Jwtype: Difference between revisions
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= | <div class="title">Jwtype</div> | ||
{{#lst:Variables|Jwtype}} | |||
---- | |||
This parameter selects amongst a set of coefficients that define the double exponential profile for shortwave radiation absorption calculated by Paulson and Simpson's ([[Bibliography#PaulsonCA_1977a|1977]]) fit to the data of Jerlov (1976). | |||
<span class="blue">WTYPE</span> ([[roms.in]]) values 1 through 5 correspond to Jerlov's classification of water types I, IA, IB, II and III, respectively. | |||
The model for the downward flux of solar radiation is: | |||
<math display="block">Q_{down}(z) = Q_{sw}( r \, \exp(z/\mu_1) + (1-r) \, \exp(z/\mu_2) )</math> | |||
where <math>Q_sw</math> is the downward shortwave radiation at the sea surface. This parameterization is implemented in [[lmd_swfrac.F]] if called for. Downward shortwave data (or an analytical value) is required as input. | |||
The parameters of this simple optical model are described and set in [[mod_scalars.F]] in the block headed "Water clarity parameters": | |||
[[Variables#lmd_mu1|lmd_mu1]] Reciprocal of the absorption coefficient for solar | |||
wavelength band 1 as a function of the Jerlov | wavelength band 1 as a function of the Jerlov | ||
water type. Units are meters. | water type. Units are meters. | ||
lmd_mu2 Reciprocal of the absorption coefficient for solar | [[Variables#lmd_mu2|lmd_mu2]] Reciprocal of the absorption coefficient for solar | ||
wavelength band 2 as a function of the Jerlov | wavelength band 2 as a function of the Jerlov | ||
water type. Units are meters. | water type. Units are meters. | ||
lmd_r1 Fraction of total radiance for wavelength band 1 as | [[Variables#lmd_r1|lmd_r1]] Fraction of total radiance for wavelength band 1 as | ||
a function of the Jerlov water type. | a function of the Jerlov water type. | ||
The values are: | The values are: | ||
Jerlov water type : I IA IB II | [[Variables#Jwtype|WTYPE]] 1 2 3 4 5 | ||
Jerlov water type : I IA IB II III | |||
| |||
lmd_mu1 | [[Variables#lmd_mu1|lmd_mu1]] 0.35 , 0.60 , 1.00 , 1.50 , 1.40 | ||
lmd_mu2 | [[Variables#lmd_mu2|lmd_mu2]] 23.00 , 20.00 , 17.00 , 14.00 , 7.90 | ||
lmd_r1 | [[Variables#lmd_r1|lmd_r1]] 0.58 , 0.62 , 0.67 , 0.77 , 0.78 | ||
Latest revision as of 15:13, 17 July 2019
Jwtype
- Jwtype
- Jerlov water type: an integer value from 1 to 5.
- option =
- routine = mod_mixing.F
- keyword = WTYPE
- input = roms.in
This parameter selects amongst a set of coefficients that define the double exponential profile for shortwave radiation absorption calculated by Paulson and Simpson's (1977) fit to the data of Jerlov (1976).
WTYPE (roms.in) values 1 through 5 correspond to Jerlov's classification of water types I, IA, IB, II and III, respectively.
The model for the downward flux of solar radiation is:
where is the downward shortwave radiation at the sea surface. This parameterization is implemented in lmd_swfrac.F if called for. Downward shortwave data (or an analytical value) is required as input.
The parameters of this simple optical model are described and set in mod_scalars.F in the block headed "Water clarity parameters":
lmd_mu1 Reciprocal of the absorption coefficient for solar wavelength band 1 as a function of the Jerlov water type. Units are meters. lmd_mu2 Reciprocal of the absorption coefficient for solar wavelength band 2 as a function of the Jerlov water type. Units are meters. lmd_r1 Fraction of total radiance for wavelength band 1 as a function of the Jerlov water type.
The values are:
WTYPE 1 2 3 4 5 Jerlov water type : I IA IB II III lmd_mu1 0.35 , 0.60 , 1.00 , 1.50 , 1.40 lmd_mu2 23.00 , 20.00 , 17.00 , 14.00 , 7.90 lmd_r1 0.58 , 0.62 , 0.67 , 0.77 , 0.78
