Journal article Open Access

Evaluation of aMetOp ASCAT-Derived Surface Soil Moisture Product in Tundra Environments

Högström, Elin; Heim, Birgit; Bartsch, Annett; Bergstedt, Helena; Pointner, Georg


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  <identifier identifierType="URL">https://zenodo.org/record/2636627</identifier>
  <creators>
    <creator>
      <creatorName>Högström, Elin</creatorName>
      <givenName>Elin</givenName>
      <familyName>Högström</familyName>
      <affiliation>Austrian Polar Research Institute</affiliation>
    </creator>
    <creator>
      <creatorName>Heim, Birgit</creatorName>
      <givenName>Birgit</givenName>
      <familyName>Heim</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0003-2614-9391</nameIdentifier>
      <affiliation>AWI</affiliation>
    </creator>
    <creator>
      <creatorName>Bartsch, Annett</creatorName>
      <givenName>Annett</givenName>
      <familyName>Bartsch</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-3737-7931</nameIdentifier>
      <affiliation>b.geos</affiliation>
    </creator>
    <creator>
      <creatorName>Bergstedt, Helena</creatorName>
      <givenName>Helena</givenName>
      <familyName>Bergstedt</familyName>
      <affiliation>University of Salzburg</affiliation>
    </creator>
    <creator>
      <creatorName>Pointner, Georg</creatorName>
      <givenName>Georg</givenName>
      <familyName>Pointner</familyName>
      <affiliation>b.geos</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Evaluation of aMetOp ASCAT-Derived Surface Soil Moisture Product in Tundra Environments</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2018</publicationYear>
  <dates>
    <date dateType="Issued">2018-11-12</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/2636627</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1029/2018JF004658</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://zenodo.org/communities/nunataryuk</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;Satellite-derived surface soil moisture data are available for the Arctic, but detailed validation&lt;br&gt;
is still lacking. Previous studies have shown low correlations between in situ and modeled data. It is&lt;br&gt;
hypothesized that soil temperature variations after soil thaw impact MetOp ASCAT satellite-derived surface&lt;br&gt;
soil moisture (SSM) measurements in wet tundra environments, as C band backscatter is sensitive to&lt;br&gt;
changes in dielectric properties. We compare in situ measurements of water content within the active layer&lt;br&gt;
at four sites across the Arctic in Alaska (Barrow, Sagwon, Toolik) and Siberia (Tiksi), taken in the spring after&lt;br&gt;
thawing and in autumn prior to freezing. In addition to the long-term measurement fields, where sensors&lt;br&gt;
are installed deeper in the ground, we designed a monitoring setup for measuring moisture very close&lt;br&gt;
to the surface in the Lena River Delta, Siberia. The volumetric water content (VWC) and soil temperature&lt;br&gt;
sensors were placed in the moss organic layer in order to account for the limited penetration depth of&lt;br&gt;
the radar signal. ASCAT SSM variations are generally very small, in line with the low variability of in situ&lt;br&gt;
VWC. Short-term changes after complete thawing of the upper organic layer, however, seem to be mostly&lt;br&gt;
influenced by soil temperature. Correlations between SSM and in situ VWC are generally very low, or even&lt;br&gt;
negative. Mean standard deviation matching results in a comparably high root-mean-square error (on&lt;br&gt;
average 11%) for predictions of VWC. Further investigations and measurement networks are needed to&lt;br&gt;
clarify factors causing temporal variation of C band backscatter in tundra regions.&lt;/p&gt;</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100000780</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/773421/">773421</awardNumber>
      <awardTitle>Permafrost thaw and the changing arctic coast: science for socio-economic adaptation</awardTitle>
    </fundingReference>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100000780</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/FP7/282700/">282700</awardNumber>
      <awardTitle>Changing Permafrost in the Arctic and its Global Effects in the 21st Century</awardTitle>
    </fundingReference>
    <fundingReference>
      <funderName>Austrian Science Fund</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100002428</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/FWF/Doktoratskollegs+%28DKs%29/W+1237/">W 1237</awardNumber>
      <awardTitle>Geographic Information Science. Integrating interdisciplinary concepts and methods</awardTitle>
    </fundingReference>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100000780</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/FP7/262693/">262693</awardNumber>
      <awardTitle>International Network for Terrestrial Research and Monitoring in the Arctic</awardTitle>
    </fundingReference>
  </fundingReferences>
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