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<front>
<journal-meta>
<journal-id journal-id-type="publisher">TCD</journal-id>
<journal-title-group>
<journal-title>The Cryosphere Discussions</journal-title>
<abbrev-journal-title abbrev-type="publisher">TCD</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1994-0440</issn>
<publisher><publisher-name>Copernicus GmbH</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/tcd-6-5119-2012</article-id>
<title-group>
<article-title>Snow spectral albedo at Summit, Greenland: comparison between in situ measurements and numerical simulations using measured physical and chemical properties of the snowpack</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Carmagnola</surname>
<given-names>C. M.</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>Domine</surname>
<given-names>F.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Dumont</surname>
<given-names>M.</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>Wright</surname>
<given-names>P.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Strellis</surname>
<given-names>B.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Bergin</surname>
<given-names>M.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Dibb</surname>
<given-names>J.</given-names>
</name>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Picard</surname>
<given-names>G.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Morin</surname>
<given-names>S.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Météo-France &amp;ndash; CNRS, CNRM &amp;ndash; GAME URA 1357, Centre d&apos;Etudes de la Neige, Grenoble, France</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>CNRS, UJF Grenoble, LGGE, Grenoble, France</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Takuvik Joint International Laboratory, CNRS and Université Laval, Québec (QC), Canada</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>University of Houston, Houston (TX), USA</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>Georgia Institute of Technology, Atlanta (GA), USA</addr-line>
</aff>
<aff id="aff6">
<label>6</label>
<addr-line>University of New Hampshire, Durham (NH), USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>11</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>6</volume>
<issue>6</issue>
<fpage>5119</fpage>
<lpage>5167</lpage>
<permissions>
<license xlink:type="simple">
<license-p>This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
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<self-uri xlink:href="http://www.the-cryosphere-discuss.net/6/5119/2012/tcd-6-5119-2012.pdf">The full text article is available as a PDF file from http://www.the-cryosphere-discuss.net/6/5119/2012/tcd-6-5119-2012.pdf</self-uri>
<abstract>
<p>The albedo of surface snow is determined both by the near-surface
      profile of the physical and chemical properties of the snowpack and by
      the spectral and angular characteristics of the incident solar
      radiation. Simultaneous measurements of the physical and chemical
      properties of snow were carried out at Summit Camp, Greenland
      (72&amp;deg;36´ N, 38&amp;deg;25´ W, 3210 m a.s.l.) in May
      and June 2011, along with spectral albedo measurements. One of the
      main objectives of the field campaign was to test our ability to
      predict snow albedo comparing measured snow spectral albedo to the
      albedo calculated with a radiative transfer model.  To achieve this
      goal, we made daily measurements of the snow spectral albedo in the
      range 350–2200 nm and recorded snow stratigraphic information
      down to roughly 80 cm. The snow specific surface area (SSA)
      was measured using the DUFISSS instrument  (DUal Frequency Integrating
      Sphere for Snow SSA measurement, Gallet et al., 2009). Samples were
      also collected for chemical analyses including black carbon (BC) and
      trace elements, to evaluate the impact of light absorbing particulate
      matter in snow. This is one of the most comprehensive albedo-related
      data sets combining chemical analysis, snow physical properties and
      spectral albedo measurements obtained in a polar environment. The
      surface albedo was calculated from density, SSA, BC and dust profiles
      using the DISORT model
      (DIScrete Ordinate Radiative Transfer, Stamnes et al., 1988) and compared to the measured values. Results
      indicate that the energy absorbed by the snowpack through the whole
      spectrum considered can be inferred within 1.35%. This
      accuracy is only slightly better than that which can be obtained
      considering pure snow, meaning that the impact of impurities on the
      snow albedo is small at Summit. In the visible region, the
      discrepancies between measured and simulated albedo are mostly due to
      the lack of correction of the cosine collector deviation from a true
      cosine response. In the near-infrared, minor deviations up to 0.014
      can be due the accuracy of SSA measurements and to the surface
      roughness, whereas deviations up to 0.05 can be explained by the
      vertical resolution of measurements of surface layer physical
      properties. At 1430 and around 1800 nm the discrepancies are
      larger and independent of the snow properties; they may be due to the
      uncertainties in the ice refractive index at these wavelengths. This
      work contributes to the development of physically-based albedo schemes
      in detailed snowpack models, and to the improvement of retrieval
      algorithms for estimating snow properties from remote sensing data.</p>
</abstract>
<counts><page-count count="49"/></counts>
</article-meta>
</front>
<body/>
<back>
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