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NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder Extended (APP-X) Cryosphere, Version 2

Published by DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: April 12, 2026 at 09:24 PM | Dataset Last Updated: January 01, 2019 at 12:00 AM
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.

Resources

16 resources available

  • NCEI Dataset Landing Page

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  • NOAA CDR Page

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  • NCEI Direct Download

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  • NCEI THREDDS Catalog

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  • Registry of Open Data on AWS

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  • AWS S3 Explorer (Region: us-east-1)

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  • Azure Landing Page (Region: us-east)

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  • Journal of Climate Article

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  • Remote Sensing of Environment Article

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  • Journal of Geophysical Research Article

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  • Journal of Applied Meteorology and Climatology Article

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  • Journal of Geophysical Research Article

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  • NCEI landing page for the APP CDR

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  • Global Change Master Directory (GCMD) Keywords

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  • GCOS Essential Climate Variables

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  • CDR Program Contacts

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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

Complete Metadata
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accessLevel non-public
accrualPeriodicity R/P1D
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describedByType application/octet-steam
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.
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identifier https://data.noaa.gov/waf/NOAA/NESDIS/ncei/aim/iso/xml/C01580.xml
issued 2019-01-01T00:00:00.000+00:00
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 - < 50 km or approximately .09 degree - < .5 degree",
  "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"
]
language 
[]
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2019-01-01T00:00:00.000+00:00
publisher 
{
  "name": "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce",
  "@type": "org:Organization"
}
references 
[
  "https://doi.org/10.1175/JCLI3438.1",
  "https://doi.org/10.1016/S0034-4257(97)89497-7",
  "https://doi.org/10.1029/JD094iD15p18521",
  "https://doi.org/10.1175/1520-0450-39.10.1797",
  "https://doi.org/10.1029/2009JC005857",
  "https://doi.org/10.25921/X2X1-JR34"
]
rights otherRestrictions
spatial 180.0,-90.0,-180.0,90.0
temporal 1982-01-01T00:00:00+00:00/1982-01-01T00:00:00+00:00
title NOAA Climate Data Record (CDR) of AVHRR Polar Pathfinder Extended (APP-X) Cryosphere, Version 2

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