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  <Entry_ID>G02158</Entry_ID>
  <Entry_Title>Snow Data Assimilation System (SNODAS) Data Products at NSIDC</Entry_Title>
  <Data_Set_Citation>
    <Dataset_Creator>National Operational Hydrologic Remote Sensing Center. </Dataset_Creator>
    <Dataset_Title>Snow Data Assimilation System (SNODAS) Data Products at NSIDC</Dataset_Title>
    <Dataset_Release_Date>2004-03-29</Dataset_Release_Date>
    <Dataset_Release_Place>Boulder, Colorado USA</Dataset_Release_Place>
    <Dataset_Publisher>NSIDC: National Snow and Ice Data Center</Dataset_Publisher>
    <Online_Resource>http://nsidc.org/data/g02158.html</Online_Resource>
    <Dataset_DOI>http://dx.doi.org/10.7265/N5TB14TC</Dataset_DOI>
  </Data_Set_Citation>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>Tom</First_Name>
    <Last_Name>Carroll</Last_Name>
    <Contact_Address>
      <Address>National Weather Service</Address>
      <Address>National Operational Hydrologic Remote Sensing Center</Address>
      <Address>National Weather Service</Address>
      <Address>National Operational Hydrologic Remote Sensing Center</Address>
      <Address>1735 Lake Drive W.</Address>
      <City>Chanhassen</City>
      <Province_or_State>MN</Province_or_State>
      <Postal_Code>55317</Postal_Code>
      <Country>USA</Country>
    </Contact_Address>
  </Personnel>
  <Personnel>
    <Role>Technical Contact</Role>
    <First_Name>NSIDC</First_Name>
    <Last_Name>User Services</Last_Name>
    <Email>nsidc@nsidc.org</Email>
    <Phone>1 303 492-6199 x</Phone>
    <Fax>1 303  492-2468 x</Fax>
    <Contact_Address>
      <Address>National Snow and Ice Data Center</Address>
      <Address>CIRES, 449 UCB</Address>
      <Address>University of Colorado</Address>
      <City>Boulder</City>
      <Province_or_State>CO</Province_or_State>
      <Postal_Code>80309-0449</Postal_Code>
      <Country>USA</Country>
    </Contact_Address>
  </Personnel>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Atmosphere</Topic>
    <Term>Atmospheric Water Vapor</Term>
    <Variable_Level_1>Sublimation</Variable_Level_1>
    <Detailed_Variable>Blowing Snow Sublimation</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Atmosphere</Topic>
    <Term>Atmospheric Water Vapor</Term>
    <Variable_Level_1>Sublimation</Variable_Level_1>
    <Detailed_Variable>Snow Pack Sublimation</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Atmosphere</Topic>
    <Term>Precipitation</Term>
    <Variable_Level_1>Precipitation Amount</Variable_Level_1>
    <Detailed_Variable>Scaled Precipitation  Non-Snow</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Atmosphere</Topic>
    <Term>Precipitation</Term>
    <Variable_Level_1>Precipitation Amount</Variable_Level_1>
    <Detailed_Variable>Scaled Precipitation - Snow</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Atmosphere</Topic>
    <Term>Precipitation</Term>
    <Variable_Level_1>Rain</Variable_Level_1>
    <Detailed_Variable>Liquid Precipitation</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Cryosphere</Topic>
    <Term>Snow/Ice</Term>
    <Variable_Level_1>Snow Depth</Variable_Level_1>
    <Detailed_Variable>Snowpack Thickness</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Cryosphere</Topic>
    <Term>Snow/Ice</Term>
    <Variable_Level_1>Snow/Ice Temperature</Variable_Level_1>
    <Detailed_Variable>Snowpack Average Temperature</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Cryosphere</Topic>
    <Term>Snow/Ice</Term>
    <Variable_Level_1>Snow Melt</Variable_Level_1>
    <Detailed_Variable>Snow Melt Rate</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Cryosphere</Topic>
    <Term>Snow/Ice</Term>
    <Variable_Level_1>Snow Water Equivalent</Variable_Level_1>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Terrestrial Hydrosphere</Topic>
    <Term>Snow/Ice</Term>
    <Variable_Level_1>Snow Depth</Variable_Level_1>
    <Detailed_Variable>Snowpack Thickness</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Terrestrial Hydrosphere</Topic>
    <Term>Snow/Ice</Term>
    <Variable_Level_1>Snow/Ice Temperature</Variable_Level_1>
    <Detailed_Variable>Snowpack Average Temperature</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Terrestrial Hydrosphere</Topic>
    <Term>Snow/Ice</Term>
    <Variable_Level_1>Snow Melt</Variable_Level_1>
    <Detailed_Variable>Snow Melt Rate</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>Terrestrial Hydrosphere</Topic>
    <Term>Snow/Ice</Term>
    <Variable_Level_1>Snow Water Equivalent</Variable_Level_1>
  </Parameters>
  <ISO_Topic_Category>Climatology/Meteorology/Atmosphere</ISO_Topic_Category>
  <Keyword>g02158</Keyword>
  <Keyword>Modeling</Keyword>
  <Keyword>National Operational Hydrologic Remote Sensing Center</Keyword>
  <Keyword>NOAA</Keyword>
  <Keyword>NOHRSC</Keyword>
  <Keyword>Numerical Weather Prediction</Keyword>
  <Keyword>NWP</Keyword>
  <Keyword>SNODAS</Keyword>
  <Keyword>Snow Cover</Keyword>
  <Keyword>SNOw Data Assimilation System</Keyword>
  <Keyword>Snow Water Equivalent</Keyword>
  <Keyword>SWE</Keyword>
  <Source_Name>
    <Short_Name>AIRCRAFT</Short_Name>
  </Source_Name>
  <Source_Name>
    <Short_Name>GROUND STATIONS</Short_Name>
  </Source_Name>
  <Source_Name>
    <Short_Name>MODELS</Short_Name>
  </Source_Name>
  <Source_Name>
    <Short_Name>SATELLITES</Short_Name>
  </Source_Name>
  <Temporal_Coverage>
    <Start_Date>2003-09-28</Start_Date>
    <Stop_Date>2013-05-20</Stop_Date>
  </Temporal_Coverage>
  <Data_Set_Progress>in work</Data_Set_Progress>
  <Spatial_Coverage>
    <Southernmost_Latitude>24.9504</Southernmost_Latitude>
    <Northernmost_Latitude>52.8754</Northernmost_Latitude>
    <Westernmost_Longitude>-124.7337</Westernmost_Longitude>
    <Easternmost_Longitude>-66.9421</Easternmost_Longitude>
  </Spatial_Coverage>
  <Data_Resolution>
    <Latitude_Resolution>1 km</Latitude_Resolution>
    <Longitude_Resolution>1 km</Longitude_Resolution>
    <Temporal_Resolution>1 day</Temporal_Resolution>
  </Data_Resolution>
  <Data_Set_Language>English</Data_Set_Language>
  <Originating_Center>NSIDC_NOAA</Originating_Center>
  <Data_Center>
    <Data_Center_Name>
      <Short_Name>NSIDC_DAAC</Short_Name>
      <Long_Name>NASA DAAC at the National Snow and Ice Data Center</Long_Name>
    </Data_Center_Name>
    <Data_Center_URL>http://nsidc.org/daac/index.html</Data_Center_URL>
    <Personnel>
      <Role>Data Center Contact</Role>
      <First_Name>NSIDC</First_Name>
      <Last_Name>User Services</Last_Name>
      <Email>nsidc@nsidc.org</Email>
      <Phone>1 303 492-6199 </Phone>
      <Fax>1 303  492-2468 </Fax>
      <Contact_Address>
        <Address>National Snow and Ice Data Center</Address>
        <Address>CIRES, 449 UCB</Address>
        <Address>University of Colorado</Address>
        <City>Boulder</City>
        <Province_or_State>CO</Province_or_State>
        <Postal_Code>80309-0449</Postal_Code>
        <Country>USA</Country>
      </Contact_Address>
    </Personnel>
  </Data_Center>
  <Data_Center>
    <Data_Center_Name>
      <Short_Name>NSIDC</Short_Name>
      <Long_Name>National Snow and Ice Data Center</Long_Name>
    </Data_Center_Name>
    <Data_Center_URL>http://nsidc.org</Data_Center_URL>
    <Personnel>
      <Role>Data Center Contact</Role>
      <First_Name>NSIDC</First_Name>
      <Last_Name>User Services</Last_Name>
      <Email>nsidc@nsidc.org</Email>
      <Phone>1 303 492-6199 </Phone>
      <Fax>1 303  492-2468 </Fax>
      <Contact_Address>
        <Address>National Snow and Ice Data Center</Address>
        <Address>CIRES, 449 UCB</Address>
        <Address>University of Colorado</Address>
        <City>Boulder</City>
        <Province_or_State>CO</Province_or_State>
        <Postal_Code>80309-0449</Postal_Code>
        <Country>USA</Country>
      </Contact_Address>
    </Personnel>
  </Data_Center>
  <Data_Center>
    <Data_Center_Name>
      <Short_Name>NSIDC_NOAA</Short_Name>
      <Long_Name>NSIDC National Oceanic and Atmospheric Administration</Long_Name>
    </Data_Center_Name>
    <Data_Center_URL>http://nsidc.org/noaa/</Data_Center_URL>
    <Personnel>
      <Role>Data Center Contact</Role>
      <First_Name>NSIDC NOAA</First_Name>
      <Last_Name>User Services</Last_Name>
      <Email>nsidc@nsidc.org</Email>
      <Phone>1 303 492-6199 </Phone>
      <Fax>1 303  492-2468 </Fax>
      <Contact_Address>
        <Address>National Snow and Ice Data Center</Address>
        <Address>CIRES, 449 UCB</Address>
        <Address>University of Colorado</Address>
        <City>Boulder</City>
        <Province_or_State>CO</Province_or_State>
        <Postal_Code>80309-0449</Postal_Code>
        <Country>USA</Country>
      </Contact_Address>
    </Personnel>
  </Data_Center>
  <Distribution>
    <Distribution_Media>FTP</Distribution_Media>
    <Distribution_Size>2 - 25 MB</Distribution_Size>
    <Distribution_Format>ASCII Text</Distribution_Format>
  </Distribution>
  <Reference>Barrett, Andy. 2003. National Operational Hydrologic Remote Sensing Center Snow Data Assimilation System (SNODAS) Products at NSIDC. NSIDC Special Report 11. Boulder, CO USA: National Snow and Ice Data Center. 19 pp.

Carroll, T., D. Cline, G. Fall, A. Nilsson, L. Li, and A. Rost. 2001. NOHRSC Operations and the Simulation of Snow Cover Properties for the Conterminous U.S. Proceedings of the 69th Annual Meeting of the Western Snow Conference, pp. 1-14.

Carroll, T. 2005. Overview of the Center's Web Site and Products . National Operational Hydrologic Remote Sensing Center, 15 pp.

Jordan, R. 1990. User's guide for USA-CRREL one-dimensional snow temperature model (SNTHERM.89). USA Cold Regions Research and Engineering Laboratory (CRREL), 18 pp.</Reference>
  <Summary>&lt;p class="newsdate"&gt;Notice: If you are having difficulties subsetting SNODAS data via Polaris, please contact &lt;a href="mailto:nsidc@nsidc.org"&gt;nsidc@nsidc.org&lt;/a&gt;.&lt;/p&gt;  This data set contains output from the NOAA National Weather Service's National Operational Hydrologic Remote Sensing Center (NOHRSC) SNOw Data Assimilation System (SNODAS). SNODAS is a modeling and data assimilation system developed by NOHRSC to provide the best possible estimates of snow cover and associated parameters to support hydrologic modeling and analysis. The aim of SNODAS is to provide a physically consistent framework to integrate snow data from satellite, airborne platforms, and ground stations with model estimates of snow cover (Carroll et al. 2001). SNODAS includes procedures to ingest and downscale output from the Numerical Weather Prediction (NWP) models, and to simulate snowcover using a physically based, spatially-distributed energy- and mass-balance snow model. SNODAS also includes procedures to assimilate satellite-derived, airborne, and ground-based observations of snow covered area and Snow Water Equivalent (SWE).

These data are not suitable for snow fall events or totals for specific regions. For snow fall data, please see the state climatology reports for a particular state. These are gridded data sets for the continental United States at 1 km spatial resolution and 24 hour temporal resolution. Data are stored in flat binary 16-bit signed integer big-endian format with header and metadata files, and are available from 1 October 2003 to present via FTP.</Summary>
  <Metadata_Name>CEOS IDN DIF</Metadata_Name>
  <Metadata_Version>9.7</Metadata_Version>
  <DIF_Creation_Date>2004-03-29</DIF_Creation_Date>
  <Last_DIF_Revision_Date>2013-03-07</Last_DIF_Revision_Date>
  <DIF_Revision_History> Added DOI</DIF_Revision_History>
</DIF>
