TwoBandPhotosyntheticallyActiveRadiation default parameters

Name	Value
`water_red_attenuation`	0.225
`water_blue_attenuation`	0.0232
`chlorophyll_red_attenuation`	0.037
`chlorophyll_blue_attenuation`	0.074
`chlorophyll_red_exponent`	0.629
`chlorophyll_blue_exponent`	0.674
`pigment_ratio`	0.7
`phytoplankton_chlorophyll_ratio`	1.31
`surface_PAR`	#3