carbon footprint of Indianapolis

Kelly L. Mays, Paul B. Shepson, Brian H. Stirm, Anna Karion, Colm Sweeney, Kevin Gurney

Research output: Contribution to journalArticle

102 Citations (Scopus)

Abstract

The quantification of greenhouse gas emissions requires high precision measurements made with high spatial resolution. Here we describe measurements of carbon dioxide (CO2) and methane (CH4) conducted using Purdue University's Airborne Laboratory for Atmospheric Research (ALAR), aimed at the quantification of the "footprints" for these greenhouse gases for Indianapolis, IN. A cavity ring-down spectrometer measured atmospheric concentrations, and flask samples were obtained at various points for comparison. Coupled with pressure, temperature, and model-derived horizontal winds, these measurements allow for flux estimation. Long horizontal transects were flown perpendicular to the wind downwind of the city. Emissions were calculated using the wind speed and the difference between the concentration in the plume and the background concentration. A kriging method is applied to interpolate the measured values to a vertical plane traced out by the flight pattern within the mixed layer. Results show the urban plume is clearly distinguishable in the downwind concentrations for most flights. Additionally, there is large variability in the measured day-to-day emissions fluxes as well as in the relative CH4 and CO2 fluxes. Uncertainties in the method are discussed, and its potential utility in determining sector-based emission factors is shown.

Original languageEnglish (US)
Pages (from-to)7816-7823
Number of pages8
JournalEnvironmental Science and Technology
Volume43
Issue number20
DOIs
StatePublished - Oct 15 2009
Externally publishedYes

Fingerprint

Carbon footprint
carbon footprint
aircraft
Aircraft
Fluxes
Greenhouse gases
greenhouse gas
plume
flight
wind measurement
Methane
Gas emissions
kriging
Carbon Dioxide
footprint
mixed layer
Spectrometers
cavity
spatial resolution
spectrometer

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Mays, K. L., Shepson, P. B., Stirm, B. H., Karion, A., Sweeney, C., & Gurney, K. (2009). Aircraft-based measurements of the carbon footprint of Indianapolis. Environmental Science and Technology, 43(20), 7816-7823. https://doi.org/10.1021/es901326b

Aircraft-based measurements of the carbon footprint of Indianapolis. / Mays, Kelly L.; Shepson, Paul B.; Stirm, Brian H.; Karion, Anna; Sweeney, Colm; Gurney, Kevin.

In: Environmental Science and Technology, Vol. 43, No. 20, 15.10.2009, p. 7816-7823.

Research output: Contribution to journalArticle

Mays, KL, Shepson, PB, Stirm, BH, Karion, A, Sweeney, C & Gurney, K 2009, 'Aircraft-based measurements of the carbon footprint of Indianapolis', Environmental Science and Technology, vol. 43, no. 20, pp. 7816-7823. https://doi.org/10.1021/es901326b
Mays KL, Shepson PB, Stirm BH, Karion A, Sweeney C, Gurney K. Aircraft-based measurements of the carbon footprint of Indianapolis. Environmental Science and Technology. 2009 Oct 15;43(20):7816-7823. https://doi.org/10.1021/es901326b
Mays, Kelly L. ; Shepson, Paul B. ; Stirm, Brian H. ; Karion, Anna ; Sweeney, Colm ; Gurney, Kevin. / Aircraft-based measurements of the carbon footprint of Indianapolis. In: Environmental Science and Technology. 2009 ; Vol. 43, No. 20. pp. 7816-7823.
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