MSC 316 Lecture Notes - Lecture 6: Sensible Heat, Anemometer, Main Source
13 Sep 2016
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Document Summary
Light: human photopic response: what we see. Units are ft-candles or lux where 10 lux = 1ft-c. Used to evaluate lighting for human habitation. Full daylight versus light at dusk are very different. Huge difference in light intensity: photosynthesis. Conversion of light energy to stored chemical energy. Calorie = energy it takes to raise 1g water 1degree c. 1cal cm-2 min-1 = 1 langley = 697. 8 watts m-2. Number of photons that come in to one square meter over the interval of one minute. 1 ueinstein = 6. 02 x 10^17 photons. Sensor can tell angle and wavelength of light that comes in at each time of day. Plants are fairly similar in response as an ideal sensor. A par sensor facing upward only is okay for terrestrial ecosystems. To collect all data in the ocean, there must be an upward facing par sensor and a downward facing par sensor. Field methods for measuring terrestrial primary production.
