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Orbitographie (Ixion)

ERA40 Version imprimable
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ERA40
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Levels

Model levels

  • 60 levels

The ECMWF model uses a hybrid vertical coordinate that reduces smoothly from a terrain-following sigma coordinate in the lower troposphere to a pressure coordinate in the stratosphere.


To represent the vertical variation of the dependent variables Chap2_Discretization75.gif , Chap2_Discretization20.gif , Chap2_Discretization25.gif and Chap2_Discretization30.gif , the atmosphere is divided into Chap2_Discretization50.gif layers. These layers are defined by the pressures at the interfaces between them (the `half-levels'), and these pressures are given by

Chap2_Discretization56.gif (1)



for Chap2_Discretization61.gif . The Chap2_Discretization66.gif and Chap2_Discretization71.gif are constants whose values effectively define the vertical coordinate and Chap2_Discretization114.gif is the surface pressure field.


The values of the Chap2_Discretization5.gif and Chap2_Discretization15.gif for all Chap2_Discretization99.gif are given here to allow the reconstruction of the `full-level' pressure Chap2_Discretization104.gif associated with each model level (middle of layer) from Chap2_Discretization119.gif (Chap2_Discretization109.gif )by using equation (1) and the surface pressure field.

 

Pressure levels

  • 23 levels (in hPa) : 1, 2, 3, 5, 7, 10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 500, 600, 700, 775, 850, 925, 1000

The fields have been interpolated to standard pressure levels from the original model levels.  



Dernière mise à jour : ( 26-11-2010 )
 
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