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EPS Pressure Level Control
Forecast Data Sets
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Ordering
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This part includes a brief description and the order forms
of this specific Data Set.
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Description:
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period supported - 1 May 1994 to current date;
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each parameter at each level is stored as a field either of grid point values or of spherical harmonic coefficients;
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spherical harmonic coefficients are stored as defined by code figure 1 in tables 9 and 10 of FM 92-IX Ext GRIB;
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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.
The changes to this data set are as follows:
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1 May 1994 |
Internal data representation is in spherical harmonics with triangular truncation at wave number 63 (T63). Data consist of daily 10 day forecasts from base time 1200 UTC. Forecast steps available are 0, 3, 6, 9 and 12, then 6 hourly to HH+120 then 12 hourly to HH+240. 15 standard pressure levels: 1000, 925, 850, 700, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30 and 10 hPa. Fields available are geopotential, temperature, vertical velocity, u- and v-components of horizontal wind, relative vorticity, divergence, specific humidity and relative humidity |
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10 December 1996 |
Internal data representation is in spherical harmonics with triangular truncation at wave number 159 (TL159). Specific humidity changed to being archived on an N80 Gaussian grid from this date. |
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31 July 1997 |
Forecast steps available are 0, 3, 6, 9 and 12, then 6 hourly to HH+120 then 12 hourly to HH+504 (21 days) |
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9 June 1999 |
Forecast steps available are 0, 3, 6, 9 and 12, then 6 hourly to HH+240 then 12 hourly to HH+504 (21 days) |
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21 November 2000 |
Internal data representation is in spherical harmonics with triangular truncation at wave number 255 (TL255). Gaussian fields are archived on an N128 Gaussian grid from this date. |
| 12 June 2001 | Field added: potential vorticity which is archived on a Gaussian grid. |
| 25 March 2003 |
21 day forecasts from base 0000 UTC are available. |
| 1 February 2006 | Internal data representation is in spherical harmonics with triangular truncation at wave number 399 (T399). Gaussian fields are archived on an N200 Gaussian grid from this date. |
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16.09.2008 |
 | © ECMWF |
