cldprop()

subroutine rrtmg_sw::cldprop ( real (kind=kind_phys), dimension(nlay), intent(in)  cfrac, real (kind=kind_phys), dimension(nlay), intent(in)  cliqp, real (kind=kind_phys), dimension(nlay), intent(in)  reliq, real (kind=kind_phys), dimension(nlay), intent(in)  cicep, real (kind=kind_phys), dimension(nlay), intent(in)  reice, real (kind=kind_phys), dimension(nlay), intent(in)  cdat1, real (kind=kind_phys), dimension(nlay), intent(in)  cdat2, real (kind=kind_phys), dimension(nlay), intent(in)  cdat3, real (kind=kind_phys), dimension(nlay), intent(in)  cdat4, real (kind=kind_phys), intent(in)  cf1, integer, intent(in)  nlay, integer, intent(in)  ipseed, real (kind=kind_phys), dimension(nlay), intent(in)  dz, real (kind=kind_phys), intent(in)  delgth, real (kind=kind_phys), dimension(nlay), intent(in)  alpha, real (kind=kind_phys), dimension(nlay,nbdsw), intent(out)  taucw, real (kind=kind_phys), dimension(nlay,nbdsw), intent(out)  ssacw, real (kind=kind_phys), dimension(nlay,nbdsw), intent(out)  asycw, real (kind=kind_phys), dimension(nlay), intent(out)  cldfrc, real (kind=kind_phys), dimension(nlay,ngptsw), intent(out)  cldfmc  )

private

Parameters

cfrac	layer cloud fraction for physparam::iswcliq > 0 (prognostic cloud scheme) - - -
cliqp	layer in-cloud liq water path ( \(g/m^2\))
reliq	mean eff radius for liq cloud (micron)
cicep	layer in-cloud ice water path ( \(g/m^2\))
reice	mean eff radius for ice cloud (micron)
cdat1	layer rain drop water path ( \(g/m^2\))
cdat2	effective radius for rain drop (micron)
cdat3	layer snow flake water path( \(g/m^2\))
cdat4	mean eff radius for snow flake(micron) for physparam::iswcliq = 0 (diagnostic cloud scheme) - - -
cliqp	not used
cicep	not used
reliq	not used
reice	not used
cdat1	layer cloud optical depth
cdat2	layer cloud single scattering albedo
cdat3	layer cloud asymmetry factor
cdat4	optional use
cf1	effective total cloud cover at surface
nlay	vertical layer number
ipseed	permutation seed for generating random numbers (isubcsw>0)
dz	layer thickness (km)
delgth	layer cloud decorrelation length (km)
alpha	EXP/ER cloud overlap decorrelation parameter
taucw	cloud optical depth, w/o delta scaled
ssacw	weighted cloud single scattering albedo (ssa = ssacw / taucw)
asycw	weighted cloud asymmetry factor (asy = asycw / ssacw)
cldfrc	cloud fraction of grid mean value
cldfmc	cloud fraction for each sub-column

cldprop General Algorithm

• Compute cloud radiative properties for a cloudy column.
• Compute optical properties for rain and snow.
  For rain: tauran/ssaran/asyran
  For snow: tausnw/ssasnw/asysnw
  • Calculation of absorption coefficients due to water clouds
    For water clouds: tauliq/ssaliq/asyliq
  • Calculation of absorption coefficients due to ice clouds
    For ice clouds: tauice/ssaice/asyice
  • For Prognostic cloud scheme: sum up the cloud optical property:
    \( taucw=tauliq+tauice+tauran+tausnw \)
    \( ssacw=ssaliq+ssaice+ssaran+ssasnw \)
    \( asycw=asyliq+asyice+asyran+asysnw \)
• If use fu's formula it needs to be normalized by snow/ice density. not use snow density = 0.1 g/cm**3 = 0.1 g/(mu * m**2)
  use ice density = 0.9167 g/cm**3 = 0.9167 g/(mu * m**2)
  1/0.9167 = 1.09087
  factor 1.5396=8/(3*sqrt(3)) converts reff to generalized ice particle size use newer factor value 1.0315
• Calculation of absorption coefficients due to water clouds.
• Calculation of absorption coefficients due to ice clouds.
• ebert and curry approach for all particle sizes though somewhat unjustified for large ice particles.
• streamer approach for ice effective radius between 5.0 and 131.0 microns.
• fu's approach for ice effective radius between 4.8 and 135 microns (generalized effective size from 5 to 140 microns).
• if isubcsw > 0, call mcica_subcol() to distribute cloud properties to each g-point.

References mcica_subcol().

Referenced by rrtmg_sw_run().

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