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ECMWF 40 Year Re-analysis (ERA-40) Full Resolution Model Level Analysis Data Set

ERA-40 Full Resolution

Surface analysis

Pressure level analysis

Model level analysis

Isentropic level analysis

Potential vorticity level analysis

Surface daily forecast

Pressure level daily forecast

Model level daily forecast

Description:

fields are analyses for 0000, 0600, 1200 and 1800 UTC each day;
60 hybrid model levels;
each value at each level is stored as a field of grid point values or of spherical harmonic coefficients;
spherical harmonic coefficients are stored as defined by code figure 1 in tables 9 and 10 of FM 92-IX Ext GRIB;
data are stored in FM 92 GRIB using sufficient bits to ensure that the values represented can be retrieved to an accuracy consistent with the analysis method used;
Internal data are represented as spherical harmonics with triangular truncation at wave number 159 (TL159) or as Gaussian data on a Quasi-regular N80 Gaussian grid;

Fields available are:

ln surface pressure, orography (geopotential) on level 1 only plus cloud cover, cloud ice water content, cloud liquid water content, divergence, ozone mass mixing ratio, specific humidity, temperature, u- and v-components of horizontal wind, vertical velocity, vorticity (relative) at all levels;

cloud cover, cloud ice water content, cloud liquid water content, ozone mass mixing ratio and specific humidity are archived as gaussian fields with the rest archived as spherical harmonics;

orography is an invariant field.

25.08.2011