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How to Cite Use of 20CR Data Acknowledgment (V3) Recreating the Great Blizzard of 1888 - A Case Study

Version V1 covers 1908-1958 Available from NCAR.

Version V2 covers 1871-2012 Available from PSL.

Version V2c covers 1851-2012 (experimental 2013-2014 extension) Available from PSL.

Version 3 covers 1836-2015 Available from PSL.

Additional support has been provided by the Global Climate Observing System and the World Climate Research Programme. The project has greatly benefited from international cooperation under the Atmospheric Circulation Reconstructions over the Earth ( ACRE) initiative, which undertakes and facilitates the recovery of historical instrumental surface terrestrial and marine global weather observations to underpin 4D weather reconstructions spanning the last 200 to 250 years. The most recent version of this reanalysis, V3, provides 8-times daily estimates of global tropospheric variability across 75 km grids, spanning 1836 to 2015 (with an experimental extension from 1806 to 1835.) There are three previous versions of the reanalysis: V1, V2, and V2c. These reanalyses assimilate only surface observations of synoptic pressure into NOAAвЂ™s Global Forecast System and prescribe sea surface temperature and sea ice distribution in order to estimate e.g., temperature, pressure, winds, moisture, solar radiation and clouds, from the surface to the top of the atmosphere throughout the 19th and 20th centuries.Дў0CR uses an ensemble filter data assimilation method which directly estimates the most likely state of the global atmosphere for each three-hour period, and also estimates uncertainty in that analysis. To expand the coverage of global gridded reanalyses, the 20th Century Reanalysis Project is an effort led by NOAA's Physical Sciences Laboratory (PSL) and CIRES at the University of Colorado, supported by the Department of Energy, to produce reanalysis datasets spanning the entire 20th century and much of the 19th century. But until recently, the earliest reanalyses began with the year 1948, leaving out many important 20th century climate events, such as the 1930вЂ™s Dust Bowl.

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.ДЇour-dimensional historic weather reconstructions, or reanalyses, provide a crucial instrument-based link between long paleoclimate reconstructions and climate model forecasts.