The theoretical relationship between foliage temperature and canopy resistance in sparse crops

W. James Shuttleworth, Robert J. Gurney

Research output: Contribution to journalArticle

258 Scopus citations

Abstract

One‐dimensional, sparse‐crop interaction theory is reformulated to allow calculation of the canopy resistance from measurements of foliage temperature. A submodel is introduced to describe eddy diffusion within the canopy which provides a simple, empirical simulation of the reported behaviour obtained from a second‐order closure model. the sensitivity of the calculated canopy resistance to the parameters and formulae assumed in the model is investigated. the calculation is shown to exhibit a significant but acceptable sensitivity to extreme changes in canopy aerodynamics, and to changes in the surface resistance of the substrate beneath the canopy at high and intermediate values of leaf area index. In very sparse crops changes in the surface resistance of the substrate are shown to contaminate the calculated canopy resistance, tending to amplify the apparent response to changes in water availability. the theory is developed to allow the use of a measurement of substrate temperature as an option to mitigate this contamination.

Original languageEnglish (US)
Pages (from-to)497-519
Number of pages23
JournalQuarterly Journal of the Royal Meteorological Society
Volume116
Issue number492
DOIs
StatePublished - Jan 1 1990

ASJC Scopus subject areas

  • Atmospheric Science

Fingerprint Dive into the research topics of 'The theoretical relationship between foliage temperature and canopy resistance in sparse crops'. Together they form a unique fingerprint.

  • Cite this