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Length Scale Analysis of Surface Energy Fluxes Derived from Remote Sensing
Brunsell, Nathaniel A. Gillies, Robert R.
Brunsell, Nathaniel A.
Gillies, Robert R.
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Abstract
Wavelet multiresolution analysis was used to examine the variation in dominant length scales determined
from remotely sensed airborne- and satellite-derived surface energy flux data. The wavelet cospectra are computed
between surface radiometric temperature, fractional vegetation, and derived energy fluxes at airborne (12 m)
and Advanced Very High Resolution Radiometer (AVHRR) (1000 m) resolutions. Length scale analysis of highresolution
data shows that small-scale variability in temperature dominates over other effects. Analysis of coarseresolution
data shows that small-scale variations in vegetation are important, although the large-scale variation
in radiometric temperature dominates the derived fluxes. This is determined to be a result of the fact that, at
smaller scales, the incoming solar radiation effect is muted by the small-scale variability in vegetation, temperature,
and albedo, whereas at coarser scales, the large-scale effect of incoming radiation on temperature
dominates over the smaller-scale features in surface variability.
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Date
2003
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American Meteorological Society
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Brunsell, N. A. and R. R. Gillies: 2003, Length scale analysis of surface energy uxes derived from remote sensing. Journal of Hydrometeorology, 4, 1212-1219. http://dx.doi.org/10.1175/1525-7541(2003)004<1212:LSAOSE>2.0.CO;2