The effect of slope-aspect on turbulent transfer in an alpine fellfield: Niwot ridge, front range, colorado

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Abstract

This study investigates the impact of local convergence and divergence of air on turbulent transfer at a mid-latitude alpine fellfield site. Pairs of simultaneous wind and temperature profile measurements on a knoll crest and primary slope (aspect =0, 90, 180, and 270°) are analyzed assuming the logarithmic law. Friction velocity (u) and roughness length (z0) vary systematically from windward to leeward slopes. General relationships of the form u = f(u) are derived for conditions of westerly flow with wind speed (u) ranging between 2 and 24 m s-1. Coefficients in the empirical equations for estimating u at sites on the knoll from wind speed measurements on the crest vary in a consistent manner with respect to local convergence and divergence. Large differences in z0 values between windward and leeward sites correspond with contrasts in surface temperature.

Original languageEnglish (US)
Pages (from-to)133-147
Number of pages15
JournalPhysical Geography
Volume8
Issue number2
DOIs
StatePublished - Jan 1 1987

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Earth and Planetary Sciences(all)

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