Download PDF by Gaylon S. Campbell: An Introduction to Environmental Biophysics

By Gaylon S. Campbell

Reviews of the 1st edition:
"an attention-grabbing precis of many attention-grabbing principles in environmental physics and biology" American Scientsist
"well prepared ... prompt as an introductory textual content for undergraduates" AAAS technology Books and Films
"well written and illustrated" Bulletin of the yankee Meteorological Society

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The growing region of the plant is at air temperat\1re 2. the hourly air temperature does not go below the base temperature or above the maximum temperature during a day 3. the process being predicted is linear with temperature between the base and maximum temperatures. t, is taken as one day. The progress toward completion ofa developmental stage is reported in day-degrees above a specified base temperature. Day-degrees required for completion ofa developmental stage are used to determine completion or progress toward completion of development.

5), by dividing es (T) by the atmospheric pressure. The main variable determining atmo- 8 7 'iii' 6 -! 5 <4 <4 4 ll. -'" ::::0 at a: ~ 3 a. III > 2 o o 10 20 30 Temperature (0) FIGURE 3-1. Saturation vapor pressure of air as a function of temperature. 40 41 Water Vapor: Saturation Conditions spheric pressure is elevation. 7) where A is the altitude in meters above sea level and Pa is in kPa. 8) where T is the Celsius temperature. The constants a, b, and e can be chosen to optimize the fit of the equation for various ranges of data.

4 are particularly interesting because they reflect the mechanism for heat transport in the lower atmosphere, and are responsible for some interesting optical phenomena in the atmosphere. Since heat transfer in air is mainly by convection, or transport ofparcels of hot or cold air, we might expect the air temperature at any instant to Random Temperature Variation 19 31 30 - 29 - ยง: ... 4. Air temperature 2 m above a desert surface at White Sands Missile Range, NM. Measurements were made near midday using a 25 tIm diameter thermocouple.

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