caa a22 4500 475777816 CHVBK 20180406123636.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1023/A:1002641728075 doi (NATIONALLICENCE)springer-10.1023/A:1002641728075 Numerical Study Of The Impact Of Coherent Structures On Vertical Transfers In The Atmospheric Boundary Layer [Elektronische Daten] [F. Lohou, A. Druilhet, B. Campistron, J.-L. Redelspergers, F. Saïd] In two preceding papers, coherent structures of theatmospheric boundary layer (ABL), such as rollvortices or cells, were investigated through radar andaircraft observations collected during the TRAC-93(Turbulence Radar Aircraft Cells) experiment held inFrance in June 1993. The analysis of this experimentaldata set provided information on the spatialcharacteristics of these organisations (length scale,orientation, type ... ), their temporal and verticalevolution, and their relation with the dynamic andthermodynamic conditions of the ABL. For the thirdpaper in this series, a large eddy simulation model is used to examine the impact of thecoherent structures on the ABL vertical fluxes. Theanalysis of the simulated horizontal fields is madewith two-dimensional auto and cross-correlationsapplied on different pertinent ABL variables. Theresults emphasise a directional anisotropy of theseorganised fields throughout the ABL, much morepronounced in the heat flux fields, not only at thelength scale of organisations but also at theturbulence scales. This finding has an importantconsequence for traditional ABL flux measurementsbased on the hypothesis of isotropic and homogeneousturbulence. It can explain part of the underestimationof the surface fluxes often mentioned in theliterature. This approach makes it possible tomodify the concept of diffusion time (in chemicalmodelling) and could also lead to revised ABLparameterisations in Range Scale models. Kluwer Academic Publishers, 2000 Coherent structures nationallicence Numerical modelling nationallicence Turbulence nationallicence Lohou F. Observatoire Midi-Pyrénées, Laboratoire d'Aérologie (UMR CNRS/UPS 5560), 14 Avenue E. Belin, 31400, Toulouse, France aut Druilhet A. Observatoire Midi-Pyrénées, Laboratoire d'Aérologie (UMR CNRS/UPS 5560), 14 Avenue E. Belin, 31400, Toulouse, France aut Campistron B. Observatoire Midi-Pyrénées, Laboratoire d'Aérologie (UMR CNRS/UPS 5560), 14 Avenue E. Belin, 31400, Toulouse, France aut Redelspergers J.-L Centre National de Recherches Météorologiques/CNRS, Mété-France, 42 Avenue G. Coriolis, 31057, Toulouse, France aut Saïd F. Observatoire Midi-Pyrénées, Laboratoire d'Aérologie (UMR CNRS/UPS 5560), 14 Avenue E. Belin, 31400, Toulouse, France aut Boundary-Layer Meteorology Kluwer Academic Publishers 97/3(2000-12-01), 361-383 0006-8314 97:3<361 2000 97 10546 https://doi.org/10.1023/A:1002641728075 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002641728075 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lohou F. Observatoire Midi-Pyrénées, Laboratoire d'Aérologie (UMR CNRS/UPS 5560), 14 Avenue E. Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Druilhet A. Observatoire Midi-Pyrénées, Laboratoire d'Aérologie (UMR CNRS/UPS 5560), 14 Avenue E. Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Campistron B. Observatoire Midi-Pyrénées, Laboratoire d'Aérologie (UMR CNRS/UPS 5560), 14 Avenue E. Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Redelspergers J.-L Centre National de Recherches Météorologiques/CNRS, Mété-France, 42 Avenue G. Coriolis, 31057, Toulouse, France aut NATIONALLICENCE 700 1- Saïd F. Observatoire Midi-Pyrénées, Laboratoire d'Aérologie (UMR CNRS/UPS 5560), 14 Avenue E. Belin, 31400, Toulouse, France aut NATIONALLICENCE 773 0- Boundary-Layer Meteorology Kluwer Academic Publishers 97/3(2000-12-01), 361-383 0006-8314 97:3<361 2000 97 10546 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer