20th Century Reanalysis: NOAA Physical Sciences Laboratory
About. Using a state-of-the-art data assimilation system and surface pressure observations, the NOAA-CIRES-DOE Twentieth Century Reanalysis (20CR) project has generated a four-dimensional global atmospheric dataset of weather spanning 1836 to 2015 to place current atmospheric circulation patterns into a historical perspective.. 20th Century Reanalysis and PSL
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