Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 9, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL098131
Keywords
stereo; volcanic plume; Hunga Tonga; stratosphere; GNSS-RO
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Funding
- NASA Goddard Space Flight Center through Support for Atmospheres, Modeling, and Data Assimilation (SAMDA) [NNG17HP01C]
- Deutsche Forschungsgemeinschaft (DFG) [BU 2253/7-1]
- NASA's Terra Project
- Sun-Climate research
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Stereo methods using GOES-17 and Himawari-8 satellites revealed that the Hunga Tonga-Hunga Ha'apai volcanic plume reached a record altitude of 50-55 km on January 15, 2022. This information is crucial for understanding plume height, dispersion, transport in the stratosphere, and climate impacts.
Stereo methods using GOES-17 and Himawari-8 applied to the Hunga Tonga-Hunga Ha'apai volcanic plume on 15 January 2022 show overshooting tops reaching 50-55 km altitude, a record in the satellite era. Plume height is important to understand dispersal and transport in the stratosphere and climate impacts. Stereo methods, using geostationary satellite pairs, offer the ability to accurately capture the evolution of plume top morphology quasi-continuously over long periods. Manual photogrammetry estimates plume height during the most dynamic early phase of the eruption and a fully automated algorithm retrieves both plume height and advection every 10 min during a more frequently sampled and stable phase beginning 3 hr after the eruption. Stereo heights are confirmed with Global Navigation Satellite System Radio Occultation bending angles, showing that much of the plume was lofted 30-40 km into the atmosphere. Cold bubbles are observed in the stratosphere with brightness temperature of similar to 173 K.
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