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\begin{document}

\title{Early Evolution of the Hunga-Tonga Stratospheric Aerosol Plume observed
by Lidar at La R\selectlanguage{ngerman}éunion (21°S, 55°E)\selectlanguage{english}}



\author[1]{Alexandre Baron}%
\author[2]{P Chazette}%
\author[3]{S Khaykin}%
\author[4]{G Payen}%
\author[4]{N Marquestaut}%
\author[1]{N Bègue}%
\author[1]{V Duflot}%
\affil[1]{Laboratoire de l’Atmosphère et des Cyclones (LACy), UMR 8105 CNRS, Université de la Réunion, Météo-France, 97400 Saint-Denis de La Réunion, France}%
\affil[2]{Université Paris-Saclay -CEA -CNRS -UVSQ}%
\affil[3]{Sorbonne Université -UVSQ -CNRS}%
\affil[4]{Observatoire des Sciences de l'Univers de La Réunion (OSU-Réunion)}%


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  \date{May 08, 2024}


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\begin{abstract}
The highly-explosive eruption of the Hunga-Tonga Hunga Ha'apai volcano
(HTHH), that occurred on 15 Jan. in the South Pacific, was associated
with a powerful blast that injected gases, steam and aerosols to
unprecedentedly high altitudes. Here we present unique observations of
the young volcanic aerosol plumes by ground-based lidars at La Reunion
island (21\selectlanguage{ngerman}°S, 55°E), located directly downwind of the eruption. Two
lidars, operating at 355 nm and 532 nm, sampled the overflying plume
every nights from 19 Jan. until 28 Jan. We assess both the vertical
structure and the optical properties. A wide plume altitude range from
36 km down to 18 km has been highlighted along time, with heterogeneous
aerosol optical depth that reached 0.84 at 532 nm and Angström exponents
from-0.8 to 1.2. Such temporal evolution is related to both the
injection heights of the volcanic material and the stratospheric dynamic
and chemistry.%
\end{abstract}\selectlanguage{ngerman}%



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