Correlated humidity and temperature measurements in the urban atmospheric boundary layer |
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| Authors: | F C Medeiros Filho D A R Jayasuriya R S Cole C G Helmis D N Asimakopoulos |
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| Institution: | (1) Present address: Department of Electronic and Electrical Engineering, University College London, Torrington Place, W. C. 1 London, England;(2) Present address: Department of Applied Physics, University of Athens, Ippokratus 33, 10680 Athens, Greece |
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| Abstract: | Summary To investigate the effect of atmospheric turbulence on microwave communication links, temperature and water vapor pressure have been measured and radio refractivity has been computed, during different meteorological conditions, in the atmospheric boundary layer of an urban site. The cospectra between temperature (T) and water vapor pressure (e) have been found to be either negative over the whole range of frequencies, or the low-frequency end of the cospectrum is of opposite sign relative to higher frequency end. In both cases cospectra follow a–5/3 law in the inertial subrange, in agreement with the theoretical predictions. The coherence spectra clearly show that the temperature and humidity fluctuations are highly coherent within the inertial subrange under both convective and stable conditions. The relative contribution ofC
T
2
,C
eT
andC
e
2
to the real refractive index structure parameterC
n
2
is examined and discussed.With 4 Figures |
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