Vertical profiles of biospheric and fossil fuel-derived CO2 and fossil fuel CO2

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Author(s) Graven, Heather D., Stephens, Britton B., Guilderson, Thomas P., Campos, Teresa L., Schimel, David S., Campbell, J. Elliott, Keeling, Ralph F.
Publication Type Journal Items, Publication Status: Published
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Title Vertical profiles of biospheric and fossil fuel-derived CO2 and fossil fuel CO2
Subtitle CO ratios from airborne measurements of Δ14C, CO2 and CO above Colorado, USA
Author(s) Graven, Heather D.
Stephens, Britton B.
Guilderson, Thomas P.
Campos, Teresa L.
Schimel, David S.
Campbell, J. Elliott
Keeling, Ralph F.
Journal or Series Title Tellus. Series B, Chemical and physical meteorology
Volume Number 61
Issue Number 3
Start Page 536
End Page 546
ISSN 0280-6509
Publisher Wiley-Blackwell
Publication Place Copenhagen
Publication Date 2009-07-00
Abstract Measurements of Δ14C in atmospheric CO2 are an effective method of separating CO2 additions from fossil fuel and biospheric sources or sinks of CO2. We illustrate this technique with vertical profiles of CO2 and Δ14C analysed in whole air flask samples collected above Colorado, USA in May and July 2004. Comparison of lower tropospheric composition to cleaner air at higher altitudes (>5 km) revealed considerable additions from respiration in the morning in both urban and rural locations. Afternoon concentrations were mainly governed by fossil fuel emissions and boundary layer depth, also showing net biospheric CO2 uptake in some cases. We estimate local industrial CO2:CO emission ratios using in situ measurements of CO concentration. Ratios are found to vary by 100% and average 57 mole CO2:1 mole CO, higher than expected from emissions inventories. Uncertainty in CO2 from different sources was ±1.1 to ±4.1 ppm for addition or uptake of −4.6 to 55.8 ppm, limited by Δ14C measurement precision and uncertainty in background Δ14C and CO2 levels.
DOI 10.1111/j.1600-0889.2009.00421.x
Additional Notes Manuscript received 22 August 2008, In final form 3 March 2009, Published Online 5 Mar 2009
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 000017639
Source Database ID PP-50411
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  author = "Graven, Heather D. and Stephens, Britton B. and Guilderson, Thomas P. and Campos, Teresa L. and Schimel, David S. and Campbell, J. Elliott and Keeling, Ralph F.",
  title = "{V}ertical profiles of biospheric and fossil fuel-derived {C}{O}2 and fossil fuel {C}{O}2: {C}{O} ratios from airborne measurements of {Δ}14{C}, {C}{O}2 and {C}{O} above {C}olorado, {U}{S}{A}",
  journal = "Tellus. Series B, Chemical and physical meteorology",
  year = 2009,
  volume = "61",
  number = "3",
  pages = "536--546",
  month = jul,

E-Citations record created: Wed, 23 Jun 2010, 20:14:29 CET