NDLI: The Effect of a New Calibration Procedure on the Measurement Accuracy of Scintec’s Displaced-Beam Laser Scintillometer

Content Provider	Springer Nature Link
Author	Van Kesteren, B. Beyrich, F. Hartogensis, O. K. Kroonenberg, A. C.
Copyright Year	2013
Abstract	We describe a new calibration procedure included in the production process of Scintec’s displaced-beam laser scintillometers (SLS-20/40) and its effect on their measurement accuracy. The calibration procedure determines the factual displacement distances of the laser beams at the receiver and transmitter units, instead of assuming a prescribed displacement distance of 2.70 mm. For this study, four scintillometers operated by Wageningen University and the German Meteorological Service were calibrated by Scintec and their data re-analyzed. The results show that significant discrepancies may exist between the factual and the prescribed displacement distances. Generally, the factual displacement is about 0.1 mm smaller than 2.70 mm, but extremes varied between 0.04 and 0.24 mm. Correspondingly, using non-calibrated scintillometers may result in biases as large as 20 % in the estimates of the inner-scale length, $$l_{0}$$ , the structure parameter of the refractive index, $$C_{n_{_2}}$$ , and the friction velocity, $$u_{}$$ . The bias in the sensible heat flux was negligible, because biases in $$C_{n_{_2}}$$ and $$u_{}$$ cancel. Hence, the discrepancies explain much of the long observed underestimations of $$u_{*}$$ determined by these scintillometers. Furthermore, the calibration improves the mutual agreement between the scintillometers for $$l_{0}$$ , but especially for $$C_{n_{_2}}$$ . Finally, it is noted that the measurement specifications of the scintillometer do not expire and hence the results of the calibration can be applied retroactively.
Starting Page	257
Ending Page	271
Page Count	15
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	151
Issue Number	2
e-ISSN	15731472
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-12-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Friction velocity Instrumentation/sensors Monin–Obukhov similarity theory Spectral bottleneck effect Surface fluxes Surface-layer scintillometer Atmospheric Sciences Meteorology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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