MODULE cyclone !!====================================================================== !! *** MODULE cyclone *** !! add the Tropical Cyclones along tracks to the surface wind forcing !! !!====================================================================== !! History : 3.3 ! 2010-05 (E Vincent, G Madec, S Masson) Original code !!---------------------------------------------------------------------- #if defined key_cyclone !!---------------------------------------------------------------------- !! 'key_cyclone' : key option add Tropical Cyclones in the wind forcing !!---------------------------------------------------------------------- !! wnd_cyc : 1 module subroutine !!---------------------------------------------------------------------- USE oce ! ocean dynamics and active tracers USE sbc_oce ! surface boundary condition: ocean USE dom_oce ! ocean space domain variables USE phycst ! physical constant USE fldread ! read input fields USE in_out_manager ! I/O manager USE geo2ocean ! tools for projection on ORCA grid USE wrk_nemo ! work arrays USE lib_mpp IMPLICIT NONE PRIVATE PUBLIC wnd_cyc ! routine called in sbcblk_core.F90 module INTEGER , PARAMETER :: jp_is1 = 1 ! index of presence 1 or absence 0 of a TC record INTEGER , PARAMETER :: jp_lon = 2 ! index of longitude for present TCs INTEGER , PARAMETER :: jp_lat = 3 ! index of latitude for present TCs INTEGER , PARAMETER :: jp_vmax = 4 ! index of max wind for present TCs INTEGER , PARAMETER :: jp_pres = 5 ! index of eye-pres for present TCs TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read) !! * Substitutions # include "vectopt_loop_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OPA 3.3 , LOCEAN-IPSL (2010) !! $Id: cyclone.F90 2355 2015-05-20 07:11:50Z ufla $ !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE wnd_cyc( kt, pwnd_i, pwnd_j ) !!---------------------------------------------------------------------- !! *** ROUTINE wnd_cyc *** !! !! ** Purpose : Add cyclone winds on the ORCA grid !! !! ** Action : - open TC data, find TCs for the current timestep !! - for each potential TC, add the winds on the grid !!---------------------------------------------------------------------- INTEGER , INTENT(in) :: kt ! time step index REAL(wp), INTENT(out), DIMENSION(jpi,jpj) :: pwnd_i ! wind speed i-components at T-point ORCA direction REAL(wp), INTENT(out), DIMENSION(jpi,jpj) :: pwnd_j ! wind speed j-components at T-point ORCA direction ! !! INTEGER :: ji, jj , jtc ! loop arguments INTEGER :: ierror ! loop arguments INTEGER :: vortex=1 ! vortex shape to be used: 0=Holland 1=Willoughby REAL(wp) :: zrout1=1.5e6 ! distance from center where we begin to kill vortex (m) REAL(wp) :: zrout2=2.5e6 ! distance from center where we bring vortex to zero (m) REAL(wp) :: zb ! power in Holland vortex shape REAL(wp) :: zA ! shape parameter in Willoughby vortex : A transtion between first and second outter exp REAL(wp) :: zn ! shape parameter in Willoughby vortex : n power law in the eye REAL(wp) :: zXX1 ! shape parameter in Willoughby vortex : decay length second outter exponential REAL(wp) :: zXX2 ! shape parameter in Willoughby vortex : decay length first outter exponential REAL(wp) :: zztmp ! temporary REAL(wp) :: zzrglam, zzrgphi ! temporary REAL(wp) :: ztheta ! azimuthal angle REAL(wp) :: zdist ! dist to the TC center REAL(wp) :: zhemi ! 1 for NH ; -1 for SH REAL(wp) :: zinfl ! clim inflow angle in TCs REAL(wp) :: zrmw ! mean radius of Max wind of a tropical cyclone (Willoughby 2004) [m] REAL(wp) :: zwnd_r, zwnd_t ! radial and tangential components of the wind REAL(wp) :: zvmax ! timestep interpolated vmax REAL(wp) :: zrlon, zrlat ! temporary REAL(wp), DIMENSION(:,:), POINTER :: zwnd_x, zwnd_y ! zonal and meridional components of the wind REAL(wp), DIMENSION(14,5) :: ztct ! tropical cyclone track data at kt ! CHARACTER(len=100) :: cn_dir ! Root directory for location of files TYPE(FLD_N), DIMENSION(1) :: slf_i ! array of namelist informations on the TC position TYPE(FLD_N) :: sn_tc ! informations about the fields to be read !!-------------------------------------------------------------------- CALL wrk_alloc( jpi,jpj, zwnd_x, zwnd_y ) ! ! ====================== ! IF( kt == nit000 ) THEN ! First call kt=nit000 ! ! ! ====================== ! ! set file information (default values) cn_dir = './' ! directory in which the model is executed ! ! (NB: frequency positive => hours, negative => months) ! ! file ! frequency ! variable ! time intep ! clim ! 'yearly' or ! weights ! rotation ! land/sea mask ! ! ! name ! (hours) ! name ! (T/F) ! (T/F) ! 'monthly' ! filename ! pairs ! filename ! sn_tc = FLD_N( 'tc_track', 6 , 'tc' , .true. , .false. , 'yearly' , '' , '' , '' ) ! ! Namelist is read in namsbc_core ! set sf structure ALLOCATE( sf(1), STAT=ierror ) IF( ierror > 0 ) THEN CALL ctl_stop( 'wnd_cyc: unable to allocate sf structure' ) ; RETURN ENDIF ALLOCATE( sf(1)%fnow(14,5,1) ) ALLOCATE( sf(1)%fdta(14,5,1,2) ) slf_i(1) = sn_tc ! ! fill sf with slf_i and control print CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_tc', 'tropical cyclone track', 'namsbc_tc' ) ! ENDIF ! Interpolation of lon lat vmax... at the current timestep ! *************************************************************** CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step ztct(:,:) = sf(1)%fnow(:,:,1) ! Add TC wind on the grid ! *************************************************************** zwnd_x(:,:) = 0.e0 zwnd_y(:,:) = 0.e0 DO jtc = 1, 14 ! IF( ztct(jtc,jp_is1) == 1 ) THEN ! cyclone is defined in this slot ? yes--> begin zvmax = ztct(jtc,jp_vmax) zrlon = rad * ztct(jtc,jp_lon ) zrlat = rad * ztct(jtc,jp_lat ) zhemi = SIGN( 1. , zrlat ) zinfl = 15.* rad ! clim inflow angle in Tropical Cyclones IF ( vortex == 0 ) THEN ! Vortex Holland reconstruct wind at each lon-lat position ! ******************************************************** zrmw = 51.6 * EXP( -0.0223*zvmax + 0.0281* ABS( ztct(jtc,jp_lat) ) ) * 1000. ! climatological ZRMW of cyclones as a function of wind and latitude (Willoughby 2004) ! zb = 1.0036 + 0.0173 * zvmax - 0.0313 * LOG(zrmw/1000.) + 0.0087 * ABS( ztct(jtc,jp_lat) ) ! fitted B parameter (Willoughby 2004) zb = 2. DO jj = 1, jpj DO ji = 1, jpi ! calc distance between TC center and any point following great circle ! source : http://www.movable-type.co.uk/scripts/latlong.html zzrglam = rad * glamt(ji,jj) - zrlon zzrgphi = rad * gphit(ji,jj) zdist = ra * ACOS( SIN( zrlat ) * SIN( zzrgphi ) & & + COS( zrlat ) * COS( zzrgphi ) * COS( zzrglam ) ) IF (zdist < zrout2) THEN ! calculation of wind only to a given max radius ! shape of the wind profile zztmp = ( zrmw / ( zdist + 1.e-12 ) )**zb zztmp = zvmax * SQRT( zztmp * EXP(1. - zztmp) ) IF (zdist > zrout1) THEN ! bring to zero between r_out1 and r_out2 zztmp = zztmp * ( (zrout2-zdist)*1.e-6 ) ENDIF ! !!! KILL EQ WINDS ! IF (SIGN( 1. , zrlat ) /= zhemi) THEN ! zztmp = 0. ! winds in other hemisphere ! IF (ABS(gphit(ji,jj)) <= 5.) zztmp=0. ! kill between 5N-5S ! ENDIF ! IF (ABS(gphit(ji,jj)) <= 10. .and. ABS(gphit(ji,jj)) > 5.) THEN ! zztmp = zztmp * ( 1./5. * (ABS(gphit(ji,jj)) - 5.) ) ! !linear to zero between 10 and 5 ! ENDIF ! !!! / KILL EQ IF (ABS(gphit(ji,jj)) >= 55.) zztmp = 0. ! kill weak spurious winds at high latitude zwnd_t = COS( zinfl ) * zztmp zwnd_r = - SIN( zinfl ) * zztmp ! Project radial-tangential components on zonal-meridional components ! ------------------------------------------------------------------- ! ztheta = azimuthal angle of the great circle between two points zztmp = COS( zrlat ) * SIN( zzrgphi ) & & - SIN( zrlat ) * COS( zzrgphi ) * COS( zzrglam ) ztheta = ATAN2( COS( zzrgphi ) * SIN( zzrglam ) , zztmp ) zwnd_x(ji,jj) = zwnd_x(ji,jj) - zhemi * COS(ztheta)*zwnd_t + SIN(ztheta)*zwnd_r zwnd_y(ji,jj) = zwnd_y(ji,jj) + zhemi * SIN(ztheta)*zwnd_t + COS(ztheta)*zwnd_r ENDIF END DO END DO ELSE IF ( vortex == 1 ) THEN ! Vortex Willoughby reconstruct wind at each lon-lat position ! *********************************************************** zrmw = 46.4 * EXP( -0.0155*zvmax + 0.0169* ABS( ztct(jtc,jp_lat) ) )*1000. ! climatological ZRMW of cyclones as a function of wind and latitude (Willoughby 2006) zXX2 = 25.*1000. ! 25km fixed "near-eye" exponential decay zXX1 = ( 287.6 - 1.942 *zvmax + 7.799 *LOG(zrmw/1000.) + 1.819 *ABS( ztct(jtc,jp_lat) ) )*1000. zn = 2.1340 + 0.0077*zvmax - 0.4522*LOG(zrmw/1000.) - 0.0038*ABS( ztct(jtc,jp_lat) ) zA = 0.5913 + 0.0029*zvmax - 0.1361*LOG(zrmw/1000.) - 0.0042*ABS( ztct(jtc,jp_lat) ) IF (zA < 0) THEN zA=0 ENDIF DO jj = 1, jpj DO ji = 1, jpi zzrglam = rad * glamt(ji,jj) - zrlon zzrgphi = rad * gphit(ji,jj) zdist = ra * ACOS( SIN( zrlat ) * SIN( zzrgphi ) & & + COS( zrlat ) * COS( zzrgphi ) * COS( zzrglam ) ) IF (zdist < zrout2) THEN ! calculation of wind only to a given max radius ! shape of the wind profile IF (zdist <= zrmw) THEN ! inside the Radius of Maximum Wind zztmp = zvmax * (zdist/zrmw)**zn ELSE zztmp = zvmax * ( (1-zA) * EXP(- (zdist-zrmw)/zXX1 ) + zA * EXP(- (zdist-zrmw)/zXX2 ) ) ENDIF IF (zdist > zrout1) THEN ! bring to zero between r_out1 and r_out2 zztmp = zztmp * ( (zrout2-zdist)*1.e-6 ) ENDIF ! !!! KILL EQ WINDS ! IF (SIGN( 1. , zrlat ) /= zhemi) THEN ! zztmp = 0. ! winds in other hemisphere ! IF (ABS(gphit(ji,jj)) <= 5.) zztmp=0. ! kill between 5N-5S ! ENDIF ! IF (ABS(gphit(ji,jj)) <= 10. .and. ABS(gphit(ji,jj)) > 5.) THEN ! zztmp = zztmp * ( 1./5. * (ABS(gphit(ji,jj)) - 5.) ) ! !linear to zero between 10 and 5 ! ENDIF ! !!! / KILL EQ IF (ABS(gphit(ji,jj)) >= 55.) zztmp = 0. ! kill weak spurious winds at high latitude zwnd_t = COS( zinfl ) * zztmp zwnd_r = - SIN( zinfl ) * zztmp ! Project radial-tangential components on zonal-meridional components ! ------------------------------------------------------------------- ! ztheta = azimuthal angle of the great circle between two points zztmp = COS( zrlat ) * SIN( zzrgphi ) & & - SIN( zrlat ) * COS( zzrgphi ) * COS( zzrglam ) ztheta = ATAN2( COS( zzrgphi ) * SIN( zzrglam ) , zztmp ) zwnd_x(ji,jj) = zwnd_x(ji,jj) - zhemi * COS(ztheta)*zwnd_t + SIN(ztheta)*zwnd_r zwnd_y(ji,jj) = zwnd_y(ji,jj) + zhemi * SIN(ztheta)*zwnd_t + COS(ztheta)*zwnd_r ENDIF END DO END DO ENDIF ! / vortex Holland or Wiloughby ENDIF ! / cyclone is defined in this slot ? yes--> begin END DO ! / end simultaneous cyclones loop CALL rot_rep ( zwnd_x, zwnd_y, 'T', 'en->i', pwnd_i ) !rotation of components on ORCA grid CALL rot_rep ( zwnd_x, zwnd_y, 'T', 'en->j', pwnd_j ) !rotation of components on ORCA grid CALL wrk_dealloc( jpi,jpj, zwnd_x, zwnd_y ) END SUBROUTINE wnd_cyc #endif !!====================================================================== END MODULE cyclone