| 1 | ! |
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| 2 | ! $Id: stratemit.F90 2022-07-04 mmarchand $ |
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| 3 | ! |
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| 4 | SUBROUTINE STRATDISTRIB(altLMDz,altemiss,sigma_alt,f_lay_emiss) |
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| 5 | ! |
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| 6 | USE dimphy, ONLY : klon,klev |
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| 7 | USE strataer_local_var_mod |
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| 8 | USE lmdz_yomcst, only : RPI |
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| 9 | |
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| 10 | IMPLICIT NONE |
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| 11 | |
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| 12 | ! Input argument |
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| 13 | !--------------- |
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| 14 | REAL,DIMENSION(klev+1) :: altLMDz ! altitude of layer interfaces in m |
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| 15 | REAL :: sigma_alt |
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| 16 | REAL :: altemiss |
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| 17 | |
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| 18 | ! Local variables |
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| 19 | !---------------- |
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| 20 | REAL :: f_lay_sum ! sum of layer emission fractions |
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| 21 | REAL :: alt |
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| 22 | INTEGER :: k,i_int |
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| 23 | INTEGER,PARAMETER :: n_int_alt=10 ! subintervals nb for integration over Gaussian emission |
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| 24 | |
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| 25 | ! Output argument |
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| 26 | !---------------- |
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| 27 | REAL,DIMENSION(klev) :: f_lay_emiss ! emiss fraction for every emiss for every vertical layer |
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| 28 | |
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| 29 | |
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| 30 | ! Inject distrib |
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| 31 | !---------------- |
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| 32 | SELECT CASE(flag_emit_distrib) |
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| 33 | |
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| 34 | CASE(0) ! Gaussian distribution |
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| 35 | ! Compute distribution of emission to vertical model layers |
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| 36 | ! (based on Gaussian peak in altitude) |
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| 37 | f_lay_sum=0.0 |
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| 38 | DO k=1, klev |
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| 39 | f_lay_emiss(k)=0.0 |
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| 40 | DO i_int=1, n_int_alt |
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| 41 | alt=altLMDz(k)+float(i_int)*(altLMDz(k+1)-altLMDz(k))/float(n_int_alt) |
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| 42 | f_lay_emiss(k)=f_lay_emiss(k)+1./(sqrt(2.*RPI)*sigma_alt)* & |
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| 43 | exp(-0.5*((alt-altemiss)/sigma_alt)**2.)* & |
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| 44 | (altLMDz(k+1)-altLMDz(k))/float(n_int_alt) |
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| 45 | ENDDO |
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| 46 | f_lay_sum=f_lay_sum+f_lay_emiss(k) |
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| 47 | ENDDO |
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| 48 | |
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| 49 | CASE(1) ! Uniform distribution |
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| 50 | ! In this case, parameter sigma_alt is considered |
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| 51 | ! to be half the |
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| 52 | ! height of the injection, centered around altemiss) |
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| 53 | f_lay_sum=0.0 |
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| 54 | DO k=1, klev |
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| 55 | f_lay_emiss(k)=max(min(altemiss+sigma_alt,altLMDz(k+1))- & |
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| 56 | max(altemiss-sigma_alt, & |
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| 57 | altLMDz(k)),0.)/(2.*sigma_alt) |
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| 58 | f_lay_sum=f_lay_sum+f_lay_emiss(k) |
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| 59 | ENDDO |
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| 60 | |
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| 61 | END SELECT ! End CASE over flag_emit_distrib) |
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| 62 | |
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| 63 | WRITE(*,*) "IN stratdistrib f_lay_emiss=",f_lay_emiss |
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| 64 | |
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| 65 | !correct for step integration error |
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| 66 | f_lay_emiss(:)=f_lay_emiss(:)/f_lay_sum |
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| 67 | |
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| 68 | END SUBROUTINE STRATDISTRIB |
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