Fig. 3: Perturbation of the stratospheric aerosol optical depth (SAOD) due to Australian fires and the strongest events since 1991. | Communications Earth & Environment

Fig. 3: Perturbation of the stratospheric aerosol optical depth (SAOD) due to Australian fires and the strongest events since 1991.

From: The 2019/20 Australian wildfires generated a persistent smoke-charged vortex rising up to 35 km altitude

Fig. 3

The curves represent the SAOD perturbation at 746 nm following the Australian wildfires, the previous record-breaking Canadian wildfires in 2017 and the strongest volcanic eruptions in the last 29 years (eruptions of Calbuco volcano in 2015 and Raikoke volcano in 2019 [ref. 41]). The time series are computed from OMPS-LP aerosol extinction profiles as weekly-mean departures of aerosol optical depth above 380 K isentropic level (see Fig. 2) from the levels on the week preceding the event. The weekly averages are computed over equivalent-area latitude bands (as indicated in the panel) roughly corresponding to the meridional extent of stratospheric aerosol perturbation for each event. The shading indicates a 30% uncertainty in the calculated SAOD, as estimated from SAGE III coincident comparisons (See Methods).

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