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<gco:CharacterString>Enhanced NASA Team 2 (NT2) sea ice concentrations are calculated using the individual Level-2A TB's. The primary source of error is attributed to conditions in the surface layer such as surface glaze and layering, which can significantly affect the horizontally polarized 18.7 GHz TB, leading to an underestimation of sea ice concentration. The NT2 algorithm uses the 89 GHz channels because the horizontally polarized 89 GHz data are less affected by surface conditions than the horizontally polarized 18.7 GHz data, and the 89 GHz channels have successfully been used in sea ice concentration retrievals under clear atmospheric conditions. As a result, this algorithm can identify more complex ice types resulting from surface glaze and layering in the snow cover. The thin-ice bias is then reduced.</gco:CharacterString>
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</gmi:LE_Algorithm>
</gmi:algorithm>
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<gmi:citation>
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<gmd:title>
<gco:CharacterString>Bootstrap Basic Algorithm (BBA)</gco:CharacterString>
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<gmd:CI_Date>
<gmd:date>
<gco:Date>2013-11-12</gco:Date>
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<gco:CharacterString>20131112</gco:CharacterString>
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<gco:CharacterString>Josefino Comiso</gco:CharacterString>
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<gco:CharacterString>NASA / GSFC Cryospheric Sciences Laboratory</gco:CharacterString>
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<gmd:CI_Contact>
<gmd:address>
<gmd:CI_Address>
<gmd:electronicMailAddress>
<gco:CharacterString>josefino.c.comiso@nasa.gov</gco:CharacterString>
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<gmi:description>
<gco:CharacterString>The Bootstrap Basic Algorithm (BBA) uses two sets of channels to identify consolidated ice and open water: 18.7V GHz and 37V GHz, and 37H GHz and 37V GHz. Using these channels for the retrieval of sea ice concentration ensures consistency with historical sea ice products, beginning with SMMR.</gco:CharacterString>
</gmi:description>
</gmi:LE_Algorithm>
</gmi:algorithm>
<gmi:algorithm>
<gmi:LE_Algorithm>
<gmi:citation>
<gmd:CI_Citation>
<gmd:title>
<gco:CharacterString>Snow Depth on Sea Ice</gco:CharacterString>
</gmd:title>
<gmd:date>
<gmd:CI_Date>
<gmd:date>
<gco:Date>2013-11-12</gco:Date>
</gmd:date>
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<gmd:CI_DateTypeCode codeList=\"http://standards.iso.org/iso/19139/resources/codelist/gmxCodelists.xml#CI_DateTypeCode\" codeListValue=\"lastUpdate\">lastUpdate</gmd:CI_DateTypeCode>
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<gco:CharacterString>20131112</gco:CharacterString>
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<gmd:citedResponsibleParty>
<gmd:CI_ResponsibleParty>
<gmd:individualName>
<gco:CharacterString>Dr. Thorsten Markus</gco:CharacterString>
</gmd:individualName>
<gmd:organisationName>
<gco:CharacterString>NASA / GSFC Cryospheric Sciences Laboratory</gco:CharacterString>
</gmd:organisationName>
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<gmd:address>
<gmd:CI_Address>
<gmd:electronicMailAddress>
<gco:CharacterString>thorsten.markus@nasa.gov</gco:CharacterString>
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<gmd:CI_RoleCode codeList=\"http://standards.iso.org/iso/19139/resources/codelist/gmxCodelists.xml#CI_RoleCode\" codeListValue=\"author\">author</gmd:CI_RoleCode>
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</gmd:CI_ResponsibleParty>
</gmd:citedResponsibleParty>
<gmd:citedResponsibleParty>
<gmd:CI_ResponsibleParty>
<gmd:individualName>
<gco:CharacterString>Dr. Donald Cavalieri</gco:CharacterString>
</gmd:individualName>
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<gco:CharacterString>NASA / GSFC Cryospheric Sciences Laboratory</gco:CharacterString>
</gmd:organisationName>
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<gmd:address>
<gmd:CI_Address>
<gmd:electronicMailAddress>
<gco:CharacterString>donald.j.cavalieri@nasa.gov</gco:CharacterString>
</gmd:electronicMailAddress>
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</gmd:address>
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</gmd:CI_Citation>
</gmi:citation>
<gmi:description>
<gco:CharacterString>Snow depth on sea ice is a 5-day running average of the current day and the previous four days. This algorithm is only valid over seasonal ice. The snow depth on sea ice is calculated using a spectral gradient ratio of the 18.7 GHz and 36.5 GHz vertical polarization channels. The algorithm uses 2 masks: a multiyear sea ice mask updated daily by the NT2 algorithm and a running 5-day snow melt mask corresponding to the snow depth on ice product.</gco:CharacterString>
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<gco:CharacterString>The AMSR-E/Aqua Level 3 12.5 km daily sea ice product includes 18.7 - 89.0 GHz TBs, sea ice concentration averages, and 5-day snow depth over sea ice on a 12.5 km polar stereographic grid, generated by the NT2 algorithm using Level-2A TBs. This validated version includes an updated Southern Hemisphere sea ice mask derived from National Ice Center data (June 2011) and updated flags correlating with the new mask.</gco:CharacterString>
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<gmd:CI_Citation>
<gmd:title>
<gco:CharacterString>AMSR-E/Aqua Daily L3 12.5 km Tb, Sea Ice Conc., &amp; Snow Depth Polar Grids</gco:CharacterString>
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<gmd:date gco:nilReason=\"inapplicable\"/>
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<gmx:Anchor xlink:actuate=\"onRequest\" xlink:title=\"Digital Object Identifier (DOI)\" xlink:href=\"http://dx.doi.org/10.5067/AMSR-E/AE_SI12.003\">doi:10.5067/AMSR-E/AE_SI12.003</gmx:Anchor>
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<gco:CharacterString>gov.nasa.esdis</gco:CharacterString>
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<gco:CharacterString>Digital Object Identifier (DOI)</gco:CharacterString>
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";
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        String DOI "10.5067/AMSR-E/AE_L2A.003
10.5067/AMSR-E/AE_SI12.003";
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    date_NONEOS {
        String long_name "date";
    }
    initialization_year_NONEOS {
        String long_name "initialization year";
    }
    multiyear_mask_NONEOS {
        String long_name "multiyear mask";
    }
    variability_5day_NONEOS {
        String long_name "variability 5day";
    }
}