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Turbulent variance characteristics of temperature and humidity over a non-uniform land surface for an agricultural ecosystem in China

Record type: Article

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.

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Citation

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), pp. 365-374. (doi:10.1007/s00376-006-0365-y).

More information

Published date: 2006
Keywords: turbulent fluxes, eddy covariance, flux variance, non-uniform land surface

Identifiers

Local EPrints ID: 44082
URI: http://eprints.soton.ac.uk/id/eprint/44082
ISSN: 0256-1530
PURE UUID: eb8d729b-03a9-4515-8665-6073aed87f31

Catalogue record

Date deposited: 12 Feb 2007
Last modified: 17 Jul 2017 15:16

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Contributors

Author: Z. Gao
Author: L. Bian
Author: Z. Chen
Author: M. Sparrow
Author: J. Zhang

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