Kistler, R., E. Kalnay, W. Collins, S. Saha, G. White, J. Woollen,
M. Chelliah, W. Ebisuzaki, M. Kanamitsu, V. Kousky, H. van den Dool,
R. Jenne, and M. Fiorino, 2001: The NCEP-NCAR 50-Year Reanalysis:
Monthly Means CD-ROM and Documentation. Bull. Amer. Meteor. Soc.,
Kalnay, E., M. Kanamitsu, R. Kistler, W. Collins, D. Deaven, L.
Gandin, M. Iredell, S. Saha, G. White, J. Woollen, Y. Zhu, M.
Chelliah, W. Ebisuzaki, W. Higgins, J. Janowiak, K.C. Mo, C.
Ropelewski, J. Wang, A. Leetmaa, R. Reynolds, R. Jenne, and D.
Joseph, 1996: The NCEP/NCAR 40-year reanalysis project. Bull. Amer.
Meteor. Soc., 77, 437-471.
Products from NCEP/NCAR Reanalysis Project (NNRP or R1) are archived
in this dataset. The resolution of the global Reanalysis Model is
T62 (209 km) with 28 vertical sigma levels. Results are available at
6 hour intervals. Although the initial plan is to reanalyze the data
for a 40-year period (1957-1996), production has gone back to 1948
and going forward continuously. Future plans call for rerunning the
entire period as next generation models are ready.
There are over 80 different variables, (including geopotential
height, temperature, relative humidity, u- and v- wind components,
etc.) in several different coordinate systems, such as 17 pressure
level stack on 2.5 by 2.5 degree grids, 28 sigma level stack on 192
by 94 Gaussian grids, and 11 isentropic level stack on 2.5 by 2.5
degree grid. They are organized as different subgroups in the
archive. In addition to analyses, diagnostic terms (for example:
radiative heating, convective heating) and accumulative variables
(like precipitation rate) are present. The input observations are
archived with quality and usage flags in WMO BUFR format. Most of
the project outputs are stored in WMO GRIB format. Other files, such
as restart files and zonal statistics, are saved in IEEE format.
Some special periods are analyzed more than once to provide data for
special research studies. For example, a special run of 1979 was
made excluding most satellite inputs. This run could be used for
evaluating the impact of satellite data on the analysis. During the
TOGA COARE experiment period, special runs of reanalysis model
without experimental data are archived under the TOGA COARE
For details and problems, see NCEP/NCAR Reanalysis TOGA COARE
Monthly means are on line at ds090.2
[https://rda.ucar.edu/datasets/ds090.2/]. The R1 forecasts are in
ds090.1 [https://rda.ucar.edu/datasets/ds090.1/] dataset.