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  • Increase the precipitation auto conversion rate - what impact does this have?

    Expand
    titleHow to change the code (click here to expand…)

    Edit the source code to increase the auto conversion rate by 20%

    File: ifs/phys_ec/sucldp.F90, change:

    Code Block
    line 123: RKCONV=1._JPRB/6000._JPRB   ! 1/autoconversion time scale (s)

    to:

    Code Block
    line 123: ! RKCONV=1._JPRB/6000._JPRB   ! 1/autoconversion time scale (s)
line 124: RKCONV=1.2_JPRB/6000._JPRB    ! default scaled by 20%: 1/autoconversion time scale (s)

  • Impact of the improved diurnal cycle of convection.  The improved diurnal cycle can be switched on and off in the model using the model namelists.
    In this sensitivity experiment, look at the timing of convective and precipitation events by changing how the model parametrizes the diurnal cycle.

    Expand
    titleHow to change the representation of diurnal convection (click here to expand...)

    OpenIFS has 3 options for the controlling the diurnal cycle. To change between them:

    - Edit the fort.4 file

    - Find the namelist NAMCUMF and change the parameter RCAPDCYCL accordingly:

    Info

     

    Namelist block NAMCUMF, parameter RCAPDCYCL

    RCAPDCYCL = 2 (default) activates the diurnal cycle using sub-cloud CAPE,

    RCAPDCYCL = 1 diurnal cycle using surface sensible heat flux,

    RCAPDCYCL = 0 reverts the code to a setting before the diurnal cycle for convection was

    implemented.

 

Optimization factor for the time scale adjustment:

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