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| Titel |
Turbulence-wave interactions associated to drainage flows observed during
the BLLAST field campaign |
| VerfasserIn |
Carlos Yagüe, Jielun Sun, Carlos Román-Cascón, Mariano Sastre, Jon A. Arrillaga |
| 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 |
250137205
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| Publikation (Nr.) |
 EGU/EGU2016-18411.pdf |
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| Zusammenfassung |
| Gravity waves are often observed in the Nocturnal Stable Atmospheric Boundary Layer
(SBL). One of the main topics in SBL studies, which is still far from being well
understood, is the interaction between these waves and the turbulence present at the lower
troposphere [1]. However it is not easy to establish the origin of these waves and
how they interact with turbulence. Following the case study occurred along the
evening transition of 2nd July 2011 over the area of Lannemezan (France) during the
Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST) field campaign [2],
in the present work we have extended the study to all the cases found along the
campaign, where the evening transition of the Atmospheric Boundary Layer was
followed by the formation of drainage flows. Different multiscale techniques (Wavelet
Transform -WT- and MultiResolution Flux Decomposition -MRFD-) have been
applied to the extensive records of instrumentation deployed at BLLAST. In this way,
we can underline the different features related to surface turbulent parameters in
the SBL, where several of the studied processes showed an interaction, producing
important variations in turbulence with height and between sites along the steep
terrain.
[1] Sun, J., C. J. Nappo, L. Mahrt, D. Belusic, B. Grisogono, D. R. Stauffer, M. Pulido, C.
Staquet, Q. Jiang, A. Pouquet, C. Yagüe, B. Galperin, R. B. Smith, J. J. Finnigan, S.D.
Mayor, G. Svensson, A. A. Grachev, and W.D.Neff. (2015): Review of wave-turbulence
interactions in the stable atmospheric boundary layer, Rev. Geophys., 53, 956–993,
doi:10.1002/2015RG000487.
[2] Román-Cascón, C., Yagüe, C., Mahrt, L., Sastre, M., Steeneveld, G.-J., Pardyjak, E.,
van de Boer, A., and Hartogensis, O (2015).: Interactions among drainage flows, gravity
waves and turbulence: a BLLAST case study, Atmos. Chem. Phys., 15, 9031-9047,
doi:10.5194/acp-15-9031-2015. |
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