Effect of temperature on functional groups
Parameters effected
The temperature in the current box-layer effects the following functional group attributes:
KI - Light Saturation
C - Clearance Rates
mL- linear mortality
mQ - quadratic mortality
mS - Extra macrophyte mortality (based on physical environment)
Each of these attributes is in the biology input file. These values typically have the name similar to KI_PL_T15 which indicates that its the value of the attribute at 15 degrees C.
These parameters are then corrected based on the difference between the current temperature and 15 deg C.
So the value that is actually used for each of these attributes is:
value = T15_value * Tcorr.
Calculating the TCorr value for each functional group
There are a number of options for calculating the TCorr value for each functional group. Temperature correction will only occur if the ‘flagq10’ flag is ‘on’ in your biology input file.
There are two methods for calculating the TCorr value for each functional group and the method is specified in the q10_method_ value for each functional group.
Method 1:
This is used if the q10_method_ value for the functional group is not set (default value is 0) or is set to 0 in the input file.
current_corr = (current_temp - 15.0)/10.0
Tcorr = Group_Q10^current_corr;
Where the Group_Q10 value is the FLAG_Q10 value read in from the biology input file. If you don’t specify a value for a functional group the default Q10 value is used.
Method 2:
The Gary Griffith method (Griffith et al (2010) )
Warning: This is still being tested and is pretty hypothetical.
Tcorr=log(2)0.851(1.066.^T_i).*exp(-((abs(T_i-T_opt)).^3)./Tcorrection);
Where:
T_opt = the q10_optional_temp_ value read in from the biology functional group for this functional group.
Tcorrection = q10_correction_ read in from the biology input file for this functional group.
T_i = current tempertaure
Note if the q10_method_ is 0 (or not specified) for a functional group then the q10_optional_temp_ and q10_correction_ values are not read in from the biology input file.
The attached spreadsheet shows the results of this method on the ZG functional group.