NCEP Twice Daily Global Analysis
Entry ID: noaa_cdc024

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Summary
Abstract: NCEP prepares a twice-daily global analysis at 2.5 degrees resolution
on pressure levels as a product of their operational forecast
system. The original data set as stored at the National Center for
Atmospheric Research (NCAR) starts in July 1976 and is being updated
continuously at NCAR. We make a subset of this data available
beginning in 1979. We also make available selected monthly mean
datasets that go back in time (for the northern hemisphere). As part
of a research project supported by the National Science Foundation,
the NCEP data has been processed by NCAR into a convenient format for
climatological studies. Some quality control and error-checking are
done at this time. CDC has processed the twice-daily data by linearly
interpolating to fill in missing values and then creating a daily
average from the twice daily data. The data set provided is the (00Z
+ 12Z)/2. (i.e., analyzed) data. In the analysis process, the
observations are interpolated to a grid. Because (1) large parts of
the world (and many levels) have no observations and (2) the data are
not taken at one time (data is included if it is within 6 hours of the
forecast time), a model forecast is used to help with the
interpolation. Therefore, technically speaking, the data provided is
an analyzed data set, which is a blend of observational and model
data. These analyses are then INITIALIZED.
NOAAServer Codes: [POL 90 -90 180 -180] ; nodateline preview obtain

Supplemental Information:


Purpose: Scientific research.

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

Data Set Citation
Dataset Originator/Creator: NOAA-CIRES Climate Diagnostics Center
Dataset Title: NCEP Twice Daily Global Analysis
Dataset Release Date: 1993-10-31
Dataset Release Place: Boulder, CO
Dataset Publisher: NOAA-CIRES Climate Diagnostics Center
Online Resource: http://www.cdc.noaa.gov/cdc/data.nmc.html


Temporal Coverage
Start Date: 1985-01-01
Stop Date: 1993-10-31


Location Keywords
GEOGRAPHIC REGION > GLOBAL


Science Keywords
ATMOSPHERE >ALTITUDE >GEOPOTENTIAL HEIGHT    [Definition]
ATMOSPHERE >ATMOSPHERIC PRESSURE >SEA LEVEL PRESSURE    [Definition]
ATMOSPHERE >ATMOSPHERIC TEMPERATURE >AIR TEMPERATURE    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >HUMIDITY    [Definition]
ATMOSPHERE >ATMOSPHERIC WATER VAPOR >WATER VAPOR    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Access Constraints
None.


Use Constraints
None. Acknowledgement of CDC would appreciated in products derived
from these data.


Keywords
NCEP Twice Daily [POL 90.00 -90.00 180 -180]
Air Temperature
Geopotential Height
Relative humidity
Sea Level Pressure
U-wind
V-wind


Data Set Progress
COMPLETE


Data Center
Climate Analysis Branch, Physical Sciences Division, Earth System Research Laboratory, OAR, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: http://www.esrl.noaa.gov/psd/psd1/
Dataset ID: CDC024

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


Personnel
ESRL/PSD DATA INQUIRIES
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Email: esrl.psd.data at noaa.gov



Creation and Review Dates
DIF Creation Date: 2002-03-11
Last DIF Revision Date: 2009-07-06

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