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SILICON PHOTODIODES: With this instrumentation, radiation
transmittance (ratio of transmitted to incident radiation)
through clear ice, refrozen slush ice and brash ice, from ice
surface to ice water interface in 400 to 600 nanometer range
(photosynthetically active range), was measured at two
freshwater lakes. Data taken with this included surface and
under-ice sensor readings, date and time of observation, solar
angle, ice thickness, water depth, distance of under-ice sensor
from ice bottom surface, and site number/location.