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Variation of Surface Air Temperature in Complex Terrain

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Abstract
  • Data from three micronetworks with eddy correlation data and three additional micronetworks without eddy correlation data are analyzed to study the spatial variability of surface air temperature in complex terrain. A simple similarity relationship is constructed to relate the spatial variation of air temperature along the slope to the thermal forcing and mixing. Mixing is not included in present empirical formulations of the surface air temperature distribution in complex terrain. The development of surface temperature gradients along the slope, resulting from surface heating or cooling, is bounded by a maximum (or saturated) value, where a further increase of temperature gradients is restricted by redistribution of heat by thermally driven slope circulations. Although much of the spatial variation of the surface air temperature is governed by complex three-dimensionality and surface vegetation, a relatively simple relationship is able to account for much of the diurnal and day-to-day variation of the spatial distribution of air temperature. This relationship requires information on the surface heat flux and friction velocity over a reference surface. Required generalizations of the relationship are outlined before it can be applied to an arbitrary site.
  • Keywords: Complex terrain, Orographic effects, Temperature, Surface layer, Mountain meteorology
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  • Mahrt, L., 2006: Variation of Surface Air Temperature in Complex Terrain. Journal of Applied Meteorology and Climatology, 45, 1481–1493.
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  • 45
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  • 11
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  • This material is based upon work supported by Contract W911NF-05-C-0067 from the Army Research Office and Grant 0107617-ATM from the Physical Meteorology Program of the National Sciences Program.
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