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| Titel |
The role of subsidence in a weakly unstable marine boundary layer: a case study |
| VerfasserIn |
I. M. Mazzitelli, M. Cassol, M. M. Miglietta, U. Rizza, A. M. Sempreviva, A. S. Lanotte |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 21, no. 2 ; Nr. 21, no. 2 (2014-04-11), S.489-501 |
| Datensatznummer |
250120908
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| Publikation (Nr.) |
 copernicus.org/npg-21-489-2014.pdf |
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| Zusammenfassung |
| The diurnal evolution of a cloud free, marine boundary layer is studied by
means of experimental measurements and numerical simulations. Experimental
data belong to an investigation of the mixing height over inner Danish
waters. The mixed-layer height measured over the sea is generally nearly
constant, and does not exhibit the diurnal cycle characteristic of boundary
layers over land. A case study, during summer, showing an anomalous
development of the mixed layer under unstable and nearly neutral atmospheric
conditions, is selected in the campaign. Subsidence is identified as the main
physical mechanism causing the sudden decrease in the mixing layer height.
This is quantified by comparing radiosounding profiles with data from
numerical simulations of a mesoscale model, and a large-eddy simulation
model. Subsidence not only affects the mixing layer height, but also the
turbulent fluctuations within it. By analyzing wind and scalar spectra, the
role of subsidence is further investigated and a more complete interpretation
of the experimental results emerges. |
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