Influence of Leaf Area Index on the Radiometric Resistance to Heat Transfer

Lei Zhao, Xuhui Lee, Andrew E. Suyker, Xuefa Wen

Research output: Contribution to journalArticlepeer-review

Abstract

Sensible heat flux is an important component of the surface energy balance. Land surface models often use the radiative surface temperature instead of the aerodynamic temperature to predict the surface sensible flux, because the former is much easier to observe by remote sensing or to compute from the surface energy balance equation. Here, measurements from 44 FLUXNET sites are used to examine the stability and leaf area index (LAI) dependence of the radiometric resistance, a resistance that should be included in the bulk transfer method if the radiometric temperature is used for the flux calculation. Results show that the radiometric resistance is much higher under stable conditions than under unstable conditions. In unstable conditions, the radiometric resistance is highly sensitive to LAI, decreasing exponentially as LAI increases. Omission of the radiometric resistance from the bulk transfer method causes a large overestimation in the sensible heat flux, especially for low-LAI surfaces and under unstable conditions.

Original languageEnglish (US)
Pages (from-to)105-123
Number of pages19
JournalBoundary-Layer Meteorology
Volume158
Issue number1
DOIs
StatePublished - Jan 1 2016

Keywords

  • Aerodynamic temperature
  • Leaf area index
  • Radiative surface temperature
  • Radiometric resistance
  • Sensible heat flux

ASJC Scopus subject areas

  • Atmospheric Science

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