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Flux estimates of isoprene, methanol and acetone from airborne PTR-MS measurements over the tropical rainforest during the GABRIEL 2005 campaign

Journal Article


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Abstract


  • Tropical forests are a strong source of biogenic volatile organic compounds (BVOCs) to the atmosphere which can potentially impact the atmospheric oxidation capacity. Here we present airborne and ground-based BVOC measurements representative for the long dry season covering a large area of the northern Amazonian rainforest (6–3° N, 50–59° W). The measurements were conducted during the October 2005 GABRIEL (Guyanas Atmosphere-Biosphere exchange and Radicals Intensive Experiment with the Learjet) campaign. The vertical (35 m to 10 km) and diurnal (09:00–16:00) profiles of isoprene, its oxidation products methacrolein and methyl vinyl ketone and methanol and acetone, measured by PTR-MS (Proton Transfer Reaction Mass Spectrometry), have been used to empirically estimate their emission fluxes from the forest canopy on a regional scale. The mixed layer isoprene emission flux, inferred from the airborne measurements above 300 m, is 5.7 mg isoprene m−2 h−1 after compensating for chemistry and ~6.9 mg isoprene m−2 h−1 taking detrainment into account. This surface flux is in general agreement with previous tropical forest studies. Inferred methanol and acetone emission fluxes are 0.5 mg methanol m−2 h−1 and 0.35 mg acetone m−2 h−1, respectively. The BVOC measurements were compared with fluxes and mixing ratios simulated with a single-column chemistry and climate model (SCM). The inferred isoprene flux is substantially smaller than that simulated with an implementation of a commonly applied BVOC emission algorithm in the SCM.

UOW Authors


  •   Lelieveld, J (external author)
  •   Williams, Jonathan (external author)
  •   Eerdekens, G (external author)
  •   Sinha, V (external author)
  •   Yassaa, N (external author)
  •   Vila-Guerau de Arellano, J (external author)
  •   Ganzeveld, L (external author)
  •   Klupfel, T (external author)
  •   Martinez, M (external author)
  •   Harder, H (external author)
  •   Kubistin, Dagmar C.

Publication Date


  • 2009

Citation


  • Eerdekens, G., Ganzeveld, L., Vila-Guerau de Arellano, J., Klupfel, T., Sinha, V., Yassaa, N., Williams, J., Harder, H., Kubistin, D., Martinez, M. & Lelieveld, J. (2009). Flux estimates of isoprene, methanol and acetone from airborne PTR-MS measurements over the tropical rainforest during the GABRIEL 2005 campaign. Atmospheric Chemistry and Physics, 9 (13), 4207-4227.

Scopus Eid


  • 2-s2.0-70450279502

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2845&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/1827

Has Global Citation Frequency


Number Of Pages


  • 20

Start Page


  • 4207

End Page


  • 4227

Volume


  • 9

Issue


  • 13

Abstract


  • Tropical forests are a strong source of biogenic volatile organic compounds (BVOCs) to the atmosphere which can potentially impact the atmospheric oxidation capacity. Here we present airborne and ground-based BVOC measurements representative for the long dry season covering a large area of the northern Amazonian rainforest (6–3° N, 50–59° W). The measurements were conducted during the October 2005 GABRIEL (Guyanas Atmosphere-Biosphere exchange and Radicals Intensive Experiment with the Learjet) campaign. The vertical (35 m to 10 km) and diurnal (09:00–16:00) profiles of isoprene, its oxidation products methacrolein and methyl vinyl ketone and methanol and acetone, measured by PTR-MS (Proton Transfer Reaction Mass Spectrometry), have been used to empirically estimate their emission fluxes from the forest canopy on a regional scale. The mixed layer isoprene emission flux, inferred from the airborne measurements above 300 m, is 5.7 mg isoprene m−2 h−1 after compensating for chemistry and ~6.9 mg isoprene m−2 h−1 taking detrainment into account. This surface flux is in general agreement with previous tropical forest studies. Inferred methanol and acetone emission fluxes are 0.5 mg methanol m−2 h−1 and 0.35 mg acetone m−2 h−1, respectively. The BVOC measurements were compared with fluxes and mixing ratios simulated with a single-column chemistry and climate model (SCM). The inferred isoprene flux is substantially smaller than that simulated with an implementation of a commonly applied BVOC emission algorithm in the SCM.

UOW Authors


  •   Lelieveld, J (external author)
  •   Williams, Jonathan (external author)
  •   Eerdekens, G (external author)
  •   Sinha, V (external author)
  •   Yassaa, N (external author)
  •   Vila-Guerau de Arellano, J (external author)
  •   Ganzeveld, L (external author)
  •   Klupfel, T (external author)
  •   Martinez, M (external author)
  •   Harder, H (external author)
  •   Kubistin, Dagmar C.

Publication Date


  • 2009

Citation


  • Eerdekens, G., Ganzeveld, L., Vila-Guerau de Arellano, J., Klupfel, T., Sinha, V., Yassaa, N., Williams, J., Harder, H., Kubistin, D., Martinez, M. & Lelieveld, J. (2009). Flux estimates of isoprene, methanol and acetone from airborne PTR-MS measurements over the tropical rainforest during the GABRIEL 2005 campaign. Atmospheric Chemistry and Physics, 9 (13), 4207-4227.

Scopus Eid


  • 2-s2.0-70450279502

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2845&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/1827

Has Global Citation Frequency


Number Of Pages


  • 20

Start Page


  • 4207

End Page


  • 4227

Volume


  • 9

Issue


  • 13