{
    "identifier": "gov.noaa.ncdc:C01580",
    "accessLevel": "public",
    "contactPoint": {
        "@type": "vcard:Contact",
        "fn": "Your contact point",
        "hasEmail": "mailto:[email protected]"
    },
    "programCode": [
        "010:000"
    ],
    "landingPage": "",
    "title": "NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder Extended (APP-X) Cryosphere, Version 2",
    "description": "NOAA Climate Data Record (CDR) of the eXtended AVHRR Polar Pathfinder (APP-X) cryosphere contains 19 geophysical variables over the Arctic and Antarctic for the period 1982 - present. All of them have undergone various degrees of validation, though not all are considered CDR quality. The variables are (those considered by the developers to be CDR-quality are identified with an asterisk): Surface temperature, all-sky, snow, ice, and land* Surface albedo, all-sky* Sea ice thickness* Surface type Cloud mask* Cloud particle thermodynamic phase Cloud optical depth Cloud particle effective radius Cloud temperature Cloud pressure Cloud type Downwelling shortwave radiation at the surface* Downwelling longwave radiation at the surface* Upwelling shortwave radiation at the surface* Upwelling longwave radiation at the surface* Upwelling shortwave radiation at the TOA* Upwelling longwave radiation at the TOA* Shortwave cloud radiative forcing at the surface Longwave cloud radiative forcing at the surface APP-x data products are mapped to a 25 km EASE grid at two local solar times: 04:00 and 14:00 for the Arctic, and 02:00 and 14:00 for the Antarctica. Using local solar time rather than standard UTC times provides better information on diurnal differences at all locations. The latest update to version 2 includes folding in the APP FCDR updates (updated calibration coefficients for AVHRR GAC visible channels) along with improved algorithms for the land mask, cloud mask, and ice thickness.",
    "language": "",
    "distribution": [
        {
            "@type": "dcat:Distribution",
            "mediaType": "application\/json",
            "accessURL": "https:\/\/www.ncei.noaa.gov\/metadata\/geoportal\/\/rest\/metadata\/item\/gov.noaa.ncdc%3AC01580"
        },
        {
            "@type": "dcat:Distribution",
            "mediaType": "text\/html",
            "accessURL": "https:\/\/www.ncei.noaa.gov\/metadata\/geoportal\/\/rest\/metadata\/item\/gov.noaa.ncdc%3AC01580\/html"
        },
        {
            "@type": "dcat:Distribution",
            "mediaType": "application\/xml",
            "accessURL": "https:\/\/www.ncei.noaa.gov\/metadata\/geoportal\/\/rest\/metadata\/item\/gov.noaa.ncdc%3AC01580\/xml"
        },
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            "@type": "dcat:Distribution",
            "mediaType": "application\/octet-stream",
            "accessURL": "https:\/\/www.ncei.noaa.gov\/pub\/data\/metadata\/images\/C00941_appx_surface_albedo.jpg"
        }
    ],
    "bureauCode": [
        "010:04"
    ],
    "modified": "2025-11-20T02:55:32.949Z",
    "publisher": {
        "@type": "org:Organization",
        "name": "Your Publisher"
    },
    "theme": "",
    "keyword": [
        "Earth Science > Cryosphere",
        "Oceanic - Surface - Sea Ice",
        "Atmospheric - Upper-air - Cloud Properties",
        "Terrestrial - Albedo",
        "Atmospheric - Surface - Surface Radiation Budget (including Solar Irradiance)",
        "Atmospheric - Surface - Air Temperature",
        "Oceanic - Surface - Sea-surface Temperature",
        "Geographic Region > Arctic",
        "Continent > Antarctica",
        "Vertical Location > Land Surface",
        "Vertical Location > Sea Surface",
        "NOAA Climate Data Record (CDR) Program",
        "NOAA OneStop Project",
        "AVHRR > Advanced Very High Resolution Radiometer",
        "NOAA POES > NOAA Polar Orbiting Environmental Satellites",
        "10 km - HTML Markup Was Removed",
        "Satellite",
        "DOC\/NOAA\/NESDIS\/NCDC > National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce",
        "DOC\/NOAA\/NESDIS\/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce",
        "climatologyMeteorologyAtmosphere"
    ]
}