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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-2025-4702</article-id>
<title-group>
<article-title>Characterizing Near-Surface Permafrost in Utqiaġvik, Alaska, using Electrical Resistivity Tomography and Ground Penetrating Radar</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Ekimova</surname>
<given-names>Valentina</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>Nelson</surname>
<given-names>MacKenzie A.</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>Sullivan</surname>
<given-names>Taylor</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>Douglas</surname>
<given-names>Thomas A.</given-names>
<ext-link>https://orcid.org/0000-0003-1314-1905</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>Epstein</surname>
<given-names>Howard E.</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>Jull</surname>
<given-names>Matthew G.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904-4123, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Environmental Institute, University of Virginia, Charlottesville, VA 22902, USA</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>U.S. Army Engineer Research and Development Center Cold Regions Research and Engineering Laboratory, Fort Wainwright, AK 99703-0170, USA</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Department of Architecture, University of Virginia, Charlottesville, VA 22903, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>08</day>
<month>10</month>
<year>2025</year>
</pub-date>
<volume>2025</volume>
<fpage>1</fpage>
<lpage>29</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2025 Valentina Ekimova 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-2025-4702/">This article is available from https://egusphere.copernicus.org/preprints/2025/egusphere-2025-4702/</self-uri>
<self-uri xlink:href="https://egusphere.copernicus.org/preprints/2025/egusphere-2025-4702/egusphere-2025-4702.pdf">The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2025/egusphere-2025-4702/egusphere-2025-4702.pdf</self-uri>
<abstract>
<p>Permafrost degradation in Arctic lowlands is a critical geomorphic process, increasingly driven by climate warming and infrastructure development. This study applies an integrated geophysical and surveying approach &amp;ndash; Electrical Resistivity Tomography (ERT), Ground Penetrating Radar (GPR), and thaw probing &amp;ndash; to characterize near-surface permafrost variability across four land use types in Utqiaġvik, Alaska: gravel road, snow fence, residential building and undisturbed tundra. Results reveal pronounced heterogeneity in thaw depths (0.2 to &amp;gt;1 m) and ice content, shaped by both natural features such as ice wedges and frost heave and anthropogenic disturbances. Roads and snow fences altered surface drainage and snow accumulation, promoting differential thaw, deeper active layers, and localized ground deformation. Buildings in permafrost regions alter the local thermal regime through multiple interacting factors &amp;ndash; for example, solar radiation, thermal leakage, snow cover dynamics, and surface disturbance &amp;ndash; among others. ERT identified high-resistivity zones (&amp;gt;1,000 &amp;Omega;&amp;middot;m) interpreted as ice-rich permafrost and low-resistivity features (&amp;lt;5 &amp;Omega;&amp;middot;m) likely associated with cryopegs or thaw zones. GPR delineated subsurface stratigraphy and supported interpretation of ice-rich layers and permafrost features. These findings underscore the strong spatial coupling between surface infrastructure and subsurface thermal and hydrological regimes in ice-rich permafrost. Geophysical methods revealed subsurface features and thaw depth variations across different land use types in Utqiaġvik, highlighting how infrastructure alters permafrost conditions. These findings support localized assessment of ground stability in Arctic environments.</p>
</abstract>
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<funding-group>
<award-group id="gs1">
<funding-source>National Science Foundation</funding-source>
<award-id>2022639</award-id>
</award-group>
</funding-group>
</article-meta>
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