Through the ice, wire-walking profilers (McLane Labs Ice Tethered Profilers [ITPs]) were deployed in both lobs of Lake Bonney. Attached to the ITPs was a photosynthetically active radiation sensor (Biospherical instruments Model QCP23000). The ITPs were programmed to profile once daily around regional solar noon. A profile consisted of one downward and one upward movement to the furthest reach of the profilers possible movement, or the bottom of the lake or bottom of the ice, whichever limit came first. During the profiles, conductivity, temperature, salinity and dissolved oxygen readings were recorded every 10 seconds. To convert the raw sensor readings (recorded in sensor output units, millivolts), manufacturer calibration coefficients and fit equations were used.