Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-126
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
28 Feb 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Possibility for an infrared sounder as IASI to document the HCOOH chemistry in biomass burning plumes
Matthieu Pommier1,a, Cathy Clerbaux1,2, and Pierre-Francois Coheur2 1LATMOS/IPSL, UPMC Univ. Paris 06 Sorbonne Universités, UVSQ, CNRS, Paris, France
2Spectroscopie de l’Atmosphère, Chimie Quantique et Photophysique, Université Libre de Bruxelles (ULB), Brussels, Belgium
anow at: Norwegian Meteorological Institute, Oslo, Norway
Abstract. Formic acid (HCOOH) concentrations are often underestimated by models and its chemistry is highly uncertain. HCOOH is, however, among the most abundant atmospheric volatile organic compounds and it is potentially responsible for rain acidity in remote areas. HCOOH data from the Infrared Atmospheric Sounding Interferometer (IASI) are analyzed from 2008 to 2014, to estimate enhancement ratios from biomass burning emissions over seven regions. Fire-affected HCOOH and CO total columns are defined by combining total columns from IASI, geographic location of the fires from MODerate resolution Imaging Spectroradiometer (MODIS) and the surface wind speed field from the European Centre for Medium-Range Weather Forecasts (ECMWF). Robust correlations are found between these fire-affected HCOOH and CO total columns over the selected biomass burning regions, allowing the calculation of enhancement ratios equal to 7.30 × 10−3±0.08 × 10−3 mol/mol over Amazonia, 11.10 × 10−3±1.37 × 10−3 mol/mol over Australia, 6.80 × 10−3±0.44 × 10−3 mol/mol over India, 5.80 × 10−3±0.15 × 10−3 mol/mol over Southern East Asia, 4.00 × 10−3±0.19 × 10−3 mol/mol over Northern Africa, 5.00 × 10−3±0.13 × 10−3 mol/mol over Southern Africa, and 4.40 × 10−3±0.09 × 10−3 mol/mol over Siberia, in a fair agreement with previous studies. The comparison with other studies highlights a possible underestimation by 60 % of emission or a secondary production of HCOOH by Siberian forest fires while the studied fire plumes originating from Southern African savanna could suggest a limited secondary production of HCOOH or a limited sink. In comparison with data set characterizing emissions, it is also shown that the selected agricultural burning plumes captured by IASI over India and Southern East Asia correspond to recent plumes where the chemistry or the sink do not occur.

Citation: Pommier, M., Clerbaux, C., and Coheur, P.-F.: Possibility for an infrared sounder as IASI to document the HCOOH chemistry in biomass burning plumes, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-126, in review, 2017.
Matthieu Pommier et al.
Matthieu Pommier et al.
Matthieu Pommier et al.

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Short summary
A new estimation of enhancement ratio to CO for HCOOH over seven biomass burning regions is proposed. Fire-affected HCOOH and CO total columns are defined by combining total columns from IASI, geographic location of the fires from MODerate resolution Imaging Spectroradiometer (MODIS) and the surface wind speed field from the European Centre for Medium-Range Weather Forecasts (ECMWF). Australian and Siberian fires may be underestimated in terms of direct emission or secondary production of HCOOH.
A new estimation of enhancement ratio to CO for HCOOH over seven biomass burning regions is...
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