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- W4387495846 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Record-breaking wildfires ravaged south-eastern Australia during the fire season 2019–2020. The intensity of the fires reached its paroxysmal phase at the turn of the year 2019–2020, when large pyro-cumulonimbi developed. Pyro-convective activity injected biomass burning aerosols and gases in the upper-troposphere—lower-stratosphere (UTLS), producing a long-lasting perturbation to the atmospheric composition and the stratospheric aerosol layer. The large absorptivity of the biomass burning plume produced self-lofting of the plume and thus modified its vertical dynamics and horizontal dispersion. Another effect of the in-plume absorption was the generation of compact smoke-charged anticyclonic vortices which ascended up to 35 km altitude due to diabatic heating. We use observational and modelling description of this event to isolate the dominant Southern-Hemispheric biomass burning aerosol plume from the main isolated vortex. Entering this information into an offline radiative transfer model, and with hypotheses on the absorptivity and the angular scattering properties of the aerosol layer, we estimate the radiative heating rates (HR) in the plume and the vortex. We found that the hemispheric-scale plume produced a HR of 0.08±0.05 K/d, which is strongly dependent on the assumptions on the aerosol optical properties and then on the plume ageing, in our simulations. We also found in-vortex HR as large as 15–20 K/d in the denser sections of the main vortex (8.4±6.1 K/d on average in the vortex). Our results suggest that radiatively-heated ascending isolated vortices are likely dominated by small-sized strongly absorbing black carbon particles. The hemispheric-scale and in-vortex HR estimates are consistent with the observed ensemble self-lofting (a few km in 4 months) and the main isolated vortex rise (~20 km in 2 months). Our results also put in evidence the importance of longwave emission in the net HR of biomass burning plumes." @default.
- W4387495846 created "2023-10-11" @default.
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- W4387495846 date "2023-10-10" @default.
- W4387495846 modified "2023-10-12" @default.
- W4387495846 title "Comment on egusphere-2023-1067" @default.
- W4387495846 doi "https://doi.org/10.5194/egusphere-2023-1067-ac1" @default.
- W4387495846 hasPublicationYear "2023" @default.
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