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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Description/Abstract
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.
| Item Type: | Article |
|---|---|
| ISSNs: | 0256-1530 (print) |
| Related URLs: | |
| 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) |
| Item ID: | 44082 |
| Date Deposited: | 12 Feb 2007 |
| Last Modified: | 01 Jun 2011 00:09 |
| Contributors: | Gao, Z. (Author) Bian, L. (Author) Chen, Z. (Author) Sparrow, M. (Author) Zhang, J. (Author) |
| Date: | 2006 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/44082 |
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