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Observed spatial variability of boundary-layer turbulence over flat, heterogeneous terrain

Maurer, V.; Kalthoff, N.; Wieser, A.; Kohler, M.; Mauder, M.


In spring 2013, extensive measurements with multiple Doppler lidar systems were performed. The instruments were arranged in a triangle with edge lengths of about 3 km in a moderately flat, agriculturally used terrain. For six mostly cloud-free convective days, vertical velocity variance profiles were compared for the three locations. On the average over all considered cases, differences between variances at different sites were about three times higher than between those derived from measurements by different lidars at the same site. For all investigated averaging periods between 10 min and 4 h, the differences were not significant on the average when considering the statistical error. However, statistically significant spatial differences were found in several individual cases. These could not be explained by the existing surface heterogeneity.

In some cases, nearby energy balance stations provided surface fluxes that were not suitable for scaling the variance profiles. Weighted-averaged values proved to be more applicable, but even then, the scaled profiles showed a large scatter for each location. Therefore, it must be assumed that the intensity of turbulence is not always well-determined by the local heat supply at the Earth's surface. ... mehr

Volltext §
DOI: 10.5445/IR/1000048299
DOI: 10.5194/acpd-15-18011-2015
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Institut für Meteorologie und Klimaforschung Troposphärenforschung (IMKTRO)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7367
KITopen-ID: 1000048299
HGF-Programm 12.02.05 (POF III, LK 01) Atmospheric Exchange Processes
Erschienen in Atmospheric Chemistry and Physics Discussions
Verlag European Geosciences Union (EGU)
Band 15
Heft 13
Seiten 18011-18064
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