On the Variability of the Stratospheric Aerosols

Long-term balloon-borne in-situ aerosol measurements over Tibetan Plateau suggests that the variability of the stratospheric aerosols is high in the upper troposphere and lower stratosphere (UTLS), and low above 20 km. Similar findings are reported by balloon-borne in-situ measurements over Boulder from 2019 and 2022. Based on a sectional aerosol model coupled with climate model (CESM-CARMA), we diagnosed the influence from volcanic and wildfire activities on the stratospheric aerosol budget, variability and size distributions in recent years. Besides, the source, budget and variability of the “background” (non-volcanic nor wildfire) stratospheric aerosol are analyzed.