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Turbulence vertical...
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Darbieu, C.Univ Toulouse, CNRS UMR 5560, Lab Aerol Toulouse, Toulouse, France.
(författare)
Turbulence vertical structure of the boundary layer during the afternoon transition
- Artikel/kapitelEngelska2015
Förlag, utgivningsår, omfång ...
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2015-09-09
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Copernicus GmbH,2015
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electronicrdacarrier
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LIBRIS-ID:oai:DiVA.org:uu-265638
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-265638URI
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https://doi.org/10.5194/acp-15-10071-2015DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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We investigate the decay of planetary boundary layer (PBL) turbulence in the afternoon, from the time the surface buoyancy flux starts to decrease until sunset. Dense observations of mean and turbulent parameters were acquired during the Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST) field experiment by several meteorological surface stations, sounding balloons, radars, lidars and two aircraft during the afternoon transition. We analysed a case study based on some of these observations and large-eddy simulation (LES) data focusing on the turbulent vertical structure throughout the afternoon transition. The decay of turbulence is quantified through the temporal and vertical evolution of (1) the turbulence kinetic energy (TKE), (2) the characteristic length scales of turbulence and (3) the shape of the turbulence spectra. A spectral analysis of LES data, airborne and surface measurements is performed in order to characterize the variation in the turbulent decay with height and study the distribution of turbulence over eddy size. This study highlights the LES ability to reproduce the turbulence evolution throughout the afternoon. LESs and observations agree that the afternoon transition can be divided in two phases: (1) a first phase during which the TKE decays at a low rate, with no significant change in turbulence characteristics, and (2) a second phase characterized by a larger TKE decay rate and a change in spectral shape, implying an evolution of eddy size distribution and energy cascade from low to high wave number. The changes observed either in TKE decay (during the first phase) or in the vertical wind spectra shape (during the second phase of the afternoon transition) occur first in the upper region of the PBL. The higher within the PBL, the stronger the spectra shape changes.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Lohou, F.Univ Toulouse, CNRS UMR 5560, Lab Aerol Toulouse, Toulouse, France.
(författare)
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Lothon, M.Univ Toulouse, CNRS UMR 5560, Lab Aerol Toulouse, Toulouse, France.
(författare)
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de Arellano, J. Vila-GuerauWageningen Univ, Meteorol & Air Qual Sect, NL-6700 AP Wageningen, Netherlands.
(författare)
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Couvreux, F.CNRM GAME Meteo France & CNRS, Toulouse, France.
(författare)
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Durand, P.Univ Toulouse, CNRS UMR 5560, Lab Aerol Toulouse, Toulouse, France.
(författare)
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Pino, D.Univ Politecn Cataluna, BarcelonaTech, Dept Appl Phys, Barcelona, Spain.;Inst Space Studies Catalonia IEEC UPC, Barcelona, Spain.
(författare)
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Patton, E. G.Natl Ctr Atmospher Res, Boulder, CO 80307 USA.
(författare)
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Nilsson, ErikUppsala universitet,Luft-, vatten- och landskapslära,Univ Toulouse, CNRS UMR 5560, Lab Aerol Toulouse, Toulouse, France.(Swepub:uu)erini203
(författare)
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Blay-Carreras, E.Univ Politecn Cataluna, BarcelonaTech, Dept Appl Phys, Barcelona, Spain.
(författare)
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Gioli, B.CNR, Inst Biometeorol IBIMET, Florence, Italy.
(författare)
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Univ Toulouse, CNRS UMR 5560, Lab Aerol Toulouse, Toulouse, France.Wageningen Univ, Meteorol & Air Qual Sect, NL-6700 AP Wageningen, Netherlands.
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Atmospheric Chemistry And Physics: Copernicus GmbH15:17, s. 10071-100861680-73161680-7324
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Darbieu, C.
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Lohou, F.
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Lothon, M.
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de Arellano, J. ...
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Couvreux, F.
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Durand, P.
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visa fler...
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Pino, D.
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Patton, E. G.
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Nilsson, Erik
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Blay-Carreras, E ...
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Gioli, B.
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