Turbulent variance characteristics of temperature and humidity over a non-uniform land surface for an agricultural ecosystem in China
Gao, Z., Bian, L., Chen, Z., Sparrow, M. and Zhang, J. (2006) Turbulent variance characteristics of temperature and humidity over a non-uniform land surface for an agricultural ecosystem in China. Advances in Atmospheric Sciences, 23, (3), 365-374. (doi:10.1007/s00376-006-0365-y).
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This paper describes the application of the variance method for flux estimation over a mixed agricultural region in China. Eddy covariance and flux variance measurements were conducted in a near-surface layer over a non-uniform land surface in the central plain of China from 7 June to 20 July 2002. During this period, the mean canopy height was about 0.50 m. The study site consisted of grass (10% of area), beans (15%), corn (15%) and rice (60%). Under unstable conditions, the standard deviations of temperature and water vapor density (normalized by appropriate scaling parameters), observed by a single instrument, followed the Monin-Obukhov similarity theory. The similarity constants for heat (CT ) and water vapor (Cq) were 1.09 and 1.49, respectively. In comparison with direct measurements using eddy covariance techniques, the flux variance method, on average, underestimated sensible heat flux by 21% and latent heat flux by 24%, which may be attributed to the fact that the observed slight deviations (20% or 30% at most) of the similarity “constants” may be within the expected range of variation of a single instrument from the generally-valid relations.
|Keywords:||turbulent fluxes, eddy covariance, flux variance, non-uniform land surface|
|Subjects:||Q Science > Q Science (General)|
|Divisions:||University Structure - Pre August 2011 > National Oceanography Centre (NERC)
|Date Deposited:||12 Feb 2007|
|Last Modified:||21 Aug 2013 14:31|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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