Estimation of urban sensible heat flux using a dense wireless network of observations |
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Authors: | Daniel F Nadeau W Brutsaert M B Parlange E Bou-Zeid G Barrenetxea O Couach M-O Boldi J S Selker M Vetterli |
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Institution: | (1) School of Atmospheric Sciences, Nanjing University, Nanjing, 210093, People’s Republic of China |
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Abstract: | The determination of the sensible heat flux over urban terrain is challenging due to irregular surface geometry and surface
types. To address this, in 2006–07, a major field campaign (LUCE) took place at the école Polytechnique Fédérale de Lausanne
campus, a moderately occupied urban site. A distributed network of 92 wireless weather stations was combined with routine
atmospheric profiling, offering high temporal and spatial resolution meteorological measurements. The objective of this study
is to estimate the sensible heat flux over the built environment under convective conditions. Calculations were based on Monin–Obukhov
similarity for temperature in the surface layer. The results illustrate a good agreement between the sensible heat flux inferred
from the thermal roughness length approach and independent calibrated measurements from a scintillometer located inside the
urban canopy. It also shows that using only one well-selected station can provide a good estimate of the sensible heat flux
over the campus for convective conditions. Overall, this study illustrates how an extensive network of meteorological measurements
can be a useful tool to estimate the sensible heat flux in complex urban environments. |
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