Measuring photosynthetically active radiation (PAR) with depth
Автор: Walter Dodds Freshwater Ecology
Загружено: 2020-08-14
Просмотров: 192
Описание:
A light sensor is use to measure light energy in the range of 400-700 nm that is available for photosynthesis. The units are micromol quanta/ m2/s. The light is attenuated on a logarithmic fashion. The sensor is cosine corrected to account for the angle of the sun. The measurement is made off the sunny side of the boat.
transcript:
This is a PAR sensor: Photosynthetically Active Radiation, it has a cosine corrected sensor on the end of it, we'll do this measurement on the sunny side of the boat, to see how deep light goes for photosynthesis. First thing I have to do though is find the multiplier, because each calibrated probe has a multiplier in the probe that it uses. I'm just gonna lower it and call out the numbers as we get to depth. First measurement is the surface measurement, right under the surface of the water.... 1 m 802, 2 m 518, 3 m 203, so we see this is falling off logarithmically... at 4m 107, 5m 47.
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