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Current estimates of biogenic emissions from eucalypts uncertain for southeast Australia

Journal Article


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Abstract


  • The biogenic emissions of isoprene and monoterpenes are one of the main drivers of atmospheric photochemistry, including oxidant and secondary organic aerosol production. In this paper, the emission rates of isoprene and monoterpenes from Australian vegetation are investigated for the first time using the Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGANv2.1); the CSIRO chemical transport model; and atmospheric observations of isoprene, monoterpenes and isoprene oxidation products (methacrolein and methyl vinyl ketone). Observations from four field campaigns during three different seasons are used, covering urban, coastal suburban and inland forest areas. The observed concentrations of isoprene and monoterpenes were of a broadly similar magnitude, which may indicate that southeast Australia holds an unusual position where neither chemical species dominates. The model results overestimate the observed atmospheric concentrations of isoprene (up to a factor of 6) and underestimate the monoterpene concentrations (up to a factor of 4). This may occur because the emission rates currently used in MEGANv2.1 for Australia are drawn mainly from young eucalypt trees (< 7 years), which may emit more isoprene than adult trees. There is no single increase/decrease factor for the emissions which suits all seasons and conditions studied. There is a need for further field measurements of in situ isoprene and monoterpene emission fluxes in Australia.

Authors


  •   Emmerson, Kathryn M. (external author)
  •   Galbally, Ian E.
  •   Guenther, Alex B. (external author)
  •   Clare Murphy (Paton-Walsh)
  •   Guerette, Elise-Andree
  •   Cope, Martin (external author)
  •   Keywood, Melita (external author)
  •   Lawson, Sarah J. (external author)
  •   Molloy, Suzie B. (external author)
  •   Dunne, Erin (external author)
  •   Thatcher, Marcus (external author)
  •   Karl, Thomas (external author)
  •   Maleknia, Simin D. (external author)

Publication Date


  • 2016

Citation


  • Emmerson, K. M., Galbally, I. E., Guenther, A. B., Paton-Walsh, C., Guerette, E., Cope, M. E., Keywood, M. D., Lawson, S. J., Molloy, S. B., Dunne, E., Thatcher, M., Karl, T. & Maleknia, S. D. (2016). Current estimates of biogenic emissions from eucalypts uncertain for southeast Australia. Atmospheric Chemistry and Physics, 16 (11), 6997-7011.

Scopus Eid


  • 2-s2.0-84973922618

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4915&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3892

Has Global Citation Frequency


Number Of Pages


  • 14

Start Page


  • 6997

End Page


  • 7011

Volume


  • 16

Issue


  • 11

Place Of Publication


  • Germany

Abstract


  • The biogenic emissions of isoprene and monoterpenes are one of the main drivers of atmospheric photochemistry, including oxidant and secondary organic aerosol production. In this paper, the emission rates of isoprene and monoterpenes from Australian vegetation are investigated for the first time using the Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGANv2.1); the CSIRO chemical transport model; and atmospheric observations of isoprene, monoterpenes and isoprene oxidation products (methacrolein and methyl vinyl ketone). Observations from four field campaigns during three different seasons are used, covering urban, coastal suburban and inland forest areas. The observed concentrations of isoprene and monoterpenes were of a broadly similar magnitude, which may indicate that southeast Australia holds an unusual position where neither chemical species dominates. The model results overestimate the observed atmospheric concentrations of isoprene (up to a factor of 6) and underestimate the monoterpene concentrations (up to a factor of 4). This may occur because the emission rates currently used in MEGANv2.1 for Australia are drawn mainly from young eucalypt trees (< 7 years), which may emit more isoprene than adult trees. There is no single increase/decrease factor for the emissions which suits all seasons and conditions studied. There is a need for further field measurements of in situ isoprene and monoterpene emission fluxes in Australia.

Authors


  •   Emmerson, Kathryn M. (external author)
  •   Galbally, Ian E.
  •   Guenther, Alex B. (external author)
  •   Clare Murphy (Paton-Walsh)
  •   Guerette, Elise-Andree
  •   Cope, Martin (external author)
  •   Keywood, Melita (external author)
  •   Lawson, Sarah J. (external author)
  •   Molloy, Suzie B. (external author)
  •   Dunne, Erin (external author)
  •   Thatcher, Marcus (external author)
  •   Karl, Thomas (external author)
  •   Maleknia, Simin D. (external author)

Publication Date


  • 2016

Citation


  • Emmerson, K. M., Galbally, I. E., Guenther, A. B., Paton-Walsh, C., Guerette, E., Cope, M. E., Keywood, M. D., Lawson, S. J., Molloy, S. B., Dunne, E., Thatcher, M., Karl, T. & Maleknia, S. D. (2016). Current estimates of biogenic emissions from eucalypts uncertain for southeast Australia. Atmospheric Chemistry and Physics, 16 (11), 6997-7011.

Scopus Eid


  • 2-s2.0-84973922618

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4915&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3892

Has Global Citation Frequency


Number Of Pages


  • 14

Start Page


  • 6997

End Page


  • 7011

Volume


  • 16

Issue


  • 11

Place Of Publication


  • Germany