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Titel |
Boundary layer dynamics in a small shallow valley near the Alps (ScaleX campaign) |
VerfasserIn |
Matthias Zeeman, Bianca Adler, Tirtha Banerjee, Peter Brugger, Frederik De Roo, Stefan Emeis, Matthias Mauder, Klaus Schäfer, Benjamin Wolf, Hans Peter Schmid |
Konferenz |
EGU General Assembly 2016
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Medientyp |
Artikel
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Sprache |
en
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 18 (2016) |
Datensatznummer |
250132935
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Publikation (Nr.) |
EGU/EGU2016-13490.pdf |
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Zusammenfassung |
Mountainous terrain presents a challenge for the experimental determination of exchange
processes. The Alps modulate synoptic flow and introduce circulation systems that reach into
the forelands. In addition, the Prealpine landscape is heterogeneous itself, dominated by
patches of forestry on the slopes and agriculture on flat areas. That combined complexity is
manifest in atmospheric circulations at multiple scales. We investigated the diurnal evolution
of the atmospheric boundary layer with focus on the connection between surface
exchange processes and atmospheric circulations at the regional to local scale. The
experiment is part of an ongoing, multi-disciplinary study on scale dependencies in the
distribution of energy and matter (ScaleX) at the TERENO Prealpine observatory in
Germany.
We observed vertical profiles of wind speed and air temperature up to 1000 m above
ground during June and July 2015 in a small shallow Prealpine valley in Bavaria, Germany.
Wind vectors and temperature were observed using ground-based optical, acoustic and
radiometric remote sensing techniques. Spatial patterns in wind speed and direction were
determined using eddy covariance systems, 3D Doppler LIDAR and acoustic sounding
(RASS). Three Doppler LIDAR units were configured to form a virtual tower at the
beam intersect. Temperature profiles were observed using radio-acoustic sounding
(RASS) and a microwave radiometer (HATPRO). The temporal and spatial resolutions
of the resulting vertical profiles were between 1–15 min and between 3–100 m,
respectively.
The observed variability in wind vectors and stability shows evidence of the link between
flow phenomena at micro- to mesoscale and local biosphere-atmosphere exchange processes.
We present first results and discuss the predictability of the impact of local and regional
(alpine) landscape features on flow and structures in the atmospheric boundary layer. |
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