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Extended AVHRR Polar Pathfinder (APP-x)

Sample product image of NOAA CDR Extended AVHRR Polar Pathfinder (APP-x). It depicts mean surface albedo over the norther hemisphere during September 2014 at 1400 local standard time.

This dataset provides advanced scientific researchers a high quality Climate Data Record (CDR) of Extended, Advanced Very High Resolution Radiometer (AVHRR) Polar Pathfinder (APP-x).

This NOAA CDR of the Extended AVHRR Polar Pathfinder cryosphere contains several geophysical variables over the Arctic and Antarctic for the period 1982 - present.

Data Variables

-Surface Albedo
-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.

Principal Investigator: Jeffrey Key, University of Wisconsin

Cite dataset when used as a source. See the dataset's DOI landing page for citation details at doi:10.7289/V5MK69W6.

Note: Due to a known issue, AVHRR Polar Pathfinder (APP) and its extended version (APP-x) will not properly aggregate in time using software tools. For more details and an interim fix, see the associated Technical Note.