1 | !$Id: neutral.F90 10 2007-08-09 12:43:01Z acosce $ |
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2 | !! ========================================================================= |
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3 | !! INCA - INteraction with Chemistry and Aerosols |
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4 | !! |
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5 | !! Copyright Laboratoire des Sciences du Climat et de l'Environnement (LSCE) |
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6 | !! Unite mixte CEA-CNRS-UVSQ |
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7 | !! |
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8 | !! Contributors to this INCA subroutine: |
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9 | !! |
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10 | !! Didier Hauglustaine, LSCE, hauglustaine@cea.fr |
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11 | !! Stacy Walters, NCAR, stacy@ucar.edu |
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12 | !! |
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13 | !! Anne Cozic, LSCE, anne.cozic@cea.fr |
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14 | !! Yann Meurdesoif, LSCE, yann.meurdesoif@cea.fr |
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15 | !! |
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16 | !! This software is a computer program whose purpose is to simulate the |
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17 | !! atmospheric gas phase and aerosol composition. The model is designed to be |
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18 | !! used within a transport model or a general circulation model. This version |
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19 | !! of INCA was designed to be coupled to the LMDz GCM. LMDz-INCA accounts |
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20 | !! for emissions, transport (resolved and sub-grid scale), photochemical |
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21 | !! transformations, and scavenging (dry deposition and washout) of chemical |
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22 | !! species and aerosols interactively in the GCM. Several versions of the INCA |
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23 | !! model are currently used depending on the envisaged applications with the |
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24 | !! chemistry-climate model. |
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25 | !! |
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26 | !! This software is governed by the CeCILL license under French law and |
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27 | !! abiding by the rules of distribution of free software. You can use, |
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28 | !! modify and/ or redistribute the software under the terms of the CeCILL |
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29 | !! license as circulated by CEA, CNRS and INRIA at the following URL |
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30 | !! "http://www.cecill.info". |
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31 | !! |
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32 | !! As a counterpart to the access to the source code and rights to copy, |
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33 | !! modify and redistribute granted by the license, users are provided only |
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34 | !! with a limited warranty and the software's author, the holder of the |
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35 | !! economic rights, and the successive licensors have only limited |
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36 | !! liability. |
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37 | !! |
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38 | !! In this respect, the user's attention is drawn to the risks associated |
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39 | !! with loading, using, modifying and/or developing or reproducing the |
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40 | !! software by the user in light of its specific status of free software, |
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41 | !! that may mean that it is complicated to manipulate, and that also |
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42 | !! therefore means that it is reserved for developers and experienced |
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43 | !! professionals having in-depth computer knowledge. Users are therefore |
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44 | !! encouraged to load and test the software's suitability as regards their |
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45 | !! requirements in conditions enabling the security of their systems and/or |
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46 | !! data to be ensured and, more generally, to use and operate it in the |
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47 | !! same conditions as regards security. |
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48 | !! |
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49 | !! The fact that you are presently reading this means that you have had |
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50 | !! knowledge of the CeCILL license and that you accept its terms. |
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51 | !! ========================================================================= |
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52 | |
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53 | #include <inca_define.h> |
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54 | subroutine neutral(u10_mps,ustar_mps,obklen_m, u10n_mps ) |
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55 | !----------------------------------------------------------------------- |
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56 | ! subroutine to compute u10 neutral wind speed |
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57 | ! inputs |
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58 | ! u10_mps - wind speed at 10 m (m/s) |
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59 | ! ustar_mps - friction velocity (m/s) |
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60 | ! obklen_m - monin-obukhov length scale (m) |
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61 | ! outputs |
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62 | ! u10n_mps - wind speed at 10 m under neutral conditions (m/s) |
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63 | ! following code assumes reference height Z is 10m, consistent with use |
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64 | ! of u10 and u10_neutral. If not, code |
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65 | ! should be changed so that constants of 50. and 160. in equations |
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66 | ! below are changed to -5 * Z and -16 * Z respectively. |
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67 | ! Reference: G. L. Geernaert. 'Bulk parameterizations for the |
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68 | ! wind stress and heat fluxes,' in Surface Waves and Fluxes, Vol. I, |
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69 | ! Current Theory, Geernaert and W.J. Plant, editors, Kluwer Academic |
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70 | ! Publishers, Boston, MA, 1990. |
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71 | ! subroutine written Feb 2001 by eg chapman |
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72 | ! adapted to LMD-ZT by E. Cosme 310801 |
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73 | ! Following Will Shaw (PNL, Seattle) the theory applied for flux |
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74 | ! calculation with the scheme of Nightingale et al. (2000) does not |
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75 | ! hold anymore when -1<obklen<20. In this case, u10n is set to 0, |
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76 | ! so that the transfer velocity computed in nightingale.F will also |
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77 | ! be 0. The flux is then set to 0. |
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78 | !---------------------------------------------------------------------- |
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79 | |
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80 | use inca_dim |
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81 | use CONST_MOD |
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82 | IMPLICIT NONE |
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83 | |
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84 | real u10_mps(PLON),ustar_mps(PLON),obklen_m(PLON) |
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85 | real u10n_mps(PLON) |
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86 | real von_karman |
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87 | ! pour etre coherent avec vk de bl_for_dms.F |
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88 | parameter (von_karman = 0.35) |
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89 | |
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90 | real phi, phi_inv, phi_inv_sq, f1, f2, f3, dum1, psi |
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91 | integer i |
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92 | |
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93 | |
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94 | psi = 0. |
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95 | do i=1,PLON |
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96 | |
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97 | if (u10_mps(i) .lt. 0.) u10_mps(i) = 0.0 |
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98 | |
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99 | if (obklen_m(i) .lt. 0.) then |
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100 | phi = (1. - 160./obklen_m(i))**(-0.25) |
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101 | phi_inv = 1./phi |
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102 | phi_inv_sq = 1./phi * 1./phi |
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103 | f1 = (1. + phi_inv) / 2. |
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104 | f2 = (1. + phi_inv_sq)/2. |
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105 | ! following to avoid numerical overruns. recall tan(90deg)=infinity |
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106 | dum1 = min (1.e24, phi_inv) |
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107 | f3 = atan(dum1) |
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108 | psi = 2.*log(f1) + log(f2) - 2.*f3 + pi/2. |
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109 | else if (obklen_m(i) .gt. 0.) then |
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110 | psi = -50. / obklen_m(i) |
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111 | end if |
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112 | |
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113 | u10n_mps(i) = u10_mps(i) + (ustar_mps(i) * psi /von_karman ) |
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114 | ! u10n set to 0. if -1 < obklen < 20 |
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115 | if ((obklen_m(i).gt.-1.).and.(obklen_m(i).lt.20.)) then |
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116 | u10n_mps(i) = 0. |
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117 | endif |
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118 | if (u10n_mps(i) .lt. 0.) u10n_mps(i) = 0.0 |
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119 | |
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120 | enddo |
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121 | return |
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122 | end subroutine neutral |
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123 | |
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