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| Author(s): | Savage, M. J.;
McInnes, K. J.;
Heilman, J. L. |
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| Author Affiliation: | Department of Agronomy, University of Natal, Pietermaritzburg, Republic of South Africa 3201; Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843 |
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| Title: | Placement height of eddy correlation sensors above a short turfgrass surface |
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| Source: | Agricultural and Forest Meteorology. Vol. 74, No. 3/4, May 1995, p. 195-204. |
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| Publishing Information: | Amsterdam: Elsevier Science Publications |
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| # of Pages: | 10 |
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| Keywords: | TIC Keywords: Correlation; Wind; Sensors
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| Abstract/Contents: | "Variations in measured sensible heat flux density F^D[h with sensor height above shortest turfgrass during mainly unstable conditions was investigated using the eddy correlation(EC) technique. Our data showed the EC-measured F^D[h values at 0.25 and .38 m above the turfgrass were 15% and 10% lower, respectively, than that at the 1.00 m height. There was no statistical difference in the EC-measured F^D[h at 0.50, 1.0 and 1.25 m. An analysis of 'footprints' shows that at least 90% of the measured F^D[h at a height of 0.5 m was from our experimental site, decreasing to less than 70% at the 1.5 m height. Sensor placement at the 0.5 m height would result in little reduction, as did occur at heights less than 0.50 m, in the covariance between vertical wind speed fluctuation and air temperature fluctuation, owing to small-sized eddies being contained between the separation distance of the sonic anemometer transducers. We speculate that measurements closer than 0.5 m to the surface differed form those at 1.00 m as a result of small-sized eddies near the surface being contained between the sonic separation distance and therefore not completely detected by the sonic anemometer." |
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| Language: | English |
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| References: | 10 |
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| Note: | Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Savage, M. J., K. J. McInnes, and J. L. Heilman. 1995. Placement height of eddy correlation sensors above a short turfgrass surface. Agric. Meteorol. 74(3/4):p. 195-204. |
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