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<front>
<journal-meta>
<journal-id journal-id-type="publisher">EGUsphere</journal-id>
<journal-title-group>
<journal-title>EGUsphere</journal-title>
<abbrev-journal-title abbrev-type="publisher">EGUsphere</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">EGUsphere</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub"></issn>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/egusphere-2026-2575</article-id>
<title-group>
<article-title>Optical properties and global distribution of the Hunga aerosols 2022 observed by Aeolus and atmospheric lidars: new insights into the vertical sedimentation of stratospheric sulfate plumes</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Trapon</surname>
<given-names>Dimitri</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Baars</surname>
<given-names>Holger</given-names>
<ext-link>https://orcid.org/0000-0002-2316-8960</ext-link>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Bley</surname>
<given-names>Sebastian</given-names>
<ext-link>https://orcid.org/0000-0003-1119-7067</ext-link>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Ansmann</surname>
<given-names>Albert</given-names>
<ext-link>https://orcid.org/0000-0001-5382-8440</ext-link>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Rennie</surname>
<given-names>Michael</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Khaykin</surname>
<given-names>Sergey</given-names>
<ext-link>https://orcid.org/0000-0002-5466-1096</ext-link>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Sicard</surname>
<given-names>Michael</given-names>
<ext-link>https://orcid.org/0000-0001-8287-9693</ext-link>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Leibniz Institute for Tropospheric Research (TROPOS), Remote Sensing of Atmospheric Processes Department, Leipzig, Germany</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>European Centre for Medium-Range Weather Forecasts, Research Department, Reading, United Kingdom</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Laboratoire Atmosphère Observations Spatiales (LATMOS), CNRS, Sorbonne University, Guyancourt, France</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Laboratoire de l’Atmosphère et des Cyclones (LACy), Saint-Denis de la Réunion, France</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>CommSensLab, Department of Signal Theory and Communications, Universitat Politècnica de Catalunya, Barcelona, Spain</addr-line>
</aff>
<pub-date pub-type="epub">
<day>26</day>
<month>05</month>
<year>2026</year>
</pub-date>
<volume>2026</volume>
<fpage>1</fpage>
<lpage>31</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2026 Dimitri Trapon et al.</copyright-statement>
<copyright-year>2026</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/4.0/">https://creativecommons.org/licenses/by/4.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2026/egusphere-2026-2575/">This article is available from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-2575/</self-uri>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2026/egusphere-2026-2575/egusphere-2026-2575.pdf">The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-2575/egusphere-2026-2575.pdf</self-uri>
<abstract>
<p>Stratospheric aerosol plumes from the 2022 Hunga eruption were observed by the first-ever ultraviolet (UV) 355 nm Doppler and High Spectral Resolution Lidar (HSRL) on board the European Space Agency&amp;rsquo;s Aeolus satellite. Independent measurement of extinction and co-polarized backscatter coefficients for particles are shown, capturing the Hunga plumes up to &amp;asymp; 28 km in altitude. Global map of L2A product are produced for latitudes band up to [35&amp;deg; S&amp;ndash;10&amp;deg; N]. They are analysed with sulphur dioxide (SO&lt;sub&gt;2&lt;/sub&gt;) concentration and sulfate aerosol (SA) optical depth (OD). A plume composed of optically thick patches with high SA OD above 0.025 is captured above 26 km in altitude. It exhibits high UV signal extinction up to 350 Mm⁻&amp;sup1;, scattering ratio (SR) up to 40, local optical depth (LOD) above 0.2, and lidar ratio (LR) above 100 sr. These SA long-lived patches are observed drifting south and transported west. Two branches separate by mid February 2022: a southern tale at &amp;asymp; 25 to 27 km in altitude around latitudes [30&amp;deg; S&amp;ndash;15&amp;deg; S] and a northern tale at &amp;asymp; 23 to 25 km in altitude around latitudes [15&amp;deg; S&amp;ndash;10&amp;deg; N]. The LR and LOD measured by Aeolus for the ageing branches reveal lower values below 80 sr and 0.04 respectively. A short-lived plume with low SA OD and high SO&lt;sub&gt;2&lt;/sub&gt; concentration is observed at lower altitudes &amp;asymp; 18 to 22 km with less strong UV scattering properties, and appears to disaggregate quickly.</p>
</abstract>
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