Changeset 15735
- Timestamp:
- 2022-03-03T20:02:46+01:00 (2 years ago)
- Location:
- NEMO/branches/UKMO/NEMO_4.0.4_ice_strength_EAP/src/ICE
- Files:
-
- 2 edited
-
icedyn_rdgrft.F90 (modified) (13 diffs)
-
icedyn_rhg_evp.F90 (modified) (4 diffs)
Legend:
- Unmodified
- Added
- Removed
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NEMO/branches/UKMO/NEMO_4.0.4_ice_strength_EAP/src/ICE/icedyn_rdgrft.F90
r15734 r15735 74 74 LOGICAL :: ln_redist_ufm ! uniform redistribution of ridged ice (Hibler, 1980) 75 75 LOGICAL :: ln_redist_exp ! exponential redistribution of ridged ice 76 REAL(wp) :: max_strength ! maximum strength cap 76 77 REAL(wp) :: rn_murdg ! gives e-folding scale of ridged ice (m^.5) for ln_redist_exp 77 78 REAL(wp) :: rn_csrdg ! fraction of shearing energy contributing to ridging … … 513 514 ! 2) Transfer function 514 515 !----------------------------------------------------------------- 516 ! If assuming ridged ice is uniformly distributed between hrmin and 517 ! hrmax (ln_redist_ufm): 518 ! 515 519 ! Compute max and min ridged ice thickness for each ridging category. 516 ! Assume ridged ice is uniformly distributed between hrmin and hrmax.517 520 ! 518 521 ! This parameterization is a modified version of Hibler (1980). … … 528 531 ! These modifications have the effect of reducing the ice strength 529 532 ! (relative to the Hibler formulation) when very thick ice is ridging. 533 ! 534 !----------------------------------------------------------------- 535 ! If assuming ridged ice ITD is a negative exponential 536 ! (ln_redist_exp) and following CICE implementation: 537 ! 538 ! g(h) ~ exp[-(h-hrmin)/hrexp], h >= hrmin 539 ! 540 ! where hrmin is the minimum thickness of ridging ice and 541 ! hrexp is the e-folding thickness. 542 ! 543 ! Here, assume as above that hrmin = min(2*hi, hi+maxraft). 544 ! That is, the minimum ridge thickness results from rafting, 545 ! unless the ice is thicker than maxraft. 546 ! 547 ! Also, assume that hrexp = mu_rdg*sqrt(hi). 548 ! The parameter mu_rdg is tuned to give e-folding scales mostly 549 ! in the range 2-4 m as observed by upward-looking sonar. 550 ! 551 ! Values of mu_rdg in the right column give ice strengths 552 ! roughly equal to values of Hstar in the left column 553 ! (within ~10 kN/m for typical ITDs): 554 ! 555 ! Hstar mu_rdg 556 ! 557 ! 25 3.0 558 ! 50 4.0 559 ! 75 5.0 560 ! 100 6.0 530 561 ! 531 562 ! zaksum = net area removed/ total area participating … … 792 823 ! Compute the fraction of ridged ice area and volume going to thickness category jl2 793 824 ! 794 IF ( ln_redist_ufm ) THEN ! Hibler 1980uniform formulation825 IF ( ln_redist_ufm ) THEN ! Hibler (1980) uniform formulation 795 826 ! 796 827 IF( hrmin(ji,jl1) <= hi_max(jl2) .AND. hrmax(ji,jl1) > hi_max(jl2-1) ) THEN … … 806 837 ENDIF 807 838 ! 808 ELSE IF ( ln_redist_exp ) THEN ! exponential formulation839 ELSE IF ( ln_redist_exp ) THEN ! Lipscomb et al. (2007) exponential formulation 809 840 ! 810 841 IF (jl2 < jpl) THEN … … 929 960 IF( ln_str_H79 ) THEN ! Ice strength => Hibler (1979) method ! 930 961 ! !--------------------------------------------------! 962 ! Recommend using ismooth = 1 (spatial smoothing) 931 963 strength(:,:) = rn_pstar * SUM( v_i(:,:,:), dim=3 ) * EXP( -rn_crhg * ( 1._wp - SUM( a_i(:,:,:), dim=3 ) ) ) 932 ! Recommend ismooth = 1933 964 ! !--------------------------------------------------! 934 965 ELSE IF( ln_str_R75 ) THEN ! Ice strength => Rothrock (1975) method ! 935 966 ! !--------------------------------------------------! 936 ! 937 967 ! Recommend using ismooth = 0 (no smoothing needed) 968 ! Initialise the strength field at each timestep 938 969 strength(:,:) = 0._wp 939 ! Recommend ismooth = 0 940 970 ! 941 971 !-------------------------------- 942 972 ! 0) Identify grid cells with ice … … 979 1009 IF ( apartf(ji,jl) > 0._wp ) THEN 980 1010 ! 981 IF ( ln_redist_ufm ) THEN ! Uniform distribution of ridged ice1011 IF ( ln_redist_ufm ) THEN ! Uniform redistribution of ridged ice 982 1012 h2rdg = (1._wp/3._wp) * (hrmax(ji,jl)**3._wp - hrmin(ji,jl)**3._wp) & 983 1013 / (hrmax(ji,jl) - hrmin(ji,jl)) 984 1014 ! 985 ELSE IF ( ln_redist_exp ) THEN ! Exponential distribution of ridged ice1015 ELSE IF ( ln_redist_exp ) THEN ! Exponential redistribution of ridged ice 986 1016 h2rdg = hrmin(ji,jl) * hrmin(ji,jl) & 987 1017 + 2._wp * hrmin(ji,jl) * hrexp(ji,jl) & … … 1004 1034 1005 1035 DO ji = 1, npti 1006 IF ( zaksum(ji) > epsi10 ) THEN ! Unclear why is this check should be needed? Occasional x10E-24...1036 IF ( zaksum(ji) > epsi10 ) THEN 1007 1037 strength_1d(ji) = rn_Cf * Cp * strength_pe_sum(ji) / zaksum(ji) 1008 1038 ELSE … … 1013 1043 1014 1044 ! Enforce a maximum for strength 1015 WHERE( strength_1d(:) > 2.0e5) ; strength_1d(:) = 2.0e5 1045 ! Richter-Menge and Elder (1998) estimate maximum in Beaufort Sea in wintertime of the order 150 kN/m 1046 WHERE( strength_1d(:) > max_strength ) ; strength_1d(:) = max_strength 1016 1047 END WHERE 1017 1048 … … 1035 1066 CASE( 0 ) !--- No smoothing 1036 1067 1037 CALL lbc_lnk( 'icedyn_rdgrft', strength, 'T', 1. )1068 CALL lbc_lnk( 'icedyn_rdgrft', strength, 'T', 1. ) 1038 1069 1039 1070 CASE( 1 ) !--- Spatial smoothing … … 1174 1205 INTEGER :: ios ! Local integer output status for namelist read 1175 1206 !! 1176 NAMELIST/namdyn_rdgrft/ ismooth, ln_str_H79, rn_pstar, & 1177 & ln_str_R75, rn_Cf, & 1178 & ln_redist_ufm, ln_redist_exp, rn_murdg, & 1207 NAMELIST/namdyn_rdgrft/ ismooth, ln_str_H79, rn_pstar, & 1208 & ln_str_R75, rn_Cf, & 1209 & ln_redist_ufm, ln_redist_exp, & 1210 & max_strength, rn_murdg, & 1179 1211 & rn_crhg, rn_csrdg, & 1180 1212 & ln_partf_lin, rn_gstar, & … … 1203 1235 WRITE(numout,*) ' ratio of ridging work to PE change in ridging rn_Cf = ', rn_Cf 1204 1236 WRITE(numout,*) ' smoothing the resistance to deformation (strength) ismooth = ', ismooth 1237 WRITE(numout,*) ' maximum strength cap max_strength = ', max_strength 1205 1238 WRITE(numout,*) ' uniform redistribution of ridged ice (Hibler, 1980) ln_redist_ufm = ', ln_redist_ufm 1206 1239 WRITE(numout,*) ' exponential redistribution of ridged ice ln_redist_exp = ', ln_redist_exp … … 1235 1268 ENDIF 1236 1269 ! 1237 !! Add check for ismooth too, =0, 1 or 2 1238 1270 IF ( ( ismooth .NE. 0 ) .AND. ( ismooth .NE. 1 ) .AND. (ismooth .NE. 2 ) ) THEN 1271 CALL ctl_stop( 'ice_dyn_rdgrft_init: ismooth must be one of 0 (no smoothing), 1 (spatial), or 2 (temporal)' ) 1272 ENDIF 1273 ! 1274 ! 1239 1275 IF( .NOT. ln_icethd ) THEN 1240 1276 rn_porordg = 0._wp -
NEMO/branches/UKMO/NEMO_4.0.4_ice_strength_EAP/src/ICE/icedyn_rhg_evp.F90
r15734 r15735 792 792 END DO 793 793 CALL lbc_lnk_multi( 'icedyn_rhg_evp', pshear_i, 'T', 1., pdivu_i, 'T', 1., pdelta_i, 'T', 1., zten_i, 'T', 1., & 794 & zs1 , 'T', 1., zs2 , 'T', 1., zs12 , 'F', 1. )794 & zs1 , 'T', 1., zs2 , 'T', 1., zs12 , 'F', 1., zshear, 'T', 1. ) 795 795 796 796 ! --- Store the stress tensor for the next time step --- ! … … 885 885 END DO 886 886 ! 887 CALL iom_put( 'sig1_pnorm' , zsig1_p(:,:) * zmsk00(:,:) )888 CALL iom_put( 'sig2_pnorm' , zsig2_p(:,:) * zmsk00(:,:) )887 IF( iom_use('sig1_pnorm') ) CALL iom_put( 'sig1_pnorm' , zsig1_p(:,:) * zmsk00(:,:) ) 888 IF( iom_use('sig2_pnorm') ) CALL iom_put( 'sig2_pnorm' , zsig2_p(:,:) * zmsk00(:,:) ) 889 889 890 890 DEALLOCATE( zsig1_p , zsig2_p , zsig_I, zsig_II ) … … 1009 1009 1010 1010 ! time 1011 it = ( kt - 1) * kitermax + kiter1011 it = ( kt - nit000 ) * kitermax + kiter 1012 1012 1013 1013 ! convergence … … 1029 1029 istatus = NF90_PUT_VAR( ncvgid, nvarid, (/zresm/), (/it/), (/1/) ) 1030 1030 ! close file 1031 IF( kt == nitend - nn_fsbc + 1 ) istatus = NF90_CLOSE(ncvgid)1031 IF( kt == nitend - nn_fsbc + 1 .AND. kiter == kitermax ) istatus = NF90_CLOSE(ncvgid) 1032 1032 ENDIF 1033 1033
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