Fig. 3: Longer-term HT plume evolution and its comparison with recent past events.
From: The unexpected radiative impact of the Hunga Tonga eruption of 15th January 2022
Zonal average IMS/IASI SO2 observations (a), sulfate-specific AOD (b) and their ratio (c), for the first month of HT plume dispersion. Black triangles in a–c indicate the main HT eruption of January 15th (large triangle) and the previous smaller event of January 14th (that had a small but visible impact on the SO2 distributions). Time series of the OMPS-LP zonal average SAOD (d) and tropical (Tropics: 30°N–30°S, red line), Northern Hemisphere (NH: 0–80°N, blue line), Southern Hemisphere (SH: 0–80°S, green line) and global (Global: 80°N–80°S, black line) SAOD (e). The OMPS-LP time series are updated to 15th June 2022. Global, Tropical, Northern Hemispheric and Southern Hemispheric peak SAOD values for the stratospheric events: HT eruption in 2022 (HT2022), Australian fires in 2019-2020 (AF2020), Raikoke eruption in 2019 (Ra2019), Nabro eruption in 2011 (Na2011), from OMPS-LP observations, and Pinatubo eruption in 1991 (Pi1991) and El Chichon eruption in 1982 (EC1982), from the GloSSAC database (f).
