資料庫

Brief Description:

 The analysis is performed with the Ensemble Filter as described in Compo et al. (2010) based on the method of Whitaker and Hamill (2002). Observations of surface pressure and sea level pressure from the International Surface Pressure Databank station component version 2 (Yin et al. 2008), ICOADS (Woodruff et al. 2009), and the International Best Track Archive for Climatic Stewardship (IBTrACS, Kruk et al. 2010) were assimilated every six hours. The surface pressure observations have been made available through international cooperation facilitated by the Atmospheric Circulation Reconstructions over the Earth (ACRE) initiative and working groups of the Global Climate Observing System and World Climate Research Programme. The short-term forecast ensemble is generated in parallel from 56 9-hour integrations of a state-of-the-art atmospheric general circulation model, a 2008 updated experimental version of 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, we use finite differencing of 28 levels. 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 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 2008 experimental version of the model used for the 20th Century Reanalysis also includes the radiativeeffects of historical time-varying CO2 concentrations, volcanic aerosol and solar variations using the longwave radiation model of Mlawer et al. (1997) and shortwave radiation model of Hou et al. (2002). 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 concentration fields of the HadISST1.1 dataset obtained courtesy of the United Kingdom Met Office Hadley Centre (Rayner et al. 2003).

 

Temporal Coverage:

Long-tern average values from 1981-2010.
Monthly average values for 1871/01/01 to 2011/12/31.
Daily average values for 1871/01/01 to 2011/12/31. (Analysis, Regular Grid)
Daily average means for 1871/01/01 to 2011/12/31, but the value are 3-hour forecasts and not analysis. (Gaussian)

Spatial Coverage:

2.0 degree latitude x 2.0 degree longitude global grid (180x91).
90N - 90.0S, 0.0E - 358.E.
T62 Gaussian grid (192x94).
88.542N-88.542S, 0E-358.125E

Levels:

pressure level and single level files. 24 pressure levels (hPa): 1000 , 950 , 900 , 850 , 800 , 750 , 700 , 650 , 600 , 550 , 500 , 450 , 400 , 350 , 300 , 250 , 200 , 150 , 100 , 70 , 50 , 30 , 20 , 10
Some variables have less: Omega, Relative humidity and Specific humidity (to 100mb).
Surface sigma level.
Subsurface levels (cm): 0, 10, 40, 100

Data Format:

NetCDF.

 

20th

Data variable and Path:

·   Daily

Mono level (Analysis)

/archive/Reanalysis/NCEP/20thC_V2/day/MonoLev/Analysis

Mono level (Forecast)

/archive/Reanalysis/NCEP/20thC_V2/day/MonoLev/Forecast

Sub Surface

/archive/Reanalysis/NCEP/20thC_V2/day/SUB_SFC

Pressure level

/archive/Reanalysis/NCEP/20thC_V2/day/PRS

 

·   Monthly and Long-Term

Mono level (Analysis)

/archive/Reanalysis/NCEP/20thC_V2/mon/MonoLev/Analysis

Mono level (Forecast)

/archive/Reanalysis/NCEP/20thC_V2/mon/MonoLev/Forecast

Sub Surface

/archive/Reanalysis/NCEP/20thC_V2/mon/SUB_SFC

Pressure level

/archive/Reanalysis/NCEP/20thC_V2/mon/PRS

 

Variable:

Mono Level

(Analysis)

Air Temperature

Convective Available Potential Energy

Convective Inhibition

Cloud Water Content

Geopotential Height

Omega(dp/dt)

Potential Temperature

Precipitable Water Content

Pressure

Mean Sea Level Pressure

Relative Humidity

Total Columnar Ozone

U-Wind

V-Wind

Wind Speed

Mono Level

(Forecast)

Air Temperature

Albedo

Convective Precipitation Rate

Cloud Work Function

Downward Longwave Radiation Flux

Downward Solar Radiation Flux

Ground Heat Flux

Planetary Boundary Layer Height

Ice Concentration

Ice Thickness

Latent Heat Net Flux

Potential Evaporation Rate

Precipitable Water Content

Precipitation Rate

Pressure

Water Runoff

Sensible Heat Net Flux

Specific Humidity

Snow Depth

Snow Cover

Soil Moisture Content

Storm Surface Runoff

Total Cloud Cover

Maximum Temperature

Minimum Temperature

Transpiration

Momentum Flux, U-component

Zonal Gravity Wave Stress

Upward Longwave Radiation Flux

Upward Shortwave Radiation Flux

U-wind

Momentum Flux, V-component

Meridional Gravity

Wave Stress

V-wind

Water Equiv. of Accum. Snow Depth

Pressure

Air Temperature

Geopotential Height

Omega

Relative Humidity

Specific Humidity

Zonal Wind

Meridional Wind

 

 

 

Subsurface

Liquid Volumetric Soil Moisture (non-frozen) Fraction

Volumetric Soil Moisture

Soil Temperature

 

 

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