Determination of sensible heat flux over sparse canopy using thermal infrared data
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Abstract
Surface temperatures, Ts, were estimated for a natural vegetative surface in Owens Valley, California, with infrared thermometric observations collected from an aircraft. The region is quite arid and is composed primarily of bushes (∼30%) and bare soil (∼70%). Application of the bulk transfer equation for the estimation of sensible heat, H, gave unsatisfactory values when compared to Bowen ratio and eddy correlation methods over a particular site. This was attributed to the inability with existing data to properly evaluate the resistance to heat transfer, rah. To obtain appropriate rah-values the added resistance to heat transfer, kB−1, was allowed to vary although there is both theoretical and experimental evidence that kB−1 for vegetative surfaces can be treated as constant. The present data indicate that for partial canopy cover under arid conditions kB−1 may be a function of Ts measured radiometrically. The equation determining kB−1 was simplified and tested over another arid site with good results; however, this had a limited data set (i.e., 6 data points). The dimensionless kB−1 equation is simplified for use over full canopy cover and is shown to give satisfactory estimates of H over a fully-grown wheat crop.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Determination of sensible heat flux over sparse canopy using thermal infrared data |
| Series title | Agricultural and Forest Meteorology |
| DOI | 10.1016/0168-1923(89)90017-8 |
| Volume | 44 |
| Issue | 3-4 |
| Year Published | 1989 |
| Language | English |
| Publisher | Elsevier |
| Description | 20 p. |
| First page | 197 |
| Last page | 216 |
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