Fig. 2: The physicochemical properties of the early HT plume.
From: The unexpected radiative impact of the Hunga Tonga eruption of 15th January 2022
IMS/IASI SO2 (a) and sulfate-specific AOD (b) observations for 16th January at 23:07 UTC. a, b the red line is CALIOP track for the same day at 15:41 UTC. OMPS-LP integrated SAOD (c) and vertical aerosol extinction profile (central detector, d) for 16th January at 2:03 and 3:27 UTC. d the red line is tropopause height. Attenuated CALIOP backscatter at 532 nm (e), and integrated in-plume AOD (f), corrected transmission (g) extinction (h) and depolarisation (i) in the two identified plumes sections (pink and green squares). The CALIOP track of e–i is the one identified in a and b. Due to the time mismatch between CALIOP and IASI orbits, the CALIOP trace actually crossed both the eastern part of the aerosol plume in a, b (lower plume at 27 km) and the western part (upper plume at 30 km) which has already reached Australia in the display.
