| 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 | USE lmdz_yomcst |
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| 65 | |
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| 66 | IMPLICIT NONE |
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| 67 | |
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| 68 | INTEGER, INTENT(IN) :: KLON |
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| 69 | INTEGER, INTENT(IN) :: KLEV |
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| 70 | INTEGER, INTENT(IN) :: KIDIA |
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| 71 | INTEGER, INTENT(IN) :: KFDIA |
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| 72 | REAL, INTENT(IN) :: PQ(KLON, KLEV) |
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| 73 | REAL, INTENT(INOUT) :: PTENQ(KLON, KLEV) |
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| 74 | REAL, INTENT(IN) :: PAP(KLON, KLEV) |
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| 75 | LOGICAL :: LLOXID, LLPHOTO |
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| 76 | |
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| 77 | INTEGER :: JK, JL |
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| 78 | |
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| 79 | REAL :: ZARG, ZPRATIO, ZTAU1, ZTAU2, ZTDAYS |
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| 80 | |
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| 81 | DO JK = 1, KLEV |
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| 82 | DO JL = KIDIA, KFDIA |
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| 83 | |
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| 84 | LLOXID = PAP(JL, JK) < RPBOTOX.AND.PQ(JL, JK) < RQLIM |
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| 85 | LLPHOTO = PAP(JL, JK) < RPBOTPH |
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| 86 | |
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| 87 | ! METHANE OXIDATION |
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| 88 | |
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| 89 | IF(LLOXID) THEN |
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| 90 | IF(PAP(JL, JK) <= RPTOPOX) THEN |
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| 91 | ZTDAYS = 100. |
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| 92 | ELSE |
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| 93 | ZPRATIO = (LOG(PAP(JL, JK) / RPTOPOX))**4. / LOG(RPBOTOX / PAP(JL, JK)) |
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| 94 | ZTDAYS = 100. * (1 + RALPHA1 * ZPRATIO) |
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| 95 | ENDIF |
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| 96 | ZTAU1 = 86400. * ZTDAYS |
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| 97 | PTENQ(JL, JK) = PTENQ(JL, JK) + (RQLIM - PQ(JL, JK)) / ZTAU1 |
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| 98 | ENDIF |
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| 99 | |
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| 100 | ! PHOTOLYSIS |
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| 101 | |
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| 102 | IF(LLPHOTO) THEN |
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| 103 | IF(PAP(JL, JK) <= RPTOPPH) THEN |
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| 104 | ZTDAYS = 3. |
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| 105 | ELSE |
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| 106 | ZARG = RALPHA2 - RALPHA3 * (1 + COS((RPI * LOG(PAP(JL, JK) / RPBOTPH)) / RLOGPPH)) |
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| 107 | ZTDAYS = 1.0 / (EXP(ZARG) - 0.01) |
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| 108 | ENDIF |
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| 109 | ZTAU2 = 86400. * ZTDAYS |
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| 110 | PTENQ(JL, JK) = PTENQ(JL, JK) - PQ(JL, JK) / ZTAU2 |
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| 111 | ENDIF |
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| 112 | ENDDO |
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| 113 | ENDDO |
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| 114 | |
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| 115 | END SUBROUTINE METHOX |
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| 116 | |
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| 117 | |
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