Comparison of Turbulent Sensible Heat Flux Determined by Large-Aperture Scintillometer and Eddy Covariance over Urban and Suburban Areas

Field observations of the atmospheric boundary layer were made over urban and suburban areas in the Yangtze River Delta, China. Sensible heat fluxes were obtained by eddy-covariance (EC) systems and large-aperture scintillometers (LASs). The results indicated that (1) the sensible heat flux obtained...

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Bibliographic Details
Published in:Boundary-layer meteorology 2015-01, Vol.154 (1), p.119-136
Main Authors: Zhang, He, Zhang, Hongsheng
Format: Article
Language:English
Subjects:
Analysis
Atmospheric boundary layer
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Boundaries
Boundary layers
China
Comparative studies
Correlation coefficient
Earth and Environmental Science
Earth Sciences
Enthalpy
Fluctuations
Flux
Marine
Meteorology
Planetary boundary layer
Scintillation counters
Sensible heat
Suburban areas
Texts
Turbulence
Urban areas
Wind speed
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Summary:Field observations of the atmospheric boundary layer were made over urban and suburban areas in the Yangtze River Delta, China. Sensible heat fluxes were obtained by eddy-covariance (EC) systems and large-aperture scintillometers (LASs). The results indicated that (1) the sensible heat flux obtained by LAS ( H LAS ) was less noisy and slightly larger than that obtained by EC ( H EC ) over both urban and suburban surfaces; (2) the values of H LAS / H EC were higher when the correlation coefficient of vertical wind speed and temperature ( r w T ) was smaller. Lower values of r w T were due to low-frequency trends. The urban values of H LAS / H EC were smaller than suburban values at low r w T values; (3) the sensible heat flux determined by LAS was improved by use of the Monin–Obukhov similarity theory of the temperature structure parameter ( ϕ CT ) over urban and suburban areas, and the improvement is more significant over urban surface areas.
ISSN:0006-8314
1573-1472
DOI:10.1007/s10546-014-9965-8