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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 2
Nonlin. Processes Geophys., 23, 75-82, 2016
https://doi.org/10.5194/npg-23-75-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Complex environmental and geophysical turbulence

Nonlin. Processes Geophys., 23, 75-82, 2016
https://doi.org/10.5194/npg-23-75-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 21 Mar 2016

Research article | 21 Mar 2016

Study of the overturning length scales at the Spanish planetary boundary layer

Pilar López1 and José L. Cano2 Pilar López and José L. Cano
  • 1Applied Mathematics Dpt. (Biomathematics), Complutense University of Madrid, Madrid, Spain
  • 2Astronomy, Astrophysical and Atmospheric Science Dpt., Complutense University of Madrid, Madrid, Spain

Abstract. The focus of this paper is to analyse the behaviour of the maximum Thorpe displacement (dT)max and the Thorpe scale LT at the atmospheric boundary layer (ABL), extending previous research with new data and improving our studies related to the novel use of the Thorpe method applied to ABL. The maximum Thorpe displacements vary between −900 and 950m for the different field campaigns. The Thorpe scale LT ranges between 0.2 and 680m for the different data sets which cover different stratified mixing conditions (turbulence shear-driven and convective regions). We analyse the relationship between (dT)max and the Thorpe scale LT and we deduce that they verify a power law. We also deduce that there is a difference in exponents of the power laws for convective conditions and shear-driven conditions. These different power laws could identify overturns created under different mechanisms.

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The focus of this paper is to improve our studies related to the novel use of the Thorpe method applied to atmospheric boundary layer (ABL) using new data from Spanish field experiments. We analyse the time behaviour of the maximum Thorpe displacement (dT)max and the Thorpe-scale LT during a day cycle. We also analyse the relation between (dT)max and LT. We deduce that they confirm a power law statistically significant, with differences between convective conditions and shear-driven conditions.
The focus of this paper is to improve our studies related to the novel use of the Thorpe method...
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