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| Definition | The temperature near the surface to which a given air parcel must be cooled at constant pressure and constant water vapor content in order for saturation to occur. |
| Validity | Daily mean |
| Comment | Computed fronm from instantaneous values at 00, 06, 12 and 18Z. Please note that the specific height level above ground might vary from one Centre to another. The scaled value of first fixed surface given below is the one in usage at ECMWF. |
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