1 | SUBROUTINE METHOX(KIDIA, KFDIA, KLON, KLEV,PQ, PTENQ, PAP ) |
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2 | |
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3 | !**** *METHOX* - Calculate humidity tendencies from methane |
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4 | ! oxidation and photolysis |
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5 | |
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6 | !** INTERFACE. |
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7 | ! ---------- |
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8 | ! CALL *METHOX* FROM *CALLPAR* |
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9 | ! ------ ------- |
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10 | |
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11 | ! EXPLICIT ARGUMENTS : |
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12 | ! -------------------- |
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13 | ! PARAMETER DESCRIPTION UNITS |
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14 | ! --------- ----------- ----- |
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15 | ! INPUT PARAMETERS (INTEGER): |
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16 | |
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17 | ! *KIDIA* START POINT |
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18 | ! *KFDIA* END POINT |
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19 | ! *KLON* NUMBER OF GRID POINTS PER PACKET |
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20 | ! *KLEV* NUMBER OF LEVELS |
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21 | |
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22 | ! INPUT PARAMETERS (REAL): |
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23 | |
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24 | ! *PAP* PRESSURE PA |
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25 | ! *PQ* SPECIFIC HUMIDITY KG/KG |
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26 | |
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27 | ! UPDATED PARAMETERS (REAL): |
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28 | |
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29 | ! *PTENQ* TENDENCY OF SPECIFIC HUMIDITY KG/(KG*S) |
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30 | |
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31 | ! NONE |
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32 | |
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33 | ! IMPLICIT ARGUMENTS : |
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34 | ! -------------------- |
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35 | ! MODULE YOEMETH |
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36 | ! MODULE YOMCST |
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37 | |
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38 | ! METHOD. |
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39 | ! ------- |
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40 | ! SEE RD-MEMO R60.1/AJS/31 |
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41 | |
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42 | ! EXTERNALS. |
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43 | ! ---------- |
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44 | ! NONE |
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45 | |
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46 | ! REFERENCE. |
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47 | ! ---------- |
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48 | ! SEE RD-MEMO R60.1/AJS/31 |
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49 | |
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50 | ! AUTHOR. |
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51 | ! ------- |
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52 | ! C.JAKOB *ECMWF* |
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53 | |
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54 | ! MODIFICATIONS. |
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55 | ! -------------- |
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56 | ! ORIGINAL : 98-04-07 |
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57 | ! M.Hamrud 01-Oct-2003 CY28 Cleaning |
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58 | ! D. Cugnet 24-Feb-2012 Adapted for LMDZ |
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59 | ! ------------------------------------------------------------------ |
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60 | |
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61 | USE YOEMETH , ONLY : RALPHA1 ,RALPHA2 ,RQLIM ,& |
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62 | & RPBOTOX, RPBOTPH ,RPTOPOX ,RPTOPPH ,& |
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63 | & RALPHA3, RLOGPPH |
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64 | |
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65 | USE yomcst_mod_h |
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66 | IMPLICIT NONE |
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67 | |
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68 | |
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69 | |
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70 | INTEGER,INTENT(IN) :: KLON |
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71 | INTEGER,INTENT(IN) :: KLEV |
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72 | INTEGER,INTENT(IN) :: KIDIA |
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73 | INTEGER,INTENT(IN) :: KFDIA |
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74 | REAL ,INTENT(IN) :: PQ(KLON,KLEV) |
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75 | REAL ,INTENT(INOUT) :: PTENQ(KLON,KLEV) |
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76 | REAL ,INTENT(IN) :: PAP(KLON,KLEV) |
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77 | LOGICAL :: LLOXID, LLPHOTO |
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78 | |
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79 | INTEGER :: JK, JL |
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80 | |
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81 | REAL :: ZARG, ZPRATIO, ZTAU1, ZTAU2, ZTDAYS |
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82 | |
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83 | DO JK=1,KLEV |
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84 | DO JL=KIDIA,KFDIA |
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85 | |
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86 | LLOXID=PAP(JL,JK) < RPBOTOX.AND.PQ(JL,JK) < RQLIM |
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87 | LLPHOTO=PAP(JL,JK) < RPBOTPH |
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88 | |
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89 | ! METHANE OXIDATION |
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90 | |
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91 | IF(LLOXID) THEN |
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92 | IF(PAP(JL,JK) <= RPTOPOX) THEN |
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93 | ZTDAYS=100. |
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94 | ELSE |
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95 | ZPRATIO=(LOG(PAP(JL,JK)/RPTOPOX))**4./LOG(RPBOTOX/PAP(JL,JK)) |
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96 | ZTDAYS=100.*(1+RALPHA1*ZPRATIO) |
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97 | ENDIF |
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98 | ZTAU1=86400.*ZTDAYS |
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99 | PTENQ(JL,JK)=PTENQ(JL,JK)+(RQLIM-PQ(JL,JK))/ZTAU1 |
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100 | ENDIF |
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101 | |
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102 | ! PHOTOLYSIS |
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103 | |
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104 | IF(LLPHOTO) THEN |
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105 | IF(PAP(JL,JK) <= RPTOPPH) THEN |
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106 | ZTDAYS=3. |
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107 | ELSE |
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108 | ZARG=RALPHA2-RALPHA3*(1+COS((RPI*LOG(PAP(JL,JK)/RPBOTPH))/RLOGPPH)) |
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109 | ZTDAYS=1.0/(EXP(ZARG)-0.01) |
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110 | ENDIF |
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111 | ZTAU2=86400.*ZTDAYS |
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112 | PTENQ(JL,JK)=PTENQ(JL,JK)-PQ(JL,JK)/ZTAU2 |
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113 | ENDIF |
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114 | ENDDO |
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115 | ENDDO |
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116 | |
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117 | END SUBROUTINE METHOX |
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118 | |
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119 | |
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