SMuK 2023 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 6: Poster

UP 6.2: Poster

Mittwoch, 22. März 2023, 17:30–19:00, HSZ OG1

Calibration of an Air Data Probe to complement airborne in-situ Flux Measurements — •Josua Schindewolf — Institut für Umweltphysik, Universität Bremen, Deutschland

Airborne in-situ measurements of greenhouse gases (GHG) contribute to the increasingly important task of monitoring the changing greenhouse gas emissions and attribution of the sources. For the quantification of GHG sources, not only observations of precise atmospheric concertation gradients are needed, but also accurate measurements of the corresponding wind fields. This is because, the computation of the emissions and their uncertainties have linear dependencies on wind speed and direction. In 2022 we installed and calibrated a new turbulence probe to the underwing pod of the research aircraft of the Jade University Wilhelmshaven to complement future airborne flux measurements with high accuracy wind data. A series of flights were conducted to carry out the in-flight calibration procedure recommended by the manufacturer. Additionally, a meteorological observation tower was used for a series of fly-by manoeuvres, providing ground-based reference wind data. The calibration exhibits a mean difference in wind speed of 0.3 m/s and in wind direction of 4° over ten such calibration flights. The tower comparison showed a mean difference in wind speed of 0.5 m/s and in wind direction of 20°. In summary, the results indicate that more calibration flights are required for a further evaluation, which will focus on the comparison with the ground based met tower observations. This is challenging, because of the high variability of the wind fields at low flight altitudes.