AHI Cloud Detection based on IR Cloud Mask #1139
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| Original file line number | Diff line number | Diff line change |
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| subroutine da_trop_wmo (t, z, p, nlev, tropt, tropp, tropk) | ||
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| !---------------------------------------------------------------------------- | ||
| ! * Computes tropopause T, P, and/or level based on code from Cameron Homeyer | ||
| ! and WMO definition | ||
| ! | ||
| ! * WMO tropopause definition: | ||
| ! The boundary between the troposphere and the stratosphere, where an | ||
| ! abrupt change in lapse rate usually occurs. It is defined as the lowest | ||
| ! level at which the lapse rate decreases to 2 °C/km or less, provided | ||
| ! that the average lapse rate between this level and all higher levels | ||
| ! within 2 km does not exceed 2 °C/km. | ||
| !---------------------------------------------------------------------------- | ||
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| implicit none | ||
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| ! Assumed shape inputs for single column (size=nlev) | ||
| ! ordered from bottom to top of model | ||
| real, intent(in) :: t(:) ! Temperature, K. (3D) | ||
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| !JJG: "z" is supposed to be height, not geopotential height. Does it matter? | ||
| real, intent(in) :: z(:) ! Geopotential height above m.s.l., m. | ||
| real, intent(in) :: p(:) ! Pressure, mb. | ||
| real, optional, intent(out) :: tropt ! Tropopause temperature, K. | ||
| real, optional, intent(out) :: tropp ! Tropopause pressure, mb. | ||
| integer, optional, intent(out) :: tropk | ||
| integer, intent(in) :: nlev | ||
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| real :: dtdz,laps !LAPS | ||
| integer :: dtdztest(nlev), ztest(nlev) | ||
| integer :: i, j, k, kk, ktrop | ||
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| ! real, parameter :: tropz_min = 5000.0 | ||
| ! real, parameter :: tropz_max = 19000.0 | ||
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| if (.not.present(tropt) .and. & | ||
| .not.present(tropp) .and. & | ||
| .not.present(tropk)) return | ||
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| if (present(tropt)) tropt = missing_r | ||
| if (present(tropp)) tropp = missing_r | ||
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| !Loop over levels to find tropopause (single column) | ||
| ktrop = nlev-1 | ||
| trop_loop: do k = 1, nlev-1 | ||
| if ( p(k) .le. 500.0 ) then | ||
| ! Compute lapse rate (-dT/dz) | ||
| dtdz = ( t(k+1) - t(k) ) / & | ||
| ( z(k) - z(k+1) ) | ||
| else | ||
| ! Set lapse rate for p > 500 hPa | ||
| dtdz = 999.9 | ||
| endif | ||
| !Check if local lapse rate <= 2 K/km | ||
| if (dtdz .le. 0.002) then | ||
| ! Initialize lapse rate and altitude test arrays | ||
| dtdztest = 0 | ||
| ztest = 0 | ||
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| ! Compute average lapse rate across levels above current candidate | ||
| do kk = k+1, nlev-1 | ||
| dtdz = ( t(kk+1) - t(k) ) / & | ||
| ( z(k) - z(kk+1) ) | ||
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| !If avg. lapse rate <= 2 K/km and z <= trop + 2 km, set pass flag | ||
| if ( ( dtdz .le. 0.002 ) .and. & | ||
| ( (z(k) - z(kk)) .le. 2000. ) ) THEN | ||
| dtdztest(kk) = 1 | ||
| endif | ||
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| ! If z <= trop + 2 km, set pass flag | ||
| IF ( (z(k) - z(kk)) .le. 2000.0 ) THEN | ||
| ztest(kk) = 1 | ||
| endif | ||
| enddo !kk loop | ||
| laps=dtdz !LAPS | ||
| IF (SUM(dtdztest) .eq. SUM(ztest)) THEN | ||
| ! If qualified as tropopause, set altitude index and return value | ||
| ktrop = k | ||
| exit trop_loop | ||
| ENDIF | ||
| ENDIF | ||
| end do trop_loop | ||
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| ! ! Filter ktrop using tpause height thresholds | ||
| ! ztest = 0 | ||
| ! if ( z(ktrop) .gt. tropz_max ) then | ||
| ! where ( z.le.tropz_max ) | ||
| ! ztest = 1 | ||
| ! end where | ||
| ! do k = nlev, 1, -1 | ||
| ! if (ztest(k) .eq. 1) then | ||
| ! ktrop = k | ||
| ! exit | ||
| ! end if | ||
| ! end do | ||
| ! else if ( z(ktrop) .lt. tropz_min ) then | ||
| ! where ( z.ge.tropz_min ) | ||
| ! ztest = 1 | ||
| ! end where | ||
| ! do k = 1, nlev | ||
| ! if (ztest(k) .eq. 1) then | ||
| ! ktrop = k | ||
| ! exit | ||
| ! end if | ||
| ! end do | ||
| ! end if | ||
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| if (present(tropt)) tropt = t(ktrop) | ||
| if (present(tropp)) tropp = p(ktrop) | ||
| if (present(tropk)) tropk = ktrop | ||
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| end subroutine da_trop_wmo | ||
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what means '_zz'? Zhuge&Zou (2016)?, If so, please add some description inside " ".