Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 18
Articles | Volume 26, issue 18
https://doi.org/10.5194/acp-26-13103-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-13103-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 18
Research article
 | 
17 Sep 2026
Research article |  | 17 Sep 2026

Evidence for the impact of fire activity on daily variations of IASI mid-tropospheric CO2 anomalies at 8–11 km over South America: a pyroconvective fingerprint

Victor Bon, Cyril Crevoisier, and Virginie Capelle

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Agustí-Panareda, A., Barré, J., Massart, S., Inness, A., Aben, I., Ades, M., Baier, B. C., Balsamo, G., Borsdorff, T., Bousserez, N., Boussetta, S., Buchwitz, M., Cantarello, L., Crevoisier, C., Engelen, R., Eskes, H., Flemming, J., Garrigues, S., Hasekamp, O., Huijnen, V., Jones, L., Kipling, Z., Langerock, B., McNorton, J., Meilhac, N., Noël, S., Parrington, M., Peuch, V.-H., Ramonet, M., Razinger, M., Reuter, M., Ribas, R., Suttie, M., Sweeney, C., Tarniewicz, J., and Wu, L.: Technical note: The CAMS greenhouse gas reanalysis from 2003 to 2020, Atmos. Chem. Phys., 23, 3829–3859, https://doi.org/10.5194/acp-23-3829-2023, 2023. 
Andela, N., Kaiser, J. W., van der Werf, G. R., and Wooster, M. J.: New fire diurnal cycle characterizations to improve fire radiative energy assessments made from MODIS observations, Atmos. Chem. Phys., 15, 8831–8846, https://doi.org/10.5194/acp-15-8831-2015, 2015. 
Andreae, M. O.: Emission of trace gases and aerosols from biomass burning – an updated assessment, Atmos. Chem. Phys., 19, 8523–8546, https://doi.org/10.5194/acp-19-8523-2019, 2019. 
Capelle, V., Chédin, A., Pondrom, M., Crevoisier, C., Armante, R., Crepeau, L., and Scott, N. A.: Infrared dust aerosol optical depth retrieved daily from IASI and comparison with AERONET over the period 2007–2016, Remote Sens. Environ., 206, 15–32, https://doi.org/10.1016/j.rse.2017.12.008, 2018. 
Chédin, A., Serrar, S., Scott, N. A., Pierangelo, C., and Ciais, P.: Impact of tropical biomass burning emissions on the diurnal cycle of upper tropospheric CO2 retrieved from NOAA 10 satellite observations, J. Geophys. Res.-Atmos., 110, 2004JD005540, https://doi.org/10.1029/2004JD005540, 2005. 
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To understand how fires influence climate, we need to understand the transport of their emissions. Using satellite observations, we detected day-to-day evolution of carbon dioxide high in the atmosphere (8–11 km) and traced the air back in time to identify fire sources. We showed that carbon dioxide and fire activity daily variability were strongly linked. Also, comparing observation data and a widely used modelling system showed model failed to reproduce the largest events.
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