Extinction Coefficient calculations


Rough calculation using secci disc:
k = 1.45 / d
where;
k = extinction coefficient
d = depth at which secchi disc is still visible to naked eye
 
May also be expressed as;
k = (2.3 x (log Id1- log Id2)) / (d2 - d1)
where;   
k = extinction coefficient
Id1= Intensity of light (of a specific wavelength) at depth "d1"
Id2= Intensity of light (of a specific wavelength) at depth "d2"