Difference between revisions of "Jwtype"

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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).
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> ([[ocean.in]]) values 1 through 5 correspond to Jerlov's classification of water types  I, IA, IB, II and III, respectively.
<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:
The model for the downward flux of solar radiation is:


  <math>Q_{down}(z) = Q_{sw}( r \, \exp(z/\mu_1) + (1-r) \, \exp(z/\mu_2) ) </math>
<math display="block">Q_{down}(z) = Q_{sw}( r \, \exp(z/\mu_1) + (1-r) \, \exp(z/\mu_2) )</math>


where ''Q_sw'' 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.  
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":
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
     [[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:


     WTYPE                1      2       3      4      5
     [[Variables#Jwtype|WTYPE]]               1      2       3      4      5
     Jerlov water type :  I      IA      IB      II     III
     Jerlov water type :  I      IA      IB      II     III
      
     &nbsp;
       lmd_mu1           0.35 ,  0.6  ,  1.0  ,  1.5  ,  1.4  
       [[Variables#lmd_mu1|lmd_mu1]]            0.35 ,  0.60 ,  1.00 ,  1.50 ,  1.40  
       lmd_mu2         23.0  , 20.0  , 17.0  , 14.0  ,  7.9  
       [[Variables#lmd_mu2|lmd_mu2]]          23.00 , 20.00 , 17.00 , 14.00 ,  7.90  
       lmd_r1           0.58 ,  0.62 ,  0.67 ,  0.77 ,  0.78
       [[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
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