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Corrigendum to "Measuring the 3-D wind vector with a weight-shift microlight aircraft" published in Atmos. Meas. Tech., 4, 1421–1444, 2011

Title data

Metzger, Stefan ; Junkermann, Wolfgang ; Butterbach-Bahl, Klaus ; Schmid, Hans-Peter ; Foken, Thomas:
Corrigendum to "Measuring the 3-D wind vector with a weight-shift microlight aircraft" published in Atmos. Meas. Tech., 4, 1421–1444, 2011.
In: Atmospheric Measurement Techniques. Vol. 4 (2011) Issue 7 . - pp. 1515-1539.
ISSN 1867-8548
DOI: https://doi.org/10.5194/amt-4-1515-2011

Abstract in another language

This study investigates whether the 3-D wind vector can be measured reliably from a highly transportable and low-cost weight-shift microlight aircraft. We draw up a transferable procedure to accommodate flow distortion originating from the aircraft body and -wing. This procedure consists of the analysis of aircraft dynamics and seven successive calibration steps. For our aircraft the horizontal wind components receive their greatest single amendment (14%, relative to the initial uncertainty) from the correction of flow distortion magnitude in the dynamic pressure computation. Conversely the vertical wind component is most of all improved (31%) by subsequent steps considering the 3-D flow distortion distribution in the flow angle computations. Therein the influences of the aircraft’s trim (53%), as well as changes in the aircraft lift (16%) are considered by using the measured lift coefficient as explanatory variable. Three independent lines of analysis are used to evaluate the quality of the wind measurement: (a) A wind tunnel study in combination with the propagation of sensor uncertainties defines the systems input uncertainty to ≈0.6m s⁻¹ at the extremes of a 95% confidence interval. (b) During severe vertical flight manoeuvres the deviation range of the vertical wind component does not exceed 0.3m s⁻¹. (c) The comparison with ground based wind measurements yields an overall operational uncertainty (root mean square error) of ≈0.4m s⁻¹ for the horizontal and ≈0.3m s⁻¹ for the vertical wind components. No conclusive dependence of the uncertainty on the wind magnitude (<8 m s⁻¹) or true airspeed (ranging from 23–30m s⁻¹) is found. Hence our analysis provides the necessary basis to study the wind measurement precision and spectral quality, which is prerequisite for reliable eddy-covariance flux measurements.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER98847
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professorship Micrometeorology - Univ.-Prof. Dr. Thomas Foken
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 13 Aug 2015 06:11
Last Modified: 13 Aug 2015 06:11
URI: https://eref.uni-bayreuth.de/id/eprint/17946