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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-2026-856</article-id>
<title-group>
<article-title>Dual-frequency profiler study of hydrometeor fall speeds in tropical deep convection</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Giangrande</surname>
<given-names>Scott Edward</given-names>
<ext-link>https://orcid.org/0000-0002-8119-8199</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>Williams</surname>
<given-names>Christopher R.</given-names>
<ext-link>https://orcid.org/0000-0001-9394-8850</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>Protat</surname>
<given-names>Alain</given-names>
<ext-link>https://orcid.org/0000-0002-8933-874X</ext-link>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Environmental Science and Technologies Department, Brookhaven National Laboratory, Upton, NY, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>University of Colorado, Boulder, CO, 80309, United States</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Bureau of Meteorology, Melbourne, Victoria, Australia</addr-line>
</aff>
<pub-date pub-type="epub">
<day>10</day>
<month>04</month>
<year>2026</year>
</pub-date>
<volume>2026</volume>
<fpage>1</fpage>
<lpage>25</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2026 Scott Edward Giangrande 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-2026-856/">This article is available from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-856/</self-uri>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2026/egusphere-2026-856/egusphere-2026-856.pdf">The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-856/egusphere-2026-856.pdf</self-uri>
<abstract>
<p>This study investigates hydrometeor fall speeds using a dual-frequency profiling radar operating during the 2005&amp;ndash;2006 monsoon season near Darwin, Australia. Our focus is on tropical deep convection where the observations provide a new perspective on hydrometeor fall speeds within and near intense drafts having mixed-phase media. The techniques we employ avoid undue assumptions on the air motion or media distributions, offering a convenient path to estimate bulk radar reflectivity(Z)-weighted hydrometeor fall speed Vt. While these mixed-phase media estimates are not specific to size or density, they may be replicated by models and are practical for radar-based retrievals that necessitate Vt assumptions.&lt;/p&gt;
&lt;p&gt;Tests performed under rain and snow conditions show comparable performance to disdrometer and other references. The standard deviation of residuals for rain and snow relationships are &amp;cong; 1 ms&lt;sup&gt;-1&lt;/sup&gt; and &amp;cong; 0.4 ms&lt;sup&gt;-1&lt;/sup&gt;, respectively. In convective core regions aloft, Darwin observations align with existing graupel Vt-Z treatments, however mixed-phase media typically falls faster (&amp;gt; 1&amp;ndash;2 ms&lt;sup&gt;-1&lt;/sup&gt;) for Z &amp;lt; 35 dBZ than prior relationships. Breakdowns suggest that Active and Break monsoon conditions favor a similar Vt-Z behavior in strong cores. However, Break conditions &amp;ndash; those more favorable to intense daytime tropical convection &amp;ndash; potentially indicate the presence of additional lofted liquid or melting media mixed in volumes at convective core peripheries Z &amp;lt; 35 dBZ. Break events also show higher variability in Vt-Z pairs, with select samples having Vt faster than rain for a given Z that argues for partially-melted graupel coupled with size-sorting.</p>
</abstract>
<counts><page-count count="25"/></counts>
<funding-group>
<award-group id="gs1">
<funding-source>Biological and Environmental Research</funding-source>
<award-id>DE-SC0012704</award-id>
</award-group>
</funding-group>
</article-meta>
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