NOAA Physical Sciences Division 20th Century Reanalysis
Entry ID: NOAA_PSD_TWENTIETH_CENTURY_REANALYSIS

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Summary
Abstract: [Source: Twentieth Century Reanalysis (V1), NOAA PSD, http://www.esrl.noaa.gov/psd/data/gridded/data.20thC_Rean.html ]

The analysis is performed with the Ensemble Filter as described in Compo et al. (2006).Observations of surface pressure and sea level pressure from the International Surface Pressure Databank version1.1 and ICOADS version 2.4 were assimilated every six hours. The short-term forecast ensemble is generated in parallel from 56 9-hour integrations of a state-of-the-art atmospheric general circulation model, the atmospheric component of NCEP's operational Climate Forecast System model (Saha et al. 2006). Briefly, the model has a spatial resolution of nearly 200-km on an irregular Gaussian grid in the horizontal (corresponding to a spherical harmonic representation of model fields truncated at total wavenumber 62, T62). In the vertical, for efficiency, we have reduced the resolution from a finite differencing of 64 levels to 28 levels with no detrimental effects to the reanalysis quality. The model top is at 0.2 hPa. The model has a complete suite of physical parameterizations as described in Kanamitsu et al. 1991) with recent updates detailed in Moorthi et al. (2001). Additional updates to these parameterizations, specific to this version of the model, are described in Saha et al. and include revised solar radiation transfer, boundary layer vertical diffusion, cumulus convection,and gravity wave drag parameterizations. In addition, the cloud liquid water is a prognostic quantity with a simple cloud microphysics parameterization. The radiation interacts with a fractional cloud cover that is diagnostically determined by the predicted cloud liquid water. The specified boundary conditions needed to run the model in atmosphere-only mode are taken from the time-evolving sea surface temperature and sea ice fields of the HadISST1.1 dataset obtained courtesy of the United Kingdom Met Office Hadley Centre Rayner et al. 2003).

Related URL
Link: GET DATA
Description: 20th Century Reanalysis Daily Composites


Link: GET DATA
Description: 20th Century Reanalysis Monthly/Seasonal Composites


Link: GET DATA
Description: Access all 20th Century Reanalysis Plotting/Analysis Tools


Link: GET DATA
Description: GRIB data files are available from the NCAR Data Support Section.


Link: VIEW RELATED INFORMATION
Description: View data set home page


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: NOAA/OAR/ESRL/PSD
Dataset Title: 20th Century Reanalysis data
Dataset Release Place: Boulder, CO, USA
Dataset Publisher: NOAA/OAR/ESRL/PSD
Version: 1
Online Resource: http://www.esrl.noaa.gov/psd/data/gridded/data.20thC_Rean.html


Temporal Coverage
Start Date: 1908-01-01
Stop Date: 1958-12-31

Start Date: 1921-01-01
Stop Date: 1950-12-31


Location Keywords
GEOGRAPHIC REGION > GLOBAL
VERTICAL LOCATION > LAND SURFACE
VERTICAL LOCATION > SEA SURFACE
VERTICAL LOCATION > TROPOSPHERE


Data Resolution
Latitude Resolution: 2 Degree
Longitude Resolution: 2 Degree
Temporal Resolution: Monthly


Science Keywords
ATMOSPHERE >ALTITUDE >GEOPOTENTIAL HEIGHT    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >SEA LEVEL PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >ATMOSPHERIC PRESSURE MEASUREMENTS    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >POTENTIAL TEMPERATURE >SURFACE POTENTIAL TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >SURFACE AIR TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY >RELATIVE HUMIDITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY >SPECIFIC HUMIDITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS >ZONAL WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS >MERIDIONAL WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS >VECTOR WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS >ZONAL WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS >MERIDIONAL WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ENVIRONMENT


Project
ESIP >Earth Science Information Partners Program    [Information]


Quality
View "Opportunities for Improvement" for quality information:
http://www.esrl.noaa.gov/psd/data/gridded/20thC_Rean/opportunities....


Use Constraints
Please cite the data set creator if you use this data. Link for citation information:
http://www.esrl.noaa.gov/psd/data/gridded/data.20thC_Rean.html#cita...


Keywords
OMEGA
SURFACE OMEGA


Data Set Progress
COMPLETE


Originating Center
NOAA/OAR/ESRL PSD


Data Center
Physical Sciences Division, Earth System Research Laboratory, OAR, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: http://www.esrl.noaa.gov/psd/

Data Center Personnel
Name: ESRL/PSD DATA INQUIRIES
Email: esrl.psd.data at noaa.gov


Personnel
GIL COMPO
Role: TECHNICAL CONTACT
Email: compo at colorado.edu
Contact Address:
Research Scientist
CIRES University of Colorado


SCOTT A. RITZ
Role: DIF AUTHOR
Phone: 301-614-5126
Fax: 301-614-5268
Email: Scott.A.Ritz at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: Maryland
Postal Code: 20771
Country: USA


Publications/References

Creation and Review Dates
DIF Creation Date: 2009-07-20
Last DIF Revision Date: 2009-11-04

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