Large Aperture Scintillometer Intercomparison Study |
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| Authors: | J Kleissl J Gomez S-H Hong J M H Hendrickx T Rahn W L Defoor |
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| Institution: | (1) Department of Earth and Environmental Sciences, New Mexico Tech, Socorro, NM, USA;(2) Present address: Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA 92093-0411, USA;(3) Los Alamos National Lab, Los Alamos, NM, USA |
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| Abstract: | Two field studies with six large aperture scintillometers (LASs) were performed using horizontal and slant paths. The accuracy
of this novel and increasingly popular technique for measuring sensible heat fluxes was quantified by comparing measurements
from different instruments over nearly identical transects. Random errors in LAS measurements were small, since correlation
coefficients between adjacent measurements were greater than 0.995. However, for an ideal set-up differences in linear regression
slopes of up to 21% were observed with typical inter-instrument differences of 6%. Differences of 10% are typical in more
realistic measurement scenarios over homogeneous natural vegetation and different transect heights and locations. Inaccuracies
in the optics, which affect the effective aperture diameter, are the most likely explanation for the observed differences. |
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| Keywords: | Instrument intercomparison Large aperture scintillometer Sensible heat flux |
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