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<front>
<journal-meta>
<journal-id journal-id-type="publisher">OSD</journal-id>
<journal-title-group>
<journal-title>Ocean Science Discussions</journal-title>
<abbrev-journal-title abbrev-type="publisher">OSD</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">Ocean Sci. Discuss.</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1812-0822</issn>
<publisher><publisher-name></publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/os-2020-46</article-id>
<title-group>
<article-title>Evidence of coastal trapped wave scattering using high-frequency
radar data in the Mid-Atlantic Bight</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Brunner</surname>
<given-names>Kelsey</given-names>
<ext-link>https://orcid.org/0000-0003-4305-4677</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>Lwiza</surname>
<given-names>Kamazima M. M.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Stony Brook University, School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>02</day>
<month>07</month>
<year>2020</year>
</pub-date>
<volume>2020</volume>
<fpage>1</fpage>
<lpage>23</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2020 Kelsey Brunner</copyright-statement>
<copyright-year>2020</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://os.copernicus.org/preprints/os-2020-46/">This article is available from https://os.copernicus.org/preprints/os-2020-46/</self-uri>
<self-uri xlink:href="https://os.copernicus.org/preprints/os-2020-46/os-2020-46.pdf">The full text article is available as a PDF file from https://os.copernicus.org/preprints/os-2020-46/os-2020-46.pdf</self-uri>
<abstract>
<p>Coastal trapped waves (CTWs) become scattered when they encounter irregular coastlines and bathymetry during propagation. Analytical and modeling studies have provided some information about the different types of shelf geometries that can induce scattering, but much of the CTW scattering process generally remains a large knowledge gap. Furthermore, CTW scattering has never before been directly identified with observations. High-frequency radar surface velocity data covering the Mid-Atlantic Bight (MAB) continental shelf provides unprecedented observations of CTWs within a region with a highly complex coastline and bathymetry. A combination of velocity vector maps from real vector empirical orthogonal function (R-EOF) analysis and phase maps from complex empirical orthogonal function (C-EOF) analysis allow the identification of CTW scattering by assuming each EOF mode corresponds to a CTW mode. Abrupt jumps in phase in association with magnitude amplification/reduction or directional rotation of velocity vectors are indications of scattering. Using these guidelines, Georges Bank, Hudson Shelf Valley, Delaware Bay mouth, Chesapeake Bay mouth, and the North Carolina shelf are identified as high scattering regions within the MAB. Furthermore, stratification is confirmed to increase scattering into progressively higher order modes through a cascading process by comparing winter and summer cases, which supports previous theoretical and numerical model predictions. The simple methodology used here can be applied to observations of CTWs on other coastlines around the world to identify additional scattering regions and help close the knowledge gap.</p>
</abstract>
<counts><page-count count="23"/></counts>
</article-meta>
</front>
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