資料庫

Brief Description:

 The reanalysis project ERA-40 will cover the period from mid-1957 to 2001 including the earlier ECMWF reanalysis ERA-15, 1979-1993. The main objective is to promote the use of global analyses of the state of the atmosphere, land and surface conditions over the period. The three dimensional variational technique will be applied using the T159L60 version of the Integrated Forecasting System to produce the analyses every six hours. Analysis involves comprehensive use of satellite data, starting from the early Vertical Temperature Profile Radiometer data in 1972, then later including TOVS, SSM/I, ERS and ATOVS data. Cloud Motion Winds will be used from 1979 onwards. ERA-40 products will also revitalize the use of data from past field experiments such as the 1974 Atlantic Tropical Experiment of the Global Atmospheric Research Program, GATE, 1979 FGGE, 1982 Alpine Experiment, ALPEX and more recent 1992-1993 TOGA-COARE. Most of the older observations for ERA-40 have been made available by NCAR. ERA-40 will provide a new potential for studying longer term trends and fluctuations such as ENSO and QBO.

 

Temporal Coverage:

Monthly values for 1957/09 – 2002/08.
4-times daily values for 1957/09 – 2002/08.

Spatial Coverage:

2.5 degree latitude x 2.5 degree longitude global grid (73x144).
90.0N - 90.0S, 0.0E - 357.5E.

Levels:

23 Pressure levels (mb): 1000 925 850 775 700 600 500 400 300 250 200 150 100 70 50 30 20 10 7 5 3 2 1

Data Format:

GRIB

 

ERA40

Data variable and Path:

Variable:

Surface 2 metre dewpoint temperature 2 metre temperature 10 metre V wind component 10 metre U wind component Boundary layer height
Convective precipitation East-West surface stress Evaporation High cloud cover Ice surface temperature layer 4
Ice surface temperature layer 3 Ice surface temperature layer 2 Ice surface temperature layer 1 Latitudinal component of gravity wave stress Low cloud cover
Mean sea level pressure Mean wave direction Mean wave period Medium cloud cover Meridional component of gravity wave stress
North-South surface stress Runoff Sea-ice cover Significant wave height Snow depth
Snow evaporation Snowfall (convective + stratiform) Snowmelt Soil temperature level 1 Soil temperature level 2
Soil temperature level 4 Soil temperature level 3 Stratiform precipitation (Large-scale precipitation) Surface latent heat flux Surface net solar radiation, clear sky
Surface net thermal radiation, clear sky Surface sensible heat flux Surface solar radiation Surface solar radiation downwards Surface thermal radiation
Surface thermal radiation downwards Temperature of snow layer Top net solar radiation, clear sky Top net thermal radiation, clear sky Top solar radiation
Top thermal radiation Total cloud cove Total column ozone Total column water Total column water vapor
Total precipitation Volumetric soil water layer 4 Volumetric soil water layer 1 Volumetric soil water layer 2 Volumetric soil water layer 3
Pressure Divergence Geopotential Ozone mass mixing ratio Potential vorticity Relative humidity
Specific humidity Temperature U component of wind V component of wind Vorticity (relative)

Download:

Pressure level /archive/Reanalysis/ECMWF/40/PRS
Surface /archive/Reanalysis/ECMWF/40/SFC

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