By David H. Miller
Strength on the floor of the Earth: An creation to the Energetics of Ecosystems (International Geophysics sequence) [Paperback] [May 28, 1981] Miller, David H. ... 0124971520
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Extra info for Energy at the Surface of the Earth: An Introduction to the Energetics of Ecosystems
The rising and setting of the summer sun far poleward of east and west brings light in north windows and onto the north edges of forest bodies. The rate of change in azimuth varies slightly during the day, but not 36 111. DIRECT SOLAR RADIATION 180 S Fig. 2. Paths of the sun across the sky at different seasons at 45"N latitude. The reader is invited to take a mental position at the center of the diagram and orient it. Then at the summer solstice the sun rises to your right, in the northeast at azimuth 55", and travels along path A.
1. 0 pm. 2. 70 pm. 3. 61 p m 4. 51 pm. 5. 41 wm. 6. 315 pm. 29 of total flux. 22 of total flux (bands 1 and 2 make up the solar infrared) Strongly absorbed by chlorophyll (the red region) and manifests greatest quantum efficiency in photosynthesis (Milthorpe and Moorby, 1979, p. 07 of total, but less studied than UV-B (Silberglied, 1979) * The exact figure is not yet certain. , 1980). NATURE AND SIGNIFICANCE OF THE SOLAR BEAM 7. 280 pm. 8. 28 pm. 005 of total flux from the sun* From the ecological standpoint it makes sense to divide the solar spectrum into infrared, visible, and ultraviolet regions, bands 1-2, 3-5, and 6-8, respectively.
A change in ventilation, for instance, results in compensating changes in energy and mass exchanges and in air temperature and humidity in each layer. Much modeling of ecosystem processes makes use of onedimensional profiles in which radiation, vapor, and C 0 2are passed from layer to layer. 8 m2 m p 2 . 3. 2 (Rauner, 1976). Leaf angle affects the entry of radiation into an ecosystem, and so it has to be measured and modeled also. Vertical leaves present active surfaces at the most effective angles to the direct solar beam when the sun is low in the sky (Anderson and Denmead, 1969); see Table I.
Energy at the Surface of the Earth: An Introduction to the Energetics of Ecosystems by David H. Miller