ENS gaat tot 5 HPA. Zoek ook eens op informatie over ECMWF versie 4.0
ECMWF data are produced on model levels (hybrid pressure-sigma coordinates) and at the surface. ECMWF data are also interpolated to pressure levels and some datasets include data on isentropic levels and the PV=2PVU surface.
The atmosphere is divided into various numbers of levels depending on the application. ERA-40 and ERA-Interim use 60 levels with the model top at 0.1 hPa, The ensemble prediction system uses 62 levels with the top at 5 hPa and the high-resolution operational data assimilation and forecasting system uses 91 levels with the model top at 0.01 hPa. These so called "sigma-levels", which follow the earth's surface in the lower- and mid-troposphere, are used as vertical coordinates but are surfaces of constant pressure in the upper stratosphere and mesosphere. A smooth transition between these types of levels is ensured ( Untch et al, 1999). The vertical resolution (measured in geometric height) is highest in the planetary boundary layer and lowest in the stratosphere and lower mesosphere.
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