Measurement report: Plume heights of the April 2021 La Soufrière eruptions from GOES-17 side views and GOES-16–MODIS stereo views
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Published:2022-09-21
Issue:18
Volume:22
Page:12311-12330
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Horváth ÁkosORCID, Carr James L., Wu Dong L.ORCID, Bruckert Julia, Hoshyaripour Gholam Ali, Buehler Stefan A.ORCID
Abstract
Abstract. We estimated geometric plume heights for the daytime
eruptions of La Soufrière in April 2021 using visible red band
geostationary side views and geostationary–polar orbiter stereo views. Most
of the plumes either spread near the tropopause at 16–17 km altitude or
penetrated the stratosphere at 18–20 km altitude. Overshooting tops reached
heights of up to 23 km. These geometric heights were compared with radiometric
heights corresponding to the coldest plume temperature, which usually
represent ambiguous estimates within a wide range between a tropospheric and a
stratospheric height match. The tropospheric lower bound of the radiometric
height range always underestimated the geometric height by a couple of
kilometers, even for smaller plumes. For plumes near or above the
tropopause, the midpoint or the stratospheric upper bound of the radiometric
height range was in reasonable agreement with the geometric heights. The
geometric overshooting top height, however, was always above the radiometric
height range. We also found that geometric plume heights can be estimated
from infrared band side views too, albeit with increased uncertainty
compared to the visible red band. This opens up the possibility of applying
the side view method to nighttime eruptions.
Funder
Deutsche Forschungsgemeinschaft
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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