Comparison of Boundary-Layer Profiles and Layer Detection by AMDAR and WTR/RASS at Frankfurt Airport |
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| Authors: | Clemens Drüe Thomas Hauf Axel Hoff |
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| Institution: | (1) Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research – Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany |
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| Abstract: | At Frankfurt airport (EDDF) vertical soundings of the lower atmosphere from two independent sources are available. One of
them is a wind and temperature profiler (wind temperature radar and radio acoustic sounding system, WTR/RASS) located at the
western end of the main pair of runways. The second source is aircraft meteorological data relay (AMDAR), i.e. measurements
operationally collected by approaching and departing aircraft. Together, both offer a rare opportunity to compare the performance
of these widely used systems. We use 1 year of continuous data to calculate systematic temperature and wind vector differences
between both measurement systems. The differences show a clear season-dependent structure in conjunction with typical inversion
heights. Possible causes for this behaviour are discussed. Second, we compare the ability of both systems to identify inversion
and wind-shear layers above the airport. AMDAR-detected layers are typically higher than wind profiler detections. The layer
base is usually detected with more agreement than the top. The mutual probability of detection of inversions is found to be
mostly between 40 and 60%. |
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