The tables in this page summarise the change of horizontal resolution of the various model components to be implemented at IFS cycle 41r2

Atmospheric model

 HRESENS
 Leg ALeg BLeg C
 
Current
Upgrade
Current
Upgrade
Current
Upgrade
Current
Upgrade
SpectralTL1279TCO1279TL639TCO639TL319TCO639TL319
TCO319
Gaussian gridN640O1280N320
O640
N160
O640
N160O320
Horizontal grid resolution
~16 km
~9 km
~32 km
~18 km
~64 km
~18 km
~64 km
~36 km
Dissemination (LL)
0.125
0.0625 (TBC)
0.25
0.125
0.5
0.125
0.5
0.25

Model Level
Vertical resolution

137137919191919191

 

  • There will be no change in the number and definition of the pressure levels.
  • There will be no change in the model level vertical resolution.
  • The horizontal resolution of the ENS re-forecasts will be increased to match that of ENS.
  • The horizontal resolution of the two ENS constant-resolution forecasts provided for calibration and validation purposes will be increased:

 

 ENS calibration / validation
High resolutionLow resolution
 
Current
Upgrade
Current
Upgrade
Spectral
TL639
TCO639
TL319
TCO319
Gaussian grid
N320
O640
N160
O320
Horizontal grid resolution
~32 km
~18 km
~64 km
~36 km

Model Level
Vertical resolution

91
91
91
91

 

 

Wave model

 

 HRESENS
Leg ALeg B / C
 
Current
Upgrade
Current
Upgrade
CurrentUpgrade
Latitudinal spacing of the native grid in degrees
0.25
0.125
0.5
0.25
0.5
0.5
Horizontal grid resolution of the native grid~28km~14km ~55km~28km~55km~55km
Dissemination (LL)
0.25
0.125
0.5
0.25
0.5
0.5
Frequencies
36
36
30
36
25
30
Directions
36
36
24
36
12
24

 

The configuration of the HRES stand-alone wave model (HRES-SAW) will be unchanged (0.1 latitudinal spacing, 11km native grid resolution and 0.125x0.125 dissemination)

 

 

Ocean model

No changes will be made to the resolution of the ocean model used in the monthly extension of the ENS to 46 days.

 

 

Summary for atmospheric component of HRES, ENS, 4DVar and EDA

 

The current cycle is in blue and the upgrade is in red.

Grid resolution
(km)		HRESENS4DVarEDA
Leg ALeg B1st 2nd3rdOuter1st 2nd
128       TL159TL159
100       TL191TL191
80   TL255TL255TL255   
64  TL319 TL319    
50     TL399TL399  
36  TCO319      
32 TL639       
18 TCO639    TCO639  
16TL1279        
9TCO1279