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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-276
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Sep 2018

Research article | 13 Sep 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Simultaneous observations by sky radiometer and MAX-DOAS for characterization of biomass burning plumes in central Thailand in January–April 2016

Hitoshi Irie1, Hossain Mohammed Syedul Hoque1, Alessandro Damiani1, Hiroshi Okamoto1, Al Mashroor Fatmi1, Pradeep Khatri2, Tamio Takamura1, and Thanawat Jarupongsakul3 Hitoshi Irie et al.
  • 1Center for Environmental Remote Sensing, Chiba University, 1-33 Yayoicho, Inage-ku, Chiba 263-8522, Japan
  • 2Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
  • 3Department of Geology, Faculty of Science, Chulalongkorn Un iversity, Phayathai Road, Bangkok 10330, Thailand

Abstract. The first intensive multi-component ground-based remote sensing observations by sky radiometer and Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) were performed simultaneously at the SKYNET/Phimai site located in central Thailand (15.18°N, 102.56°E) from January to April 2016. The period corresponds to the dry season associated with the intense biomass burning (BB) activity around the site. The near-surface concentration of formaldehyde (HCHO) retrieved from MAX-DOAS was found to be a useful tracer for BB plumes. As the HCHO concentration tripled from 3 to 9ppbv, the ratio of gaseous glyoxal to HCHO concentrations in daytime decreased from ~0.04 to ~0.03, responding presumably to the increased contribution of volatile organic carbon emissions from BB. In addition, clear increases in aerosol absorption optical depths (AAODs) retrieved from sky radiometer observations were seen with the HCHO enhancement. At a HCHO of 9ppbv, AAOD at a wavelength of 340nm reached as high as ~0.15±0.03. The wavelength dependence of AAODs at 340–870nm was quantified by the absorption Ångström exponent (AAE), providing evidence for the presence of brown carbon aerosols at an AAE of 1.5±0.2. Thus, our multi-component observations around central Thailand are expected to provide unique constraints for understanding physical/chemical/optical properties of BB plumes.

Hitoshi Irie et al.
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The first intensive multi-component observation by sky radiometer and MAX-DOAS was performed in Thailand during the 2016 dry season. We found that the concentration of formaldehyde (HCHO) was a useful tracer for biomass burning plumes. With the HCHO enhancement, the ratio of gaseous glyoxal to HCHO concentrations decreased and the aerosol absorption optical depths (AAODs) increased. The wavelength dependence of AAODs was quantified, providing evidence for the presence of brown carbon aerosols.
The first intensive multi-component observation by sky radiometer and MAX-DOAS was performed in...
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