Reanalysis datasets available from page
For more information and discussion of various atmospheric and oceanic reanalyses, see the "Reanalysis Intercomparison and Observations Wiki" at http://reanalyses.org
For references/citations please go to the Reanalyses.org/atmosphere/references wiki page for a current list.
Dataset Availability. More data may be available at the source.
| Dataset | Start Data | End Date | Climo Available |
|---|
| NCEP/NCAR Reanalysis | Jan 1948 | near present | 1981-2010 |
| NCEP/DOE Reanalysis II | Jan 1979 | Jun 2012 | 1981-2010 |
| 20CR | Jan 1871 | Dec 2010 | 1981-2010 |
NCEP/NCAR Reanalysis I 1948-present (NCEP R1 home page)
This reanalysis was the first of its kind for NOAA. NCEP used the same climate model that was initialized with a wide variety
of weather observations: ships, planes, RAOBS, station data, satellite observations and many more. By using the same model,
scientists can examine climate/weather statistics and dynamic processes without the complication that model changes can cause. The dataset is kept current using near real-time observations.
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NCEP produced a second version of their first reanalysis starting from the beginning of the major satellite era. More observations were added, assimilation errors were corrected and a better version of the model was used.
20th Century Reanalysis (V2) 1871-2010 (20CR Home page)
The 20th Century Reanalysis version 2 dataset contains global
weather conditions and their uncertainty in six hour intervals from the
year 1871 to 2010. Surface and sea level pressure observations are
combined with a short-term forecast from an ensemble of integrations
of an NCEP numerical weather prediction model using the recently
developed Ensemble Kalman Filter technique to produce an estimate
of the complete state of the atmosphere, and the uncertainty in
that estimate. Additional observations and a newer version of the
NCEP model that includes time-varying CO2 concentrations, solar
variability, and volcanic aerosols are used in version 2. The long
time range of this dataset allows scientists to examine better long
time scale climate processes such as the Pacific Decadal Oscillation
and the Atlantic Multidecadal Oscillation as well as looking at the
dynamics of historical climate and weather events. Verification
tests have shown that using only pressure creates reasonable
atmospheric fields up to the tropopause. Additional tests suggest
some correspondence with observed variations in the lower stratosphere.
