1 | ;+ |
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2 | ; |
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3 | ; compute transformation |
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4 | ; |
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5 | ; @param todo {in} |
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6 | ; |
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7 | ; input denflx = density flux |
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8 | ; |
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9 | ; @uses |
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10 | ; <pro>common</pro> |
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11 | ; <propost_it>com_eg</propost_it> |
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12 | ; |
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13 | ; @history |
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14 | ; EG january 2001 (inspired from denflux.f) |
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15 | ; |
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16 | ; @version |
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17 | ; $Id$ |
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18 | ; |
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19 | ;- |
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20 | FUNCTION make_transfo, file_name, ncdf_db, todo $ |
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21 | , BOXZOOM=boxzoom $ |
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22 | , TIME_1=time_1 $ |
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23 | , TIME_2=time_2 $ |
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24 | , ALL_DATA=all_data $ |
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25 | , ZMTYP=zmtyp |
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26 | ; |
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27 | compile_opt idl2, strictarrsubs |
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28 | ; |
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29 | @common |
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30 | @com_eg |
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31 | ; |
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32 | ; |
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33 | ; Read sst (C), sss (PSU), Q [W/m2], E-P [kg/m2/s]=[mm/s] |
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34 | ; |
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35 | sst = nc_read(file_name,'sosstsst', ncdf_db, BOXZOOM = boxzoom, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data) |
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36 | sss = nc_read(file_name,'sosaline', ncdf_db, BOXZOOM = boxzoom, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data) |
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37 | hef = nc_read(file_name,'sohefldo', ncdf_db, BOXZOOM = boxzoom, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data) |
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38 | emp = nc_read(file_name,'sowaflup', ncdf_db, BOXZOOM = boxzoom, TIME_1 = time_1, TIME_2 = time_2, ALL_DATA = all_data) |
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39 | sst = sst.data |
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40 | sss = sss.data |
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41 | hef = hef.data |
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42 | emp = emp.data |
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43 | |
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44 | idxt=where(sst eq valmask) |
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45 | idxs=where(sss eq valmask) |
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46 | IF idxt[0] NE -1 THEN sst[idxt]=0. |
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47 | IF idxs[0] NE -1 THEN sss[idxs]=0. |
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48 | |
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49 | ; Compute potential density (sigma_0) |
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50 | |
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51 | rho0 = eos[sst, sss]-1000. |
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52 | IF idxs[0] NE -1 THEN rho0[idxt] = valmask |
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53 | |
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54 | ; Define density grid |
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55 | |
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56 | n_sig = (sig_max - sig_min)/sig_del + 1 |
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57 | z_sig = sig_min+findgen(n_sig)*sig_del |
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58 | |
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59 | ; other inits |
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60 | |
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61 | sizef = size(sst) |
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62 | jpi = sizef[1] |
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63 | jpj = sizef[2] |
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64 | jpt = 1 |
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65 | IF sizef[0] EQ 3 THEN jpt = sizef[3] |
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66 | |
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67 | dt = 1./float(jpt) ; integration delta time |
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68 | drho = sig_del ; delta rho |
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69 | dsig = sig_del |
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70 | P = 0. ; pressure = 0 (potential density) |
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71 | |
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72 | t_area = 0. |
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73 | t_heat = 0. |
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74 | t_wafl = 0. |
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75 | fluxbar = 0. |
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76 | fluxsal = 0. |
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77 | |
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78 | ; Output arrays |
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79 | |
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80 | fheat = fltarr(jpi, jpj, jpt) |
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81 | fwafl = fltarr(jpi, jpj, jpt) |
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82 | dia = fltarr(n_sig+1) |
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83 | diawf = fltarr(n_sig+1) |
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84 | diat = fltarr( n_sig+1, jpt) |
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85 | diawft = fltarr(n_sig+1, jpt) |
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86 | hist = fltarr(n_sig+1, jpt) |
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87 | histwf = fltarr(n_sig+1, jpt) |
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88 | area = fltarr(n_sig+1, jpt) |
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89 | nval = lonarr(n_sig+1, jpt) |
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90 | |
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91 | ; Work arrays |
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92 | |
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93 | timwrk = fltarr(jpt) |
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94 | |
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95 | trf_bin = fltarr(n_sig+1) |
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96 | trf_bin[*] = 0. |
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97 | ; |
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98 | ; Loop on 2D domain (and time as '*' dimension) |
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99 | ; |
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100 | FOR ji = 0, (jpi-1) DO BEGIN |
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101 | FOR jj = 0, (jpj-1) DO BEGIN |
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102 | |
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103 | IF rho0[ji, jj, 0] NE valmask THEN BEGIN |
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104 | ; |
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105 | ; input fields |
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106 | t = sst[ji, jj, *] |
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107 | s = sss[ji, jj, *] |
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108 | hf = hef[ji, jj, *] |
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109 | ep = emp[ji, jj, *] |
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110 | sig = rho0[ji, jj, *] |
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111 | |
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112 | ; compte alpha, beta, Cp |
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113 | al = alpha[t, s, P] |
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114 | be = betar[t, s, P] |
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115 | Cp = Cpsw[t, s, P] |
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116 | |
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117 | ; find density bin |
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118 | ib = ROUND((sig-sig_min)/dsig) |
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119 | |
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120 | ib = ib > 0 |
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121 | ib = ib < n_sig |
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122 | |
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123 | ; compute area and integral of fluxes |
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124 | |
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125 | dA = e1t[ji, jj]*e2t[ji, jj] |
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126 | ; conv = m2 -> 1.e6 km2 |
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127 | conv = 1.e-6*1.e-6 |
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128 | t_area = t_area + dA*conv |
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129 | ; conv = W -> PW |
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130 | conv = 1.e-15 |
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131 | t_heat = t_heat + total(hf)*dt*dA*conv |
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132 | ; conv = mm -> m and m3/s to Sv |
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133 | conv = 1.e-3*1.e-6 |
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134 | t_wafl = t_wafl + total(ep)*dt*dA*conv |
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135 | |
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136 | ; tally number of point in each bin |
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137 | |
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138 | FOR jt = 0, (jpt-1) DO BEGIN |
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139 | area[ib[jt], jt] = area[ib[jt], jt] + dA |
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140 | nval[ib[jt], jt] = nval[ib[jt], jt] + 1 |
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141 | ENDFOR |
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142 | |
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143 | ; sum heat and fresh water fluxes as mass fluxes in kg/m2/s (all units SI) |
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144 | ; convwf : kg/m2/s=mm/s -> m/s |
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145 | convwf = 1.e-3 |
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146 | fheat[ji, jj, *] = ( -al/Cp)*hf |
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147 | fwafl[ji, jj, *] = (1000.+sig)*be*s*ep*convwf |
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148 | |
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149 | ; volume transport per density class (m3/s) |
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150 | ; period averaged density flux |
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151 | FOR jt = 0, (jpt-1) DO BEGIN |
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152 | fht = fheat[ji, jj, jt]*dA |
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153 | fwf = fwafl[ji, jj, jt]*dA |
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154 | hist[ib[jt], jt] = hist[ib[jt], jt] + (fht+fwf)/drho |
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155 | histwf[ib[jt], jt] = histwf[ib[jt], jt] + fwf/drho |
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156 | fluxbar = fluxbar + (fht+fwf)*dt |
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157 | fluxsal = fluxsal + (fwf)*dt |
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158 | ENDFOR |
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159 | |
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160 | ENDIF |
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161 | ; end of loop on ji,jj |
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162 | ENDFOR |
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163 | ENDFOR |
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164 | |
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165 | |
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166 | print, ' ' |
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167 | print, ' ----------------------------------------------------------------' |
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168 | print, ' Transformation statitics' |
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169 | print, ' ----------------------------------------------------------------' |
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170 | print, ' Net heat flux in ocean (PW) : ', t_heat |
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171 | print, ' Net water flux in ocean (Sv) : ', t_wafl |
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172 | print, ' Period averaged density flux (kg/s) : ', fluxbar |
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173 | print, ' - heat flux contribution (kg/s) : ', fluxbar-fluxsal |
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174 | print, ' - fresh water flux contribution (kg/s) : ', fluxsal |
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175 | print, ' Integral area (glob.=357.208) (10^6 km2) : ', t_area |
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176 | print, ' ' |
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177 | |
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178 | ; output |
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179 | |
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180 | CASE todo OF ; |
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181 | 'denflx': result = (fheat+fwafl) ; density flux |
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182 | 'denflw': result = (fwafl) ; fresh water density flux |
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183 | ELSE: result = -1 |
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184 | ENDCASE |
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185 | |
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186 | return, result |
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187 | END |
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