1 | MODULE cyclone |
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2 | !!====================================================================== |
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3 | !! *** MODULE cyclone *** |
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4 | !! add the Tropical Cyclones along tracks to the surface wind forcing |
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5 | !! |
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6 | !!====================================================================== |
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7 | !! History : 3.3 ! 2010-05 (E Vincent, G Madec, S Masson) Original code |
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8 | !!---------------------------------------------------------------------- |
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9 | |
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10 | #if defined key_cyclone |
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11 | !!---------------------------------------------------------------------- |
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12 | !! 'key_cyclone' : key option add Tropical Cyclones in the wind forcing |
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13 | !!---------------------------------------------------------------------- |
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14 | !! wnd_cyc : 1 module subroutine |
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15 | !!---------------------------------------------------------------------- |
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16 | USE oce ! ocean dynamics and active tracers |
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17 | USE sbc_oce ! surface boundary condition: ocean |
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18 | USE dom_oce ! ocean space domain variables |
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19 | USE phycst ! physical constant |
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20 | USE fldread ! read input fields |
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21 | USE in_out_manager ! I/O manager |
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22 | USE geo2ocean ! tools for projection on ORCA grid |
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23 | USE lib_mpp |
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24 | |
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25 | IMPLICIT NONE |
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26 | PRIVATE |
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27 | |
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28 | PUBLIC wnd_cyc ! routine called in sbcblk.F90 module |
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29 | |
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30 | INTEGER , PARAMETER :: jp_is1 = 1 ! index of presence 1 or absence 0 of a TC record |
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31 | INTEGER , PARAMETER :: jp_lon = 2 ! index of longitude for present TCs |
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32 | INTEGER , PARAMETER :: jp_lat = 3 ! index of latitude for present TCs |
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33 | INTEGER , PARAMETER :: jp_vmax = 4 ! index of max wind for present TCs |
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34 | INTEGER , PARAMETER :: jp_pres = 5 ! index of eye-pres for present TCs |
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35 | |
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36 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read) |
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37 | |
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38 | !! * Substitutions |
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39 | # include "do_loop_substitute.h90" |
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40 | !!---------------------------------------------------------------------- |
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41 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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42 | !! $Id$ |
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43 | !! Software governed by the CeCILL license (see ./LICENSE) |
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44 | !!---------------------------------------------------------------------- |
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45 | |
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46 | CONTAINS |
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47 | |
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48 | SUBROUTINE wnd_cyc( kt, pwnd_i, pwnd_j ) |
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49 | !!---------------------------------------------------------------------- |
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50 | !! *** ROUTINE wnd_cyc *** |
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51 | !! |
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52 | !! ** Purpose : Add cyclone winds on the ORCA grid |
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53 | !! |
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54 | !! ** Action : - open TC data, find TCs for the current timestep |
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55 | !! - for each potential TC, add the winds on the grid |
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56 | !!---------------------------------------------------------------------- |
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57 | INTEGER , INTENT(in) :: kt ! time step index |
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58 | REAL(wp), INTENT(out), DIMENSION(jpi,jpj) :: pwnd_i ! wind speed i-components at T-point ORCA direction |
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59 | REAL(wp), INTENT(out), DIMENSION(jpi,jpj) :: pwnd_j ! wind speed j-components at T-point ORCA direction |
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60 | ! |
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61 | !! |
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62 | INTEGER :: ji, jj , jtc ! loop arguments |
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63 | INTEGER :: ierror ! loop arguments |
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64 | INTEGER :: vortex=1 ! vortex shape to be used: 0=Holland 1=Willoughby |
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65 | REAL(wp) :: zrout1=1.5e6 ! distance from center where we begin to kill vortex (m) |
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66 | REAL(wp) :: zrout2=2.5e6 ! distance from center where we bring vortex to zero (m) |
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67 | REAL(wp) :: zb ! power in Holland vortex shape |
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68 | REAL(wp) :: zA ! shape parameter in Willoughby vortex : A transtion between first and second outter exp |
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69 | REAL(wp) :: zn ! shape parameter in Willoughby vortex : n power law in the eye |
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70 | REAL(wp) :: zXX1 ! shape parameter in Willoughby vortex : decay length second outter exponential |
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71 | REAL(wp) :: zXX2 ! shape parameter in Willoughby vortex : decay length first outter exponential |
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72 | REAL(wp) :: zztmp ! temporary |
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73 | REAL(wp) :: zzrglam, zzrgphi ! temporary |
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74 | REAL(wp) :: ztheta ! azimuthal angle |
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75 | REAL(wp) :: zdist ! dist to the TC center |
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76 | REAL(wp) :: zhemi ! 1 for NH ; -1 for SH |
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77 | REAL(wp) :: zinfl ! clim inflow angle in TCs |
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78 | REAL(wp) :: zrmw ! mean radius of Max wind of a tropical cyclone (Willoughby 2004) [m] |
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79 | REAL(wp) :: zwnd_r, zwnd_t ! radial and tangential components of the wind |
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80 | REAL(wp) :: zvmax ! timestep interpolated vmax |
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81 | REAL(wp) :: zrlon, zrlat ! temporary |
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82 | REAL(wp), DIMENSION(jpi,jpj) :: zwnd_x, zwnd_y ! zonal and meridional components of the wind |
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83 | REAL(wp), DIMENSION(14,5) :: ztct ! tropical cyclone track data at kt |
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84 | ! |
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85 | CHARACTER(len=100) :: cn_dir ! Root directory for location of files |
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86 | TYPE(FLD_N), DIMENSION(1) :: slf_i ! array of namelist informations on the TC position |
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87 | TYPE(FLD_N) :: sn_tc ! informations about the fields to be read |
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88 | !!-------------------------------------------------------------------- |
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89 | |
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90 | ! ! ====================== ! |
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91 | IF( kt == nit000 ) THEN ! First call kt=nit000 ! |
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92 | ! ! ====================== ! |
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93 | ! set file information (default values) |
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94 | cn_dir = './' ! directory in which the model is executed |
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95 | ! |
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96 | ! (NB: frequency positive => hours, negative => months) |
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97 | ! ! file ! frequency ! variable ! time intep ! clim ! 'yearly' or ! weights ! rotation ! land/sea mask ! |
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98 | ! ! name ! (hours) ! name ! (T/F) ! (T/F) ! 'monthly' ! filename ! pairs ! filename ! |
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99 | sn_tc = FLD_N( 'tc_track', 6 , 'tc' , .true. , .false. , 'yearly' , '' , '' , '' ) |
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100 | ! |
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101 | ! Namelist is read in namsbc_blk |
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102 | ! set sf structure |
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103 | ALLOCATE( sf(1), STAT=ierror ) |
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104 | IF( ierror > 0 ) THEN |
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105 | CALL ctl_stop( 'wnd_cyc: unable to allocate sf structure' ) ; RETURN |
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106 | ENDIF |
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107 | ALLOCATE( sf(1)%fnow(14,5,1) ) |
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108 | ALLOCATE( sf(1)%fdta(14,5,1,2) ) |
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109 | slf_i(1) = sn_tc |
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110 | ! |
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111 | ! fill sf with slf_i and control print |
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112 | CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_tc', 'tropical cyclone track', 'namsbc_tc' ) |
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113 | ! |
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114 | ENDIF |
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115 | |
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116 | |
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117 | ! Interpolation of lon lat vmax... at the current timestep |
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118 | ! *************************************************************** |
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119 | |
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120 | CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step |
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121 | |
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122 | ztct(:,:) = sf(1)%fnow(:,:,1) |
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123 | |
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124 | ! Add TC wind on the grid |
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125 | ! *************************************************************** |
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126 | |
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127 | zwnd_x(:,:) = 0.e0 |
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128 | zwnd_y(:,:) = 0.e0 |
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129 | |
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130 | DO jtc = 1, 14 |
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131 | ! |
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132 | IF( ztct(jtc,jp_is1) == 1 ) THEN ! cyclone is defined in this slot ? yes--> begin |
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133 | |
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134 | zvmax = ztct(jtc,jp_vmax) |
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135 | zrlon = rad * ztct(jtc,jp_lon ) |
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136 | zrlat = rad * ztct(jtc,jp_lat ) |
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137 | zhemi = SIGN( 1. , zrlat ) |
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138 | zinfl = 15.* rad ! clim inflow angle in Tropical Cyclones |
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139 | IF( vortex == 0 ) THEN |
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140 | |
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141 | ! Vortex Holland reconstruct wind at each lon-lat position |
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142 | ! ******************************************************** |
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143 | zrmw = 51.6 * EXP( -0.0223*zvmax + 0.0281* ABS( ztct(jtc,jp_lat) ) ) * 1000. |
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144 | ! climatological ZRMW of cyclones as a function of wind and latitude (Willoughby 2004) |
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145 | ! zb = 1.0036 + 0.0173 * zvmax - 0.0313 * LOG(zrmw/1000.) + 0.0087 * ABS( ztct(jtc,jp_lat) ) |
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146 | ! fitted B parameter (Willoughby 2004) |
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147 | zb = 2. |
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148 | |
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149 | DO_2D( 1, 1, 1, 1 ) |
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150 | |
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151 | ! calc distance between TC center and any point following great circle |
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152 | ! source : http://www.movable-type.co.uk/scripts/latlong.html |
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153 | zzrglam = rad * glamt(ji,jj) - zrlon |
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154 | zzrgphi = rad * gphit(ji,jj) |
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155 | zdist = ra * ACOS( SIN( zrlat ) * SIN( zzrgphi ) & |
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156 | & + COS( zrlat ) * COS( zzrgphi ) * COS( zzrglam ) ) |
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157 | |
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158 | IF(zdist < zrout2) THEN ! calculation of wind only to a given max radius |
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159 | ! shape of the wind profile |
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160 | zztmp = ( zrmw / ( zdist + 1.e-12 ) )**zb |
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161 | zztmp = zvmax * SQRT( zztmp * EXP(1. - zztmp) ) |
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162 | |
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163 | IF(zdist > zrout1) THEN ! bring to zero between r_out1 and r_out2 |
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164 | zztmp = zztmp * ( (zrout2-zdist)*1.e-6 ) |
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165 | ENDIF |
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166 | |
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167 | ! !!! KILL EQ WINDS |
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168 | ! IF(SIGN( 1. , zrlat ) /= zhemi) THEN |
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169 | ! zztmp = 0. ! winds in other hemisphere |
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170 | ! IF(ABS(gphit(ji,jj)) <= 5.) zztmp=0. ! kill between 5N-5S |
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171 | ! ENDIF |
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172 | ! IF(ABS(gphit(ji,jj)) <= 10. .and. ABS(gphit(ji,jj)) > 5.) THEN |
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173 | ! zztmp = zztmp * ( 1./5. * (ABS(gphit(ji,jj)) - 5.) ) |
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174 | ! !linear to zero between 10 and 5 |
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175 | ! ENDIF |
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176 | ! !!! / KILL EQ |
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177 | |
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178 | IF(ABS(gphit(ji,jj)) >= 55.) zztmp = 0. ! kill weak spurious winds at high latitude |
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179 | |
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180 | zwnd_t = COS( zinfl ) * zztmp |
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181 | zwnd_r = - SIN( zinfl ) * zztmp |
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182 | |
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183 | ! Project radial-tangential components on zonal-meridional components |
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184 | ! ------------------------------------------------------------------- |
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185 | |
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186 | ! ztheta = azimuthal angle of the great circle between two points |
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187 | zztmp = COS( zrlat ) * SIN( zzrgphi ) & |
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188 | & - SIN( zrlat ) * COS( zzrgphi ) * COS( zzrglam ) |
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189 | ztheta = ATAN2( COS( zzrgphi ) * SIN( zzrglam ) , zztmp ) |
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190 | |
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191 | zwnd_x(ji,jj) = zwnd_x(ji,jj) - zhemi * COS(ztheta)*zwnd_t + SIN(ztheta)*zwnd_r |
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192 | zwnd_y(ji,jj) = zwnd_y(ji,jj) + zhemi * SIN(ztheta)*zwnd_t + COS(ztheta)*zwnd_r |
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193 | ENDIF |
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194 | END_2D |
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195 | |
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196 | ELSE IF( vortex == 1 ) THEN |
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197 | |
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198 | ! Vortex Willoughby reconstruct wind at each lon-lat position |
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199 | ! *********************************************************** |
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200 | zrmw = 46.4 * EXP( -0.0155*zvmax + 0.0169* ABS( ztct(jtc,jp_lat) ) )*1000. |
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201 | ! climatological ZRMW of cyclones as a function of wind and latitude (Willoughby 2006) |
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202 | zXX2 = 25.*1000. ! 25km fixed "near-eye" exponential decay |
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203 | zXX1 = ( 287.6 - 1.942 *zvmax + 7.799 *LOG(zrmw/1000.) + 1.819 *ABS( ztct(jtc,jp_lat) ) )*1000. |
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204 | zn = 2.1340 + 0.0077*zvmax - 0.4522*LOG(zrmw/1000.) - 0.0038*ABS( ztct(jtc,jp_lat) ) |
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205 | zA = 0.5913 + 0.0029*zvmax - 0.1361*LOG(zrmw/1000.) - 0.0042*ABS( ztct(jtc,jp_lat) ) |
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206 | IF(zA < 0) THEN |
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207 | zA=0 |
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208 | ENDIF |
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209 | |
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210 | DO_2D( 1, 1, 1, 1 ) |
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211 | |
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212 | zzrglam = rad * glamt(ji,jj) - zrlon |
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213 | zzrgphi = rad * gphit(ji,jj) |
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214 | zdist = ra * ACOS( SIN( zrlat ) * SIN( zzrgphi ) & |
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215 | & + COS( zrlat ) * COS( zzrgphi ) * COS( zzrglam ) ) |
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216 | |
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217 | IF(zdist < zrout2) THEN ! calculation of wind only to a given max radius |
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218 | |
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219 | ! shape of the wind profile |
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220 | IF(zdist <= zrmw) THEN ! inside the Radius of Maximum Wind |
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221 | zztmp = zvmax * (zdist/zrmw)**zn |
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222 | ELSE |
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223 | zztmp = zvmax * ( (1-zA) * EXP(- (zdist-zrmw)/zXX1 ) + zA * EXP(- (zdist-zrmw)/zXX2 ) ) |
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224 | ENDIF |
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225 | |
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226 | IF(zdist > zrout1) THEN ! bring to zero between r_out1 and r_out2 |
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227 | zztmp = zztmp * ( (zrout2-zdist)*1.e-6 ) |
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228 | ENDIF |
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229 | |
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230 | ! !!! KILL EQ WINDS |
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231 | ! IF(SIGN( 1. , zrlat ) /= zhemi) THEN |
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232 | ! zztmp = 0. ! winds in other hemisphere |
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233 | ! IF(ABS(gphit(ji,jj)) <= 5.) zztmp=0. ! kill between 5N-5S |
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234 | ! ENDIF |
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235 | ! IF(ABS(gphit(ji,jj)) <= 10. .and. ABS(gphit(ji,jj)) > 5.) THEN |
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236 | ! zztmp = zztmp * ( 1./5. * (ABS(gphit(ji,jj)) - 5.) ) |
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237 | ! !linear to zero between 10 and 5 |
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238 | ! ENDIF |
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239 | ! !!! / KILL EQ |
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240 | |
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241 | IF(ABS(gphit(ji,jj)) >= 55.) zztmp = 0. ! kill weak spurious winds at high latitude |
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242 | |
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243 | zwnd_t = COS( zinfl ) * zztmp |
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244 | zwnd_r = - SIN( zinfl ) * zztmp |
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245 | |
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246 | ! Project radial-tangential components on zonal-meridional components |
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247 | ! ------------------------------------------------------------------- |
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248 | |
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249 | ! ztheta = azimuthal angle of the great circle between two points |
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250 | zztmp = COS( zrlat ) * SIN( zzrgphi ) & |
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251 | & - SIN( zrlat ) * COS( zzrgphi ) * COS( zzrglam ) |
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252 | ztheta = ATAN2( COS( zzrgphi ) * SIN( zzrglam ) , zztmp ) |
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253 | |
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254 | zwnd_x(ji,jj) = zwnd_x(ji,jj) - zhemi * COS(ztheta)*zwnd_t + SIN(ztheta)*zwnd_r |
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255 | zwnd_y(ji,jj) = zwnd_y(ji,jj) + zhemi * SIN(ztheta)*zwnd_t + COS(ztheta)*zwnd_r |
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256 | |
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257 | ENDIF |
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258 | END_2D |
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259 | ENDIF ! / vortex Holland or Wiloughby |
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260 | ENDIF ! / cyclone is defined in this slot ? yes--> begin |
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261 | END DO ! / end simultaneous cyclones loop |
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262 | |
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263 | CALL rot_rep ( zwnd_x, zwnd_y, 'T', 'en->i', pwnd_i ) !rotation of components on ORCA grid |
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264 | CALL rot_rep ( zwnd_x, zwnd_y, 'T', 'en->j', pwnd_j ) !rotation of components on ORCA grid |
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265 | |
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266 | END SUBROUTINE wnd_cyc |
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267 | |
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268 | #endif |
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269 | |
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270 | !!====================================================================== |
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271 | END MODULE cyclone |
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