Topographic distribution of clear‐sky radiation over the Konza Prairie, Kansas

Topographic distribution of clear‐sky radiation over the Konza Prairie, Kansas This research analyzes the topographic distribution of clear‐sky incoming solar radiation over the tallgrass Konza Prairie, site of FIFE, the First ISLSCP (International Satellite Land Surface Climatology Program) Field Experiment. Using a two‐stream atmospheric radiation model and digital elevation grids of 25‐, 50‐, and 100‐m grid spacing, clear‐sky radiation is simulated throughout the day for three dates: December 15, March 15, and June 15. Geostatistical analysis is used to characterize the spatial and temporal variability in modeled radiation at each grid spacing. The variance and spatial autocorrelation of simulated incoming radiation depend on Sun angle and elevation grid spacing. The behavior of the variance as a function of Sun angle, optical depth, and mean terrain slope can be explained by considering direct radiation variability on a simplified terrain model of uniform albedo where slopes are equal and azimuths are distributed uniformly in all directions. For this constant‐slope model it can be shown analytically that the solar zenith angle at which variance is maximized is a function of optical depth only and is independent of elevation, slope, and aspect. Results from the two‐stream simulations support this conclusion and suggest its applicability to real terrain. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

Topographic distribution of clear‐sky radiation over the Konza Prairie, Kansas

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Publisher
Wiley
Copyright
Copyright © 1990 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
DOI
10.1029/WR026i004p00679
Publisher site
See Article on Publisher Site

Abstract

This research analyzes the topographic distribution of clear‐sky incoming solar radiation over the tallgrass Konza Prairie, site of FIFE, the First ISLSCP (International Satellite Land Surface Climatology Program) Field Experiment. Using a two‐stream atmospheric radiation model and digital elevation grids of 25‐, 50‐, and 100‐m grid spacing, clear‐sky radiation is simulated throughout the day for three dates: December 15, March 15, and June 15. Geostatistical analysis is used to characterize the spatial and temporal variability in modeled radiation at each grid spacing. The variance and spatial autocorrelation of simulated incoming radiation depend on Sun angle and elevation grid spacing. The behavior of the variance as a function of Sun angle, optical depth, and mean terrain slope can be explained by considering direct radiation variability on a simplified terrain model of uniform albedo where slopes are equal and azimuths are distributed uniformly in all directions. For this constant‐slope model it can be shown analytically that the solar zenith angle at which variance is maximized is a function of optical depth only and is independent of elevation, slope, and aspect. Results from the two‐stream simulations support this conclusion and suggest its applicability to real terrain.

Journal

Water Resources ResearchWiley

Published: Apr 1, 1990

References

  • A clear‐sky spectral solar radiation model for snow‐covered mountainous terrain
    Dozier, Dozier
  • An approach toward energy balance simulation over rugged terrain
    Dozier, Dozier; Outcalt, Outcalt
  • Semi‐variograms for modelling the spatial pattern of landform and soil properties
    Oliver, Oliver; Webster, Webster

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