Preprints
https://doi.org/10.5194/acp-2022-447
https://doi.org/10.5194/acp-2022-447
 
27 Jul 2022
27 Jul 2022
Status: this preprint is currently under review for the journal ACP.

Estimation of Biomass Burning Emission of NO2 and CO from 2019–2020 Australia Fires Based on Satellite Observations

Nenghan Wan1, Xiaozhen Xiong2, Gerard Klutenberg1, J. M. Shawn Hutchinson3, Robert Aiken1, Haidong Zhao1, and Xiaomao Lin1 Nenghan Wan et al.
  • 1Department of Agronomy, Kansas Climate Center, Kansas State University, Manhattan, KS, 66502, USA
  • 2NASA Langley Research Center, Hampton, VA, 23618, USA
  • 3Department of Geography and Geospatial Sciences, Kansas State University, Manhattan, KS, 66502, USA

Abstract. The bushfires that occurred in Australia in late 2019 and early 2020 were unprecedented in terms of their scale, intensity, and impacts. Using nitrogen dioxide (NO2) and carbon monoxide (CO) data measured by the Tropospheric Monitoring Instrument (TROPOMI), together with fire counts and fire radiative power (FRP) from MODIS, we analyzed the temporal and spatial variation of NO2 and CO column densities over three selected areas covering savanna and temperate forest vegetation. The ΔNO2 / ΔCO emission ratio and emission factor were also estimated. The ΔNO2 / ΔCO emission ratio was found to be 1.5 ± 1.2 for temperate forest fire and ranged from 2 ± 1.3 to 2.8 ± 1.8 for savanna fire. For savanna and temperate forest fires, satellite-derived NOx emission factors are 1.29 g kg-1 and 1.2 g kg-1 separately, while CO emission factors are 62.34 and 112.5 g kg-1. This study demonstrates that the large-scale emission ratio from the TROPOMI satellite for different biomass burnings can help identify the relative contribution of smoldering and flaming activities and their impacts on the regional atmospheric composition and air quality.

Nenghan Wan et al.

Status: open (until 07 Sep 2022)

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Nenghan Wan et al.

Nenghan Wan et al.

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Short summary
This study used new TROPOMI measurements of NO2 and CO to characterize the regional biomass burning characteristics and efficiency. We found the NO2 / CO emission ratio was consistent with recent studies over temperate forest fires but slightly lower in savanna vegetation fires. Our results can help identify the relative contribution of smoldering and flaming activities and their impacts on the regional atmospheric composition and air quality.
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