1 | ! Copyright (c) 2009, Centre National de la Recherche Scientifique |
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2 | ! All rights reserved. |
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3 | ! |
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4 | ! Redistribution and use in source and binary forms, with or without modification, are permitted |
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5 | ! provided that the following conditions are met: |
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6 | ! |
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7 | ! * Redistributions of source code must retain the above copyright notice, this list |
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8 | ! of conditions and the following disclaimer. |
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9 | ! * Redistributions in binary form must reproduce the above copyright notice, this list |
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10 | ! of conditions and the following disclaimer in the documentation and/or other materials |
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11 | ! provided with the distribution. |
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12 | ! * Neither the name of the LMD/IPSL/CNRS/UPMC nor the names of its |
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13 | ! contributors may be used to endorse or promote products derived from this software without |
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14 | ! specific prior written permission. |
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15 | ! |
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16 | ! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR |
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17 | ! IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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18 | ! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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19 | ! CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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20 | ! DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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21 | ! DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
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22 | ! IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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23 | ! OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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24 | |
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25 | |
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26 | !------------------------------------------------------------------------------------ |
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27 | ! Authors: Sandrine Bony and Helene Chepfer (LMD/IPSL, CNRS, UPMC, France). |
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28 | !------------------------------------------------------------------------------------ |
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29 | MODULE MOD_LMD_IPSL_STATS |
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30 | USE MOD_LLNL_STATS |
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31 | IMPLICIT NONE |
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32 | |
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33 | CONTAINS |
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34 | SUBROUTINE diag_lidar(npoints,ncol,llm,max_bin,nrefl & |
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35 | ,pnorm,pmol,refl,land,pplay,undef,ok_lidar_cfad & |
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36 | ,cfad2,srbval & |
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37 | ,ncat,lidarcld,cldlayer,parasolrefl) |
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38 | ! |
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39 | ! ----------------------------------------------------------------------------------- |
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40 | ! Lidar outputs : |
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41 | ! |
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42 | ! Diagnose cloud fraction (3D cloud fraction + low/middle/high/total cloud fraction |
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43 | ! from the lidar signals (ATB and molecular ATB) computed from model outputs |
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44 | ! + |
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45 | ! Compute CFADs of lidar scattering ratio SR and of depolarization index |
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46 | ! |
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47 | ! Authors: Sandrine Bony and Helene Chepfer (LMD/IPSL, CNRS, UPMC, France). |
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48 | ! |
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49 | ! December 2008, S. Bony, H. Chepfer and J-L. Dufresne : |
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50 | ! - change of the cloud detection threshold S_cld from 3 to 5, for better |
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51 | ! with both day and night observations. The optical thinest clouds are missed. |
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52 | ! - remove of the detection of the first fully attenuated layer encountered from above. |
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53 | ! December 2008, A. Bodas-Salcedo: |
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54 | ! - Dimensions of pmol reduced to (npoints,llm) |
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55 | ! |
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56 | ! Version 1.0 (June 2007) |
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57 | ! Version 1.1 (May 2008) |
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58 | ! Version 1.2 (June 2008) |
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59 | ! Version 2.0 (October 2008) |
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60 | ! Version 2.1 (December 2008) |
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61 | ! c------------------------------------------------------------------------------------ |
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62 | |
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63 | ! c inputs : |
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64 | integer npoints |
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65 | integer ncol |
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66 | integer llm |
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67 | integer max_bin ! nb of bins for SR CFADs |
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68 | integer ncat ! nb of cloud layer types (low,mid,high,total) |
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69 | integer nrefl ! nb of solar zenith angles for parasol reflectances |
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70 | |
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71 | real undef ! undefined value |
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72 | real pnorm(npoints,ncol,llm) ! lidar ATB |
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73 | real pmol(npoints,llm) ! molecular ATB |
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74 | real land(npoints) ! Landmask [0 - Ocean, 1 - Land] |
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75 | real pplay(npoints,llm) ! pressure on model levels (Pa) |
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76 | logical ok_lidar_cfad ! true if lidar CFAD diagnostics need to be computed |
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77 | real refl(npoints,ncol,nrefl) ! subgrid parasol reflectance ! parasol |
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78 | |
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79 | ! c outputs : |
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80 | real lidarcld(npoints,llm) ! 3D "lidar" cloud fraction |
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81 | real cldlayer(npoints,ncat) ! "lidar" cloud fraction (low, mid, high, total) |
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82 | real cfad2(npoints,max_bin,llm) ! CFADs of SR |
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83 | real srbval(max_bin) ! SR bins in CFADs |
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84 | real parasolrefl(npoints,nrefl)! grid-averaged parasol reflectance |
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85 | |
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86 | ! c threshold for cloud detection : |
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87 | real S_clr |
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88 | parameter (S_clr = 1.2) |
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89 | real S_cld |
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90 | ! parameter (S_cld = 3.0) ! Previous thresold for cloud detection |
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91 | parameter (S_cld = 5.0) ! New (dec 2008) thresold for cloud detection |
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92 | real S_att |
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93 | parameter (S_att = 0.01) |
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94 | |
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95 | ! c local variables : |
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96 | integer ic,k |
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97 | real x3d(npoints,ncol,llm) |
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98 | real x3d_c(npoints,llm),pnorm_c(npoints,llm) |
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99 | real xmax |
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100 | ! |
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101 | ! c ------------------------------------------------------- |
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102 | ! c 0- Initializations |
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103 | ! c ------------------------------------------------------- |
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104 | ! Parasol reflectance algorithm is not valid over land. Write |
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105 | ! a warning if there is no land. Landmask [0 - Ocean, 1 - Land] |
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106 | IF ( MAXVAL(land(:)) .EQ. 0.0) THEN |
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107 | WRITE (*,*) 'WARNING. PARASOL reflectance is not valid over land' & |
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108 | & ,' and there is only land' |
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109 | END IF |
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110 | |
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111 | ! Should be modified in future version |
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112 | xmax=undef-1.0 |
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113 | |
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114 | ! c ------------------------------------------------------- |
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115 | ! c 1- Lidar scattering ratio : |
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116 | ! c ------------------------------------------------------- |
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117 | ! |
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118 | ! where ((pnorm.lt.xmax) .and. (pmol.lt.xmax) .and. (pmol.gt. 0.0 )) |
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119 | ! x3d = pnorm/pmol |
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120 | ! elsewhere |
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121 | ! x3d = undef |
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122 | ! end where |
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123 | ! A.B-S: pmol reduced to 2D (npoints,llm) (Dec 08) |
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124 | do ic = 1, ncol |
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125 | pnorm_c = pnorm(:,ic,:) |
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126 | where ((pnorm_c.lt.xmax) .and. (pmol.lt.xmax) .and. (pmol.gt. 0.0 )) |
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127 | x3d_c = pnorm_c/pmol |
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128 | elsewhere |
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129 | x3d_c = undef |
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130 | end where |
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131 | x3d(:,ic,:) = x3d_c |
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132 | enddo |
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133 | |
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134 | ! c ------------------------------------------------------- |
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135 | ! c 2- Diagnose cloud fractions (3D, low, middle, high, total) |
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136 | ! c from subgrid-scale lidar scattering ratios : |
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137 | ! c ------------------------------------------------------- |
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138 | |
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139 | CALL COSP_CLDFRAC(npoints,ncol,llm,ncat, & |
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140 | x3d,pplay, S_att,S_cld,undef,lidarcld, & |
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141 | cldlayer) |
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142 | |
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143 | ! c ------------------------------------------------------- |
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144 | ! c 3- CFADs |
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145 | ! c ------------------------------------------------------- |
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146 | if (ok_lidar_cfad) then |
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147 | ! |
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148 | ! c CFADs of subgrid-scale lidar scattering ratios : |
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149 | ! c ------------------------------------------------------- |
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150 | CALL COSP_CFAD_SR(npoints,ncol,llm,max_bin, & |
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151 | x3d, & |
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152 | S_att,S_clr,xmax,cfad2,srbval) |
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153 | |
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154 | endif ! ok_lidar_cfad |
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155 | ! c ------------------------------------------------------- |
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156 | |
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157 | ! c ------------------------------------------------------- |
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158 | ! c 4- Compute grid-box averaged Parasol reflectances |
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159 | ! c ------------------------------------------------------- |
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160 | |
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161 | parasolrefl(:,:) = 0.0 |
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162 | |
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163 | do k = 1, nrefl |
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164 | do ic = 1, ncol |
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165 | parasolrefl(:,k) = parasolrefl(:,k) + refl(:,ic,k) |
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166 | enddo |
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167 | enddo |
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168 | |
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169 | do k = 1, nrefl |
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170 | parasolrefl(:,k) = parasolrefl(:,k) / float(ncol) |
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171 | ! if land=1 -> parasolrefl=undef |
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172 | ! if land=0 -> parasolrefl=parasolrefl |
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173 | parasolrefl(:,k) = parasolrefl(:,k) * MAX(1.0-land(:),0.0) & |
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174 | + (1.0 - MAX(1.0-land(:),0.0))*undef |
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175 | enddo |
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176 | |
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177 | RETURN |
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178 | END SUBROUTINE diag_lidar |
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179 | |
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180 | |
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181 | !%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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182 | !-------------------- FUNCTION COSP_CFAD_SR ------------------------ |
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183 | ! Author: Sandrine Bony (LMD/IPSL, CNRS, Paris) |
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184 | !%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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185 | SUBROUTINE COSP_CFAD_SR(Npoints,Ncolumns,Nlevels,Nbins, & |
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186 | x,S_att,S_clr,xmax,cfad,srbval) |
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187 | IMPLICIT NONE |
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188 | |
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189 | !--- Input arguments |
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190 | ! Npoints: Number of horizontal points |
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191 | ! Ncolumns: Number of subcolumns |
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192 | ! Nlevels: Number of levels |
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193 | ! Nbins: Number of x axis bins |
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194 | ! xmax: maximum value allowed for x |
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195 | ! S_att: Threshold for full attenuation |
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196 | ! S_clr: Threshold for clear-sky layer |
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197 | ! |
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198 | !--- Input-Outout arguments |
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199 | ! x: variable to process (Npoints,Ncolumns,Nlevels), mofified where saturation occurs |
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200 | ! |
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201 | ! -- Output arguments |
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202 | ! srbval : values of the histogram bins |
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203 | ! cfad: 2D histogram on each horizontal point |
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204 | |
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205 | ! Input arguments |
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206 | integer Npoints,Ncolumns,Nlevels,Nbins |
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207 | real xmax,S_att,S_clr |
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208 | ! Input-output arguments |
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209 | real x(Npoints,Ncolumns,Nlevels) |
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210 | ! Output : |
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211 | real cfad(Npoints,Nbins,Nlevels) |
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212 | real srbval(Nbins) |
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213 | ! Local variables |
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214 | integer i, j, k, ib |
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215 | |
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216 | ! c ------------------------------------------------------- |
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217 | ! c 0- Initializations |
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218 | ! c ------------------------------------------------------- |
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219 | if ( Nbins .lt. 6) return |
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220 | |
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221 | srbval(1) = S_att |
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222 | srbval(2) = S_clr |
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223 | srbval(3) = 3.0 |
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224 | srbval(4) = 5.0 |
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225 | srbval(5) = 7.0 |
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226 | srbval(6) = 10.0 |
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227 | do i = 7, MIN(10,Nbins) |
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228 | srbval(i) = srbval(i-1) + 5.0 |
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229 | enddo |
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230 | DO i = 11, MIN(13,Nbins) |
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231 | srbval(i) = srbval(i-1) + 10.0 |
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232 | enddo |
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233 | srbval(MIN(14,Nbins)) = 80.0 |
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234 | srbval(Nbins) = xmax |
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235 | cfad(:,:,:) = 0.0 |
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236 | |
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237 | |
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238 | ! c ------------------------------------------------------- |
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239 | ! c c- Compute CFAD |
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240 | ! c ------------------------------------------------------- |
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241 | |
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242 | do j = Nlevels, 1, -1 |
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243 | do k = 1, Ncolumns |
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244 | where ( x(:,k,j).le.srbval(1) ) & |
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245 | cfad(:,1,j) = cfad(:,1,j) + 1.0 |
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246 | enddo !k |
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247 | enddo !j |
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248 | |
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249 | do ib = 2, Nbins |
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250 | do j = Nlevels, 1, -1 |
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251 | do k = 1, Ncolumns |
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252 | where ( ( x(:,k,j).gt.srbval(ib-1) ) .and. ( x(:,k,j).le.srbval(ib) ) ) & |
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253 | cfad(:,ib,j) = cfad(:,ib,j) + 1.0 |
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254 | enddo !k |
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255 | enddo !j |
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256 | enddo !ib |
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257 | |
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258 | cfad(:,:,:) = cfad(:,:,:) / float(Ncolumns) |
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259 | |
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260 | ! c ------------------------------------------------------- |
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261 | RETURN |
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262 | END SUBROUTINE COSP_CFAD_SR |
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263 | |
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264 | !%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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265 | !-------------------- SUBROUTINE COSP_CLDFRAC ------------------- |
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266 | ! c Purpose: Cloud fraction diagnosed from lidar measurements |
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267 | !%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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268 | SUBROUTINE COSP_CLDFRAC(Npoints,Ncolumns,Nlevels,Ncat, & |
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269 | x,pplay,S_att,S_cld,undef,lidarcld, & |
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270 | cldlayer) |
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271 | IMPLICIT NONE |
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272 | ! Input arguments |
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273 | integer Npoints,Ncolumns,Nlevels,Ncat |
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274 | real x(Npoints,Ncolumns,Nlevels) |
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275 | real pplay(Npoints,Nlevels) |
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276 | real S_att,S_cld |
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277 | real undef |
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278 | ! Output : |
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279 | real lidarcld(Npoints,Nlevels) ! 3D cloud fraction |
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280 | real cldlayer(Npoints,Ncat) ! low, middle, high, total cloud fractions |
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281 | ! Local variables |
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282 | integer ip, k, iz, ic |
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283 | real p1 |
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284 | real cldy(Npoints,Ncolumns,Nlevels) |
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285 | real srok(Npoints,Ncolumns,Nlevels) |
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286 | real cldlay(Npoints,Ncolumns,Ncat) |
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287 | real nsublay(Npoints,Ncolumns,Ncat), nsublayer(Npoints,Ncat) |
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288 | real nsub(Npoints,Nlevels) |
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289 | |
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290 | |
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291 | ! --------------------------------------------------------------- |
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292 | ! 1- initialization |
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293 | ! --------------------------------------------------------------- |
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294 | |
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295 | if ( Ncat .ne. 4 ) then |
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296 | print *,'Error in lmd_ipsl_stats.cosp_cldfrac, Ncat must be 4, not',Ncat |
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297 | stop |
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298 | endif |
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299 | |
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300 | lidarcld = 0.0 |
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301 | nsub = 0.0 |
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302 | cldlay = 0.0 |
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303 | nsublay = 0.0 |
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304 | |
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305 | ! --------------------------------------------------------------- |
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306 | ! 2- Cloud detection |
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307 | ! --------------------------------------------------------------- |
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308 | |
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309 | do k = 1, Nlevels |
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310 | |
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311 | ! cloud detection at subgrid-scale: |
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312 | where ( (x(:,:,k).gt.S_cld) .and. (x(:,:,k).ne. undef) ) |
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313 | cldy(:,:,k)=1.0 |
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314 | elsewhere |
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315 | cldy(:,:,k)=0.0 |
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316 | endwhere |
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317 | |
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318 | ! number of usefull sub-columns: |
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319 | where ( (x(:,:,k).gt.S_att) .and. (x(:,:,k).ne. undef) ) |
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320 | srok(:,:,k)=1.0 |
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321 | elsewhere |
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322 | srok(:,:,k)=0.0 |
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323 | endwhere |
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324 | |
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325 | enddo ! k |
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326 | |
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327 | ! --------------------------------------------------------------- |
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328 | ! 3- grid-box 3D cloud fraction and layered cloud fractions (ISCCP pressure |
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329 | ! categories) : |
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330 | ! --------------------------------------------------------------- |
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331 | ! Test abderr |
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332 | do k = Nlevels, 1, -1 |
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333 | do ic = 1, Ncolumns |
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334 | do ip = 1, Npoints |
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335 | iz=1 |
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336 | p1 = pplay(ip,k) |
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337 | if ( p1.gt.0. .and. p1.lt.(440.*100.)) then ! high clouds |
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338 | iz=3 |
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339 | else if(p1.ge.(440.*100.) .and. p1.lt.(680.*100.)) then ! mid clouds |
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340 | iz=2 |
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341 | endif |
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342 | |
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343 | cldlay(ip,ic,iz) = MAX(cldlay(ip,ic,iz),cldy(ip,ic,k)) |
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344 | cldlay(ip,ic,4) = MAX(cldlay(ip,ic,4),cldy(ip,ic,k)) |
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345 | lidarcld(ip,k)=lidarcld(ip,k) + cldy(ip,ic,k) |
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346 | |
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347 | nsublay(ip,ic,iz) = MAX(nsublay(ip,ic,iz),srok(ip,ic,k)) |
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348 | nsublay(ip,ic,4) = MAX(nsublay(ip,ic,4),srok(ip,ic,k)) |
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349 | nsub(ip,k)=nsub(ip,k) + srok(ip,ic,k) |
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350 | |
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351 | enddo |
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352 | enddo |
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353 | enddo |
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354 | |
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355 | ! -- grid-box 3D cloud fraction |
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356 | |
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357 | where ( nsub(:,:).gt.0.0 ) |
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358 | lidarcld(:,:) = lidarcld(:,:)/nsub(:,:) |
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359 | elsewhere |
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360 | lidarcld(:,:) = undef |
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361 | endwhere |
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362 | |
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363 | ! -- layered cloud fractions |
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364 | |
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365 | cldlayer = 0.0 |
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366 | nsublayer = 0.0 |
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367 | |
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368 | do iz = 1, Ncat |
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369 | do ic = 1, Ncolumns |
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370 | |
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371 | cldlayer(:,iz)=cldlayer(:,iz) + cldlay(:,ic,iz) |
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372 | nsublayer(:,iz)=nsublayer(:,iz) + nsublay(:,ic,iz) |
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373 | |
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374 | enddo |
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375 | enddo |
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376 | where ( nsublayer(:,:).gt.0.0 ) |
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377 | cldlayer(:,:) = cldlayer(:,:)/nsublayer(:,:) |
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378 | elsewhere |
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379 | cldlayer(:,:) = undef |
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380 | endwhere |
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381 | |
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382 | RETURN |
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383 | END SUBROUTINE COSP_CLDFRAC |
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384 | ! --------------------------------------------------------------- |
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385 | |
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386 | END MODULE MOD_LMD_IPSL_STATS |
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