You can find information on both incident solar radiation and
transmittance of light by natural waters in the book:
"Light and photosynthesis in aquatic ecosystems" by J.T.O. Kirk
published by Cambridge University Press, original edition 1983
and a new edition due soon
Pat Neale
-------------------------------------------------------------------
Patrick Neale
Smithsonian Environmental Research Center
P.O. Box 28
Edgewater MD 21037 410-798-4424 FAX 301-261-7954
