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Trace gas emissions from savanna fires in northern Australia

Journal Article


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Abstract


  • We present analyses of near‐infrared ground‐based Fourier transform infrared solar

    absorption spectra recorded from a site in Darwin, Northern Territory, Australia

    (12.4°S, 130.9°E) from August 2005 to June 2008. Total column amounts of carbon

    monoxide derived from these spectra show a very clear annual cycle, with evidence of

    transported pollution from Indonesian fires in 2006. Aerosol optical depth measurements

    from the same site show a similar annual cycle but without exceptional values in 2006,

    suggesting significant loss of aerosol loading in the transported and aged smoke. In

    addition, we report the first ever measurements by remote sensing solar Fourier transform

    infrared of emission ratios with respect to carbon monoxide for formaldehyde

    (0.022 ± 0.007), acetylene (0.0024 ± 0.0003), ethane (0.0020 ± 0.0003), and hydrogen

    cyanide (0.0018 ± 0.0003) from Australian savanna fires. These are derived from

    mid‐infrared spectra recorded through smoke plumes over Darwin on 20 separate days.

    The only previous measurements of emission ratios for formaldehyde and hydrogen

    cyanide from Australian savanna fires involved cryogenic trapping and storage of samples

    that were gathered in very fresh smoke. The results reported here are nearly an order of

    magnitude higher (but in agreement with laboratory studies), suggesting losses in the

    collection, storage, or transfer of the gases in the earlier measurements and/or chemical

    production of these reactive gases within the smoke plumes. Emission ratios for acetylene

    and ethane from this work are in broad agreement with other literature values.

Publication Date


  • 2010

Citation


  • Paton-Walsh, C., Deutscher, N. M., Griffith, D. W., Forgan, B., Wilson, S. R., Jones, N. B. & Edwards, D. P. (2010). Trace gas emissions from savanna fires in northern Australia. Journal of Geophysical Research, 115 (D1), 1-32.

Scopus Eid


  • 2-s2.0-77956271721

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8474&context=scipapers

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5131

Has Global Citation Frequency


Number Of Pages


  • 31

Start Page


  • 1

End Page


  • 32

Volume


  • 115

Issue


  • D1

Abstract


  • We present analyses of near‐infrared ground‐based Fourier transform infrared solar

    absorption spectra recorded from a site in Darwin, Northern Territory, Australia

    (12.4°S, 130.9°E) from August 2005 to June 2008. Total column amounts of carbon

    monoxide derived from these spectra show a very clear annual cycle, with evidence of

    transported pollution from Indonesian fires in 2006. Aerosol optical depth measurements

    from the same site show a similar annual cycle but without exceptional values in 2006,

    suggesting significant loss of aerosol loading in the transported and aged smoke. In

    addition, we report the first ever measurements by remote sensing solar Fourier transform

    infrared of emission ratios with respect to carbon monoxide for formaldehyde

    (0.022 ± 0.007), acetylene (0.0024 ± 0.0003), ethane (0.0020 ± 0.0003), and hydrogen

    cyanide (0.0018 ± 0.0003) from Australian savanna fires. These are derived from

    mid‐infrared spectra recorded through smoke plumes over Darwin on 20 separate days.

    The only previous measurements of emission ratios for formaldehyde and hydrogen

    cyanide from Australian savanna fires involved cryogenic trapping and storage of samples

    that were gathered in very fresh smoke. The results reported here are nearly an order of

    magnitude higher (but in agreement with laboratory studies), suggesting losses in the

    collection, storage, or transfer of the gases in the earlier measurements and/or chemical

    production of these reactive gases within the smoke plumes. Emission ratios for acetylene

    and ethane from this work are in broad agreement with other literature values.

Publication Date


  • 2010

Citation


  • Paton-Walsh, C., Deutscher, N. M., Griffith, D. W., Forgan, B., Wilson, S. R., Jones, N. B. & Edwards, D. P. (2010). Trace gas emissions from savanna fires in northern Australia. Journal of Geophysical Research, 115 (D1), 1-32.

Scopus Eid


  • 2-s2.0-77956271721

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8474&context=scipapers

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/5131

Has Global Citation Frequency


Number Of Pages


  • 31

Start Page


  • 1

End Page


  • 32

Volume


  • 115

Issue


  • D1