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- What's the impact of the different 'lead times' on the forecast of the storm (i.e. starting from different dates)?
- What's the impact of resolution on the forecast of the storm: both for it's development and impact over areas worse hit in Europe?
- Reduce the timestep of the model - does this improve or worsen the forecast?
Reduce the gravity wave drag - how does this affect the forecast in the upper and lower levels?
Expand title How to change the code (click here to expand) Edit the source code to half the gravity wave drag coefficient
File: ifs/phys_ec/sugwd.F90, change:
Code Block Line 108: ! Revised gwd parameter values Line 109: GKDRAG =0.15_JPRB
to:
Code Block Line 108: ! Revised gwd parameter values Line 109: GKDRAG = 0.075_JPRB ! half GWD coefficient: 0.15_JPRB
Increase the precipitation auto conversion rate - what impact does this have?
Expand title How 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)
Change the surface transfer coefficient in the turbulence scheme
Expand Reduce the coefficient by 20%.
Alter surf/module/surfexcdriver_ctl_mod.F90 from :
Code Block line 671: DO JL=KIDIA,KFDIA line 672: IF (JTILE == IFRMAX(JL)) THEN line 673: PKHLEV(JL)=ZKHLEV(JL) line 674: ENDIF line 675: ENDDO
to:
Code Block line 671: DO JL=KIDIA,KFDIA line 672: IF (JTILE == IFRMAX(JL)) THEN line 673: PKHLEV(JL)=ZKHLEV(JL) line 674: ENDIF line 675: ! reduce surface transfer coeff by 20% in turbulence scheme line 676: ZCFMTI(JL,JTILE)=0.8_JPRB*ZCFMTI(JL,JTILE) line 677: ENDDO
Reduce (halve) the asymptotic mixing length scale (K)
Expand title How to change the model code (click here to expand) For this change, two files need to be edited:
Code Block title ifs/phys_ec/suvdf.F90 line 53: RLAM = 75.0_jprb !! 150._JPRB: reduce to 75m
and:
Code Block title ifs/phys_ec/vdfexcu.F90 ZKLEN = 75.0_jprb !! 150.0_JPRB ! asymptotic K length scale troposphere - Reduce to 75m
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