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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-2025-2945</article-id>
<title-group>
<article-title>The elusive 8.2 ka event in speleothems from southern France</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Passelergue</surname>
<given-names>Maddalena</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Couchoud</surname>
<given-names>Isabelle</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Drysdale</surname>
<given-names>Russell N.</given-names>
<ext-link>https://orcid.org/0000-0001-7867-031X</ext-link>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Hellstrom</surname>
<given-names>John</given-names>
<ext-link>https://orcid.org/0000-0001-9427-3525</ext-link>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Hoffmann</surname>
<given-names>Dirk L.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Greig</surname>
<given-names>Alan</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Laboratoire EDYTEM, UMR 5204 Université Savoie Mont Blanc-CNRS, 73376 Le Bourget du Lac, France</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>School of Geography, Earth and Atmospheric Sciences (SGEAS), University of Melbourne, Parkville 3010 VIC, Australia</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Georg-August-Universität Göttingen, GZG - Geochemistry and Isotope Geology, 37077 Göttingen, Germany</addr-line>
</aff>
<pub-date pub-type="epub">
<day>04</day>
<month>07</month>
<year>2025</year>
</pub-date>
<volume>2025</volume>
<fpage>1</fpage>
<lpage>23</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2025 Maddalena Passelergue et al.</copyright-statement>
<copyright-year>2025</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/2025/egusphere-2025-2945/">This article is available from https://egusphere.copernicus.org/preprints/2025/egusphere-2025-2945/</self-uri>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2025/egusphere-2025-2945/egusphere-2025-2945.pdf">The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2025/egusphere-2025-2945/egusphere-2025-2945.pdf</self-uri>
<abstract>
<p>The Holocene is generally considered a climatically stable period, yet a prominent perturbation occurred around 8.2 ka BP. Evidence of its impacts has been identified in many palaeoclimate archives across Europe. However, outside the Atlantic seaboard, no clear high-resolution signal for this event has emerged from southwestern Europe. Here, we investigate the potential impact of the 8.2 ka event in southern France through high-resolution multiproxy analyses of two speleothems from the Ard&amp;egrave;che region. Variations in Mg/Ca and Sr/Ca of the speleothem calcite are attributed to the prior calcite precipitation (PCP) effect and indicate switches between drier and wetter conditions. The &amp;delta;&lt;sup&gt;13&lt;/sup&gt;C signal is likely influenced by soil development and biological activity, integrating both regional climate conditions and local geomorphology. The pattern of speleothem &amp;delta;&lt;sup&gt;18&lt;/sup&gt;O changes do not correlate with regional palaeotemperature reconstructions and is therefore more likely related to hydrology, such as variations in the seasonality of karst recharge and/or the moisture source. During the 8.2 ka event, no distinct geochemical anomaly is recorded by the Ard&amp;egrave;che speleothems, suggesting either a limited climatic impact in southern France or a lack of sensitivity of these speleothem proxies to an event of this magnitude. While the muted &amp;delta;&lt;sup&gt;18&lt;/sup&gt;O response may be explained by a decoupling from temperature and buffering by Mediterranean influences at the time, the absence of a clear hydrological response in Mg/Ca, Sr/Ca and &amp;delta;&lt;sup&gt;13&lt;/sup&gt;C remains unresolved. Therefore, despite a likely southward displacement of the westerlies induced by the 8.2 ka event, the Ard&amp;egrave;che region may have remained under their influence, preventing a marked shift towards drier conditions. Consistent with other records from southern France, our results showing no significant changes around 8.2 ka challenge the spatial extent and uniformity of its climatic impacts across western Europe.</p>
</abstract>
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