| 1 |
jmc |
1.3 |
C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_extend.F,v 1.2 2004/12/17 03:44:52 jmc Exp $ |
| 2 |
jmc |
1.1 |
C $Name: $ |
| 3 |
|
|
|
| 4 |
|
|
#include "THSICE_OPTIONS.h" |
| 5 |
|
|
|
| 6 |
|
|
CBOP |
| 7 |
|
|
C !ROUTINE: THSICE_EXTEND |
| 8 |
|
|
C !INTERFACE: |
| 9 |
|
|
SUBROUTINE THSICE_EXTEND( |
| 10 |
|
|
I esurp, Tf, |
| 11 |
|
|
U sst, compact, iceThick, snowThick, qicen, |
| 12 |
|
|
O qleft, fresh, fsalt, |
| 13 |
|
|
I dBugFlag, myThid ) |
| 14 |
|
|
C !DESCRIPTION: \bv |
| 15 |
|
|
C *==========================================================* |
| 16 |
|
|
C | S/R THSICE_EXTEND |
| 17 |
|
|
C | o Extend sea-ice area incresing ice fraction |
| 18 |
|
|
C *==========================================================* |
| 19 |
|
|
C | o incorporate surplus of energy to |
| 20 |
|
|
C | make new ice or make ice grow laterally |
| 21 |
|
|
C *==========================================================* |
| 22 |
|
|
C \ev |
| 23 |
|
|
|
| 24 |
|
|
C !USES: |
| 25 |
|
|
IMPLICIT NONE |
| 26 |
|
|
|
| 27 |
|
|
C == Global variables == |
| 28 |
jmc |
1.2 |
#include "EEPARAMS.h" |
| 29 |
jmc |
1.1 |
#include "THSICE_SIZE.h" |
| 30 |
|
|
#include "THSICE_PARAMS.h" |
| 31 |
|
|
|
| 32 |
|
|
C !INPUT/OUTPUT PARAMETERS: |
| 33 |
|
|
C == Routine Arguments == |
| 34 |
|
|
C esurp :: energy available for freezing [W/m2] |
| 35 |
|
|
C Tf :: freezing temperature [oC] |
| 36 |
|
|
C sst :: Sea Surf Temp. [oC] |
| 37 |
|
|
C compact :: fraction of grid area covered in ice |
| 38 |
|
|
C iceThick :: ice height [m] |
| 39 |
|
|
C snowThick:: snow height [m] |
| 40 |
jmc |
1.3 |
C qicen :: ice enthalpy [J/kg] |
| 41 |
jmc |
1.1 |
C qleft :: (additional) heat flux to ocean [W/m2] |
| 42 |
|
|
C fsalt :: (additional) salt flux to ocean [ g/m2/s] |
| 43 |
|
|
C fresh :: (additional) fresh water flux to ocean [kg/m2/s] |
| 44 |
|
|
C dBugFlag :: allow to print debugging stuff (e.g. on 1 grid point). |
| 45 |
|
|
C myThid :: thread number for this instance of the routine. |
| 46 |
|
|
_RL esurp |
| 47 |
|
|
_RL Tf |
| 48 |
|
|
_RL sst |
| 49 |
|
|
_RL compact |
| 50 |
|
|
_RL iceThick |
| 51 |
|
|
_RL snowThick |
| 52 |
|
|
_RL qicen(nlyr) |
| 53 |
|
|
_RL qleft |
| 54 |
|
|
_RL fresh |
| 55 |
|
|
_RL fsalt |
| 56 |
|
|
LOGICAL dBugFlag |
| 57 |
|
|
INTEGER myThid |
| 58 |
|
|
CEOP |
| 59 |
|
|
|
| 60 |
|
|
#ifdef ALLOW_THSICE |
| 61 |
|
|
|
| 62 |
|
|
C !LOCAL VARIABLES: |
| 63 |
|
|
C == Local variables == |
| 64 |
jmc |
1.3 |
C qicAv :: mean enthalpy of ice (layer 1 & 2) [J/m^3] |
| 65 |
jmc |
1.1 |
_RL deltaTice ! time-step for ice model |
| 66 |
|
|
_RL newIce |
| 67 |
|
|
_RL newIceFrac |
| 68 |
|
|
_RL iceFraction |
| 69 |
|
|
_RL qicAv |
| 70 |
|
|
LOGICAL dBug |
| 71 |
|
|
|
| 72 |
|
|
1010 FORMAT(A,I3,3F8.3) |
| 73 |
|
|
1020 FORMAT(A,1P4E11.3) |
| 74 |
|
|
dBug = .FALSE. |
| 75 |
|
|
c dBug = dBugFlag |
| 76 |
|
|
|
| 77 |
|
|
C-- start ice |
| 78 |
|
|
deltaTice = thSIce_deltaT |
| 79 |
|
|
iceFraction = compact |
| 80 |
|
|
newIceFrac = 0. _d 0 |
| 81 |
|
|
|
| 82 |
|
|
C- enthalpy of new ice to form : |
| 83 |
|
|
IF ( compact.LE.0. _d 0 ) THEN |
| 84 |
|
|
qicen(1)= -cpwater*Tmlt1 |
| 85 |
|
|
& + cpice *(Tmlt1-Tf) + Lfresh*(1. _d 0-Tmlt1/Tf) |
| 86 |
|
|
qicen(2)= -cpice *Tf + Lfresh |
| 87 |
|
|
ENDIF |
| 88 |
|
|
qicAv = rhoi*(qicen(1)+qicen(2))*0.5 _d 0 |
| 89 |
|
|
newIce = esurp*deltaTice/qicAv |
| 90 |
|
|
|
| 91 |
|
|
IF (iceFraction.EQ.0. _d 0) THEN |
| 92 |
|
|
c IF (newIce.GE.himin*iceMaskmax) THEN |
| 93 |
|
|
C- jmc: above is the original version, but below seems more logical: |
| 94 |
|
|
IF (newIce.GE.himin0*iceMaskmin) THEN |
| 95 |
|
|
C- if there is no ice in grid and enough ice to form: |
| 96 |
|
|
iceThick = MAX(himin0,newIce/iceMaskmax) |
| 97 |
|
|
newIceFrac = MIN(newIce/himin0,iceMaskmax) |
| 98 |
|
|
compact = newIceFrac |
| 99 |
|
|
sst=Tf |
| 100 |
|
|
ENDIF |
| 101 |
|
|
ELSE |
| 102 |
|
|
C- if there is already some ice |
| 103 |
|
|
newIceFrac=MIN(newIce/iceThick,iceMaskmax-iceFraction) |
| 104 |
|
|
compact = iceFraction + newIceFrac |
| 105 |
|
|
C- spread snow out over ice |
| 106 |
|
|
snowThick = snowThick*iceFraction/compact |
| 107 |
|
|
sst=(1. _d 0-newIceFrac)*sst+newIceFrac*Tf |
| 108 |
|
|
ENDIF |
| 109 |
|
|
qleft= iceThick*newIceFrac*qicAv/deltaTice |
| 110 |
|
|
fresh=-(rhoi*iceThick)*newIceFrac/deltaTice |
| 111 |
|
|
fsalt=-(rhoi*iceThick*saltice)*newIceFrac/deltaTice |
| 112 |
|
|
|
| 113 |
|
|
IF (dBug) WRITE(6,1020) 'ThSI_EXT: iceH, newIce, newIceFrac=', |
| 114 |
|
|
& iceThick, newIce, newIceFrac |
| 115 |
|
|
|
| 116 |
|
|
#endif /* ALLOW_THSICE */ |
| 117 |
|
|
|
| 118 |
|
|
RETURN |
| 119 |
|
|
END |
Parent Directory
| 
Revision Log
| 
Revision Graph