資料庫

Brief Description:

 The NCEP/NCAR Reanalysis 1 project is using a state-of-the-art analysis/forecast system to perform data assimilation using past data from 1948 to the present. A large subset of this data is available from PSD in its original 4 times daily format and as daily averages. However, the data from 1948-1957 is a little different, in the regular (non-Gaussian) gridded data. That data was done at 8 times daily in the model, because the inputs available in that era were available at 3Z, 9Z, 15Z, and 21Z, whereas the 4x daily data has been available at 0Z, 6Z, 12Z, and 18Z. These latter times were forecasted and the combined result for this early era is 8x daily. The local ingestion process took only the 0Z, 6Z, 12Z, and 18Z forecasted values, and thus only those were used to make the daily time series and monthly means here.

 

Temporal Coverage:

4-times daily values for 1948/01/01 to 2016/08/26, daily values for 1948/01/01 to 2017/08/27, monthly values for 1949/01/01 to 2017/07/31

Spatial Coverage:

2.5 degree x 2.5 degree global grids (144x73)
0.0E to 357.5E, 90.0N to 90.0S

Levels:

17 Pressure levels (mb): 1000,925,850,700,600,500,400,300,250,200,150,100,70,50,30,20,10
Surface sigma levels.
Some variables have less: omega (to 100mb) and Humidities (to 300mb).

Data Format:

GRIB.

 

NCEP NCAR Reanalysis1

Data variable and Path:

Variable:

Pressure Pressure Geopotential height Temperature Virtual temperature Zonal/Meridional wind
Pressure vertical velocity Absolute vorticity Relative vorticity Relative divergence Relative humidity
Specific humidity Precipitable water Surface lifted index Best (4-layer) lifted index Vertical speed shear
Stream function Velocity potential Covariance u and omega Covariance v and omega Covariance u and specific hum.
Covariance v and specific hum. Covariance T and omega Covariance specific hum. and omega Covariance v and u Covariance u and T
Covariance v and T        
Surface Pressure Temperature Zonal/Meridional wind Specific humidity Precipitable water
Precipitation rate Snowfall rate water equiv. Accum. snow Total cloud cover Convective cloud cover
Land-sea mask Surface roughness Runoff Ice concentration Net short/long wave (surface)
Latent heat flux Sensible heat flux Zonal/Meridional momentum flux Volumetric soil moisture Potential evaporation rate
Cloud work function Zonal/Meridional gravity wave stress Ground heat flux Clear sky upward solar flux Clear sky downward solar flux
Clear sky upward long wave flux Clear sky downward long wave flux Cloud forcing net solar flux Cloud forcing net long wave flux Visible beam downward solar flux
Near IR beam downward solar flux Near IR diffuse downward solar flux Model layer number (from bottom up) Downward solar radiation flux Downward long wave flux
Upward solar radiation flux Upward long wave flux Convective precip. rate RH-type cloud cover Snow melt heat flux
Snow sublimation heat flux 10M Zonal/Meridional wind 2M Specific humidity 2M Temperature Precipitation
Surface solar radiation downward Surface solar radiation upward Surface thermal radiation downward Surface thermal radiation upward Top Shortwave radiation upward
Top Shortwave radiation downward Top thermal radiation upward      

Download:

Monthly and 6-hourly

Pressure level /archive/Reanalysis/NCEP/R1/PRS
Surface /archive/Reanalysis/NCEP/R1/SFC
Surface flux /archive/Reanalysis/NCEP/R1/SFC_flux

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