n concentration of chlorophyll a contained in algae, mole/m3 



P laser output power, W 



P r power received by detector, W 



R distance from laser fluorosensor system to surface of water, m 



X matrix of elements x-^ 



x^ defined in equation (10) 



z water depth of differential volume under examination, m 



a single-scattering attenuation coefficient, m~ 1 



B atmospheric extinction coefficient, m~ 1 



Y effective attenuation coefficient of water, m~^ 



AX wavelength bandwidth, nm 



Gji matrix elements of Z~^ 



X wavelength, nm 



£ optical efficiency of receiver system 



p water surface reflectivity 



£ matrix of elements a^j 



a cross section for fluorescence at 685 nm per chlorophyll a molecule 

 contained in algae when excited by laser wavelength X^, m^/mole 



CJij = Ojtti) 



Subscripts: 



d detector 



f fluorescence, or at fluorescence wavelength, 685 nm 



i laser excitation wavelength corresponding to four algal color groups 



j four algal color groups 



2. laser, or at laser excitation wavelength 



