Effect of stability correction on remote sensing estimates of near-noon sensible heat flux of alfalfa and tall fescue grass

Payero, J. O., Neale, C. M. U. and Wright, J. L. (2006) Effect of stability correction on remote sensing estimates of near-noon sensible heat flux of alfalfa and tall fescue grass. International Journal of Remote Sensing, 27 2: 307-328.


Author Payero, J. O.
Neale, C. M. U.
Wright, J. L.
Title Effect of stability correction on remote sensing estimates of near-noon sensible heat flux of alfalfa and tall fescue grass
Journal name International Journal of Remote Sensing   Check publisher's open access policy
ISSN 0143-1161
1366-5901
Publication date 2006-06-20
Sub-type Article (original research)
DOI 10.1080/01431160500222657
Volume 27
Issue 2
Start page 307
End page 328
Total pages 22
Place of publication Colchester, Essex, United Kingdom
Publisher Taylor & Francis
Language eng
Formatted abstract Sensible heat flux (H) can be an important component of the energy balance of earth surfaces, especially under dry soil conditions and incomplete canopy cover. Estimating H from remote sensing often requires correcting for atmospheric stability to account for the effect of buoyancy, and several simplified methods have been used to make this correction. In this study, data collected from alfalfa and tall fescue grass fields at Kimberly, Idaho, were used to: (1) determine how near-noon values of stability-corrected aerodynamic resistance for heat transfer (rahc) calculated with seven different methods compared with those obtained using a standard micrometeorological method, (2) determine whether the method used to calculate rahc had a significant effect on near-noon H calculated using a remote sensing resistance model, and (3) assess the validity of the remote sensing model for determining near-noon H. It was found that discrepancies in rahc between methods, compared with the standard method, increased for low wind speeds (u2) (u2<2ms-1), and there was good agreement for five of the seven methods compared for u2>2ms-1. Those five methods also had good agreement with the standard method when they were used to calculate near-noon H for both surfaces. The agreement was good even for low u2, despite the disagreement in rahc at low u2. The other two methods were well correlated with the standard method, but showed significant bias. It was also found that near-noon H values obtained from remote sensing were well correlated with Bowen ratio measurements but were statistically different from each other for both surfaces.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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