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CCPP Scientific Documentation
v5.0.0
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CCPP Scientific Documentation
v5.0.0
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This module contains cloud radiative property coefficients. More...
Variables | |
updated Hu and Stamnes (1993) coef for cloud liquid condensate (used if iswcliq=2) | |
| real(kind=kind_phys), dimension(58, nblow:nbhgh), public | extliq1 |
| extinction coefficients More... | |
| real(kind=kind_phys), dimension(58, nblow:nbhgh), public | extliq2 |
| extinction coefficients More... | |
| real(kind=kind_phys), dimension(58, nblow:nbhgh), public | ssaliq1 |
| single scattering albedo coefficients More... | |
| real(kind=kind_phys), dimension(58, nblow:nbhgh), public | ssaliq2 |
| extinction coefficients More... | |
| real(kind=kind_phys), dimension(58, nblow:nbhgh), public | asyliq1 |
| asymmetry coefficients More... | |
| real(kind=kind_phys), dimension(58, nblow:nbhgh), public | asyliq2 |
| extinction coefficients More... | |
Streamer V3 (Key 2002) coefficients for cloud ice condensate (used if iswcice=2) | |
| real(kind=kind_phys), dimension(43, nblow:nbhgh), public | extice2 |
| extinction coefficients More... | |
| real(kind=kind_phys), dimension(43, nblow:nbhgh), public | ssaice2 |
| single scattering albedo coefficients More... | |
| real(kind=kind_phys), dimension(43, nblow:nbhgh), public | asyice2 |
| asymmetry coefficients More... | |
Fu(1996) coefficients for cloud ice condensate (used if iswcice=3) | |
| real(kind=kind_phys), dimension(46, nblow:nbhgh), public | extice3 |
| extinction coefficients More... | |
| real(kind=kind_phys), dimension(46, nblow:nbhgh), public | ssaice3 |
| single scattering albedo coefficients More... | |
| real(kind=kind_phys), dimension(46, nblow:nbhgh), public | asyice3 |
| asymmetry coefficients More... | |
| real(kind=kind_phys), dimension(46, nblow:nbhgh), public | fdlice3 |
| fdelta from fu, unitless More... | |
Ebert and Curry (1992) coefficients for cloud ice condensate (used if iswcice=1) | |
| real(kind=kind_phys), dimension(5), public | abari |
| extinction coefficients More... | |
| real(kind=kind_phys), dimension(5), public | bbari |
| extinction coefficients More... | |
| real(kind=kind_phys), dimension(5), public | cbari |
| single scattering albedo coefficients More... | |
| real(kind=kind_phys), dimension(5), public | dbari |
| single scattering albedo coefficients More... | |
| real(kind=kind_phys), dimension(5), public | ebari |
| asymmetry coefficients More... | |
| real(kind=kind_phys), dimension(5), public | fbari |
| asymmetry coefficients More... | |
Fu (2001, personal communications) coefficients for cloud snow particles | |
| real(kind=kind_phys), public | a0s |
| optical depth coefficients More... | |
| real(kind=kind_phys), public | a1s |
| optical depth coefficients More... | |
| real(kind=kind_phys), dimension(nblow:nbhgh), public | b0s |
| single scattering albedo coefficients More... | |
| real(kind=kind_phys), dimension(nblow:nbhgh), public | b1s |
| optical depth coefficients More... | |
| real(kind=kind_phys), dimension(nblow:nbhgh), public | c0s |
| asymmetry coefficients More... | |
Chou(1999) coefficients for cloud rain particles | |
| real(kind=kind_phys), public | a0r |
| optical depth coefficients More... | |
| real(kind=kind_phys), public | a1r |
| optical depth coefficients More... | |
| real(kind=kind_phys), dimension(nblow:nbhgh), public | b0r |
| single scattering albedo coefficients More... | |
| real(kind=kind_phys), dimension(nblow:nbhgh), public | c0r |
| asymmetry coefficients More... | |
For liquid water clouds, cloud radiative property coefficients are derived from [91]. For ice clouds, there are various choices for model applications, including data tables derived from [43], from the Streamer scheme [98], or from [60] . Components of snow particles and rain droplets are not parameterized in the operational NEMS/GSM cloud microphysics scheme, and their radiative properties are neither well established yet. Coefficients for those components listed in the module are more experimental oriented that include the entries for snow from Fu (2001, personal communications), and for rain from [36].
In common practices, the cloud radiative properties (optical depth, single scattering albedo, and asymmetry factor) are usually parametized in the form of a truncated Laurent series (generalized Taylor series)
\[ f(x)=\sum_{n=-N}^Na_{n}(x-c)^n \]
Where \(x\) represents the cloud particle's effective radius (in Fu's scheme, it is called as generalized size parameter) in unites of micro-meters, \(a_{n}\) represents the corresponding coefficients, and the constant \(c\) will be zero. The number of terms, \(n\), are usually kept small, such as \(n=0,-1\) for the extinction coefficients and \(n=0,1,2\) (or a bit larger) for the coefficients of single scattering albedo and asymmetry factor. When using the Ebert and Curry cloud optical property scheme, cloud optical properties are computed 'on the fly' by using the power series in five broad spectral bands (similar expressions are used for Fu's snow and Chou's rain schemes). While for other schemes, optical properties are precomputed for each of the 14 RRTMG-SW bands in corresponding to evenly distributed particle effective radius (e.g. 1 or 3 micro-meter intervals for water or ice clouds, respectively). Simple linear interpolations will be used during radiative transfer calculations.
1.8.11