Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..595h&link_type=abstract
Geophysical Research Letters, vol. 8, June 1981, p. 595-598.
Physics
2
Diurnal Variations, Elevation, Sky Radiation, Solar Flux, Solar Terrestrial Interactions, Surface Temperature, Earth Surface, Photointerpretation, Radiance, Radiation Effects, Solar Heating, Temperature Gradients, Thermal Mapping
Scientific paper
The magnitude of elevation effects due to changes in solar and sky fluxes, on interpretation of single thermal images and composite products such as temperature difference and thermal inertia, are examined. Simple expressions are derived for the diurnal behavior of the two parameters, by fitting field observations in one tropic (Hawaii) and two semi-arid climates (Wyoming and Colorado) (Hummer-Miller, 1981). It is shown that flux variations with elevation can cause changes in the mean diurnal temperature gradient from -4 to -14 degrees C/km, evaluated at 2000 m. Changes in the temperature-difference gradient of 1 to 2 degrees C/km are also produced which is equivalent to an effective thermal-inertia gradient of 100 W s(exp 1/2)/sq m-K-km. An example is presented showing an elevation effect of 12 degrees C on the day and night thermal scenes of a test site in Arizona.
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