Preprints
https://doi.org/10.5194/acp-2022-253
https://doi.org/10.5194/acp-2022-253
 
10 May 2022
10 May 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: Plume heights of the April 2021 La Soufrière eruptions from GOES-17 side views and GOES-16–MODIS stereo views

Ákos Horváth1, James L. Carr2, Dong L. Wu3, Julia Bruckert4, Gholam Ali Hoshyaripour4, and Stefan A. Buehler1 Ákos Horváth et al.
  • 1Meteorological Institute, Universität Hamburg, Hamburg, Germany
  • 2Carr Astronautics, Greenbelt, MD, USA
  • 3NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 4Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

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 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 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 the possibility for applying the side view method to night time eruptions.

Ákos Horváth et al.

Status: open (until 24 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-253', Anonymous Referee #1, 24 May 2022 reply

Ákos Horváth et al.

Data sets

NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 1b Radiances GOES-R Calibration Working Group and GOES-R Series Program https://doi.org/10.7289/V5BV7DSR

Ákos Horváth et al.

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Short summary
We estimate plume heights for the April 2021 La Soufriere daytime eruptions using GOES-17 near-limb side views and GOES-16–MODIS stereo views. These geometric heights are then compared with brightness temperature-based radiometric height estimates to characterize the biases of the latter. We also show that the side view method can be applied to infrared imagery and thus night time eruptions, albeit with larger uncertainty.
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