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Monthly Means Operational Pressure Level Analysis Data Sets
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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 - July 1985 to current date;
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fields are uninitialised analyses for 0000 UTC, 0600 UTC, 1200 UTC and 1800 UTC each day;
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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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July 1985 |
Internal data representation is in spherical harmonics with triangular truncation at wave number 106 (T106). 14 standard pressure levels, 1000, 850, 700, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30 and 10 hPa Fields available: geopotential, temperature, vertical velocity, u- and v-components of horizontal wind, relative vorticity, divergence, specific humidity and relative humidity |
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October 1991 |
Internal data representation is in spherical harmonics with triangular truncation at wave number 213 (T213). |
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January 1992 |
Added pressure level, 925 hPa |
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April 1995 |
Specific humidity archived on a Gaussian grid (N160) from this date |
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April 1998 |
Internal data representation is in spherical harmonics with triangular truncation at wave number 319 (T319). |
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March 1999 |
Added pressure levels 20, 7, 5, 3, 2, 1 hPa |
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September 2000 |
Added ozone mass mixing ratio; this field is archived on a Gaussian grid. |
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December 2000 |
Internal data representation is in spherical harmonics with triangular truncation at wave number 511 (T511). Gaussian fields are represented on an N256 grid. |
| February 2006 | Internal data representation is in spherical harmonics with triangular truncation at wave number 799 (T799). Gaussian fields are represented on an N400 grid. |
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) : |
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26.01.2006 |
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