Guidelines for validating Bowen ratio data

Payero, J. O., Neale, C. M. U., Wright, J. L. and Allen, R. G. (2003) Guidelines for validating Bowen ratio data. Transactions of the Asae, 46 4: 1051-1060.

Author Payero, J. O.
Neale, C. M. U.
Wright, J. L.
Allen, R. G.
Title Guidelines for validating Bowen ratio data
Journal name Transactions of the Asae   Check publisher's open access policy
ISSN 0001-2351
Publication date 2003-07
Sub-type Article (original research)
Volume 46
Issue 4
Start page 1051
End page 1060
Total pages 10
Language eng
Abstract For a variety of reasons, the measurement of latent heat flux using the Bowen ratio method can sometimes result in erroneous data. This study provides guidelines for detecting erroneous Bowen ratio data and illustrates the application of these guidelines by comparing Bowen ratio and lysimeter data collected over grass and alfalfa in southern Idaho. Errors in net radiation were detected by comparing measured with theoretical values. However, it was found that good theoretical procedures to validate soil heat flux data are lacking. Only empirical equations mainly used for remote sensing applications to obtain estimates close to noontime are available. Extremely inaccurate latent heat fluxes were easily filtered out by rejecting data when the calculated Bowen ratio (β) values were close to -1. A simplified procedure was proposed to reject fluxes with the wrong sign, and three different equations were used successfully to detect the occurrence of condensation inside the type of measurement system used in the study. Guidelines to assure adequate fetch are provided. Fetch did not affect the measured fluxes in this study, which may have been due to the similarity in surface properties between the crops under study and those in the surrounding fields.
Keyword Alfalfa
Bowen ratio
Energy balance
Et
Evapotranspiration
Grass
Latent heat flux
Lysimeter
Soil heat flux
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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