| Home > Products > Data Services > Archive > Ensemble > Perturbed Forecast > Pressure Level > |
EPS Pressure Level Perturbed
Forecast Data Sets
| Ensemble | ||||||||
|
| See Also | ||||||||||
|
| Related Ensemble Documents | |||||
|
|
This part includes a brief description and the order forms
of this specific Data Set.
Use
Data finder
to check the availability of the data that interest you. If you wish to have a
costing or to place a request for data you can use our
On-line costing
system.
Description:
- period supported - 1 May 1994 to current date;
-
each parameter at each level is stored as a field either 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.
The changes to this data set are as follows:
| 1 May 1994 | Internal data representation is in spherical harmonics with triangular truncation at wave number 63 (T63). Data consists of an ensemble of 32 daily 10 day forecasts from base time 1200 UTC Forecast steps available are 0 then 12 hourly to HH+240 (10 days) 5 pressure levels, 1000, 850, 700, 500 and 200 hPa Fields available are geopotential, temperature, vertical velocity, u- and v-components of horizontal wind, relative vorticity, divergence, specific humidity and relative humidity |
|
10 December 1996 |
Internal data representation is in spherical harmonics with triangular truncation at wave number 159 (T159). Specific humidity changed to being archived on an N80 Gaussian grid. The number of ensemble members increased to 50. |
|
13 January 2000 |
From this date geopotential and temperature are archived at levels 850 and 500 hPa for forecast steps 0 then 6 hourly to HH+240. All other fields and levels are still archived only every 12 hours. |
| 21 November 2000 | Internal data representation is in spherical harmonics with triangular truncation at wave number 255 (TL255). Specific humidity is archived on an N128 Gaussian grid from this date. |
| 25 March 2003 | Ensemble forecasts from base time 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. |
Order forms :
If you wish to make an order from this data set please download the following two Acrobat (PDF) files :| 1. Instructions and Standard Order forms (common for all data sets): |
24 KB |
| 2. Data Set Order form (to select data from this specific data set only) : |
 |
16.09.2008 |
 | © ECMWF |
