caa a22 4500 475777352 CHVBK 20180406123634.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1023/A:1002402515319 doi (NATIONALLICENCE)springer-10.1023/A:1002402515319 Heat and Water Vapour Diffusivities Near the Base of a Disturbed Stable Internal Boundary Layer [Elektronische Daten] [Johannes Laubach, Keith McNaughton, John Wilson] We present results from an experiment that wasdesigned to investigate turbulent transportrelationships in a nearly homogeneous boundary layerdisturbed by unsteady wind swings, as found at thebase of an advective inversion with a convectiveboundary layer overhead. In such a situation wemeasured vertical gradients and eddy fluxes of temperature andhumidity at two heights. From these, the turbulentdiffusivities of heat and water vapour are obtained,and compared to the predictions of Monin-Obukhovsimilarity theory and those of a numericalsecond-order closure model. It is found that themeasured diffusivities exceed both predictions. Thisis interpreted as a consequence of the unsteadyconditions. It is also found that the diffusivity forheat is roughly 10% larger than that for watervapour. This is in agreement with a theoreticaltreatment of the unsteadiness effects that wedeveloped in an earlier publication. This result isnot reproduced by the numerical model because themodel has no provision for unsteady conditions. Ourresult disagrees with that from an earlier, verysimilar, field experiment, which may be due to asystematic underestimation of sensible heat flux inthe older experiment. Kluwer Academic Publishers, 2000 Advection nationallicence Disturbed boundary layer nationallicence Eddy correlation nationallicence Monin-Obukhov similarity theory nationallicence Scalar transport nationallicence Turbulent diffusion nationallicence Laubach Johannes Max-Planck-Institut für Biogeochemie, Postfach 10 01 64, D-07701, Jena, Germany aut McNaughton Keith INRA-Bioclimatologie, B. P. 81, F-33883, Villenave d'sOrnon Cedex, France aut Wilson John University of Alberta, T6G 2E3, Edmonton, Alberta, Canada aut Boundary-Layer Meteorology Kluwer Academic Publishers 94/1(2000-01-01), 23-63 0006-8314 94:1<23 2000 94 10546 https://doi.org/10.1023/A:1002402515319 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002402515319 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Laubach Johannes Max-Planck-Institut für Biogeochemie, Postfach 10 01 64, D-07701, Jena, Germany aut NATIONALLICENCE 700 1- McNaughton Keith INRA-Bioclimatologie, B. P. 81, F-33883, Villenave d'sOrnon Cedex, France aut NATIONALLICENCE 700 1- Wilson John University of Alberta, T6G 2E3, Edmonton, Alberta, Canada aut NATIONALLICENCE 773 0- Boundary-Layer Meteorology Kluwer Academic Publishers 94/1(2000-01-01), 23-63 0006-8314 94:1<23 2000 94 10546 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer