Research Note

Boundary-Layer Meteorology

, Volume 150, Issue 3, pp 515-523

First online:

Observational Support for the Stability Dependence of the Bulk Richardson Number Across the Stable Boundary Layer

  • S. BasuAffiliated withDepartment of Marine, Earth, and Atmospheric Sciences, North Carolina State University Email author 
  • , A. A. M. HoltslagAffiliated withMeteorology and Air Quality Section, Wageningen University
  • , L. CaporasoAffiliated withICTP
  • , A. RiccioAffiliated withDepartment of Applied Science, University of Naples ‘Parthenope’
  • , G.-J. SteeneveldAffiliated withMeteorology and Air Quality Section, Wageningen University

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The bulk Richardson number (\(Ri_{Bh}\); defined over the entire stable boundary layer) is commonly utilized in observational and modelling studies for the estimation of the boundary-layer height. Traditionally, \(Ri_{Bh}\) is assumed to be a quasi-universal constant. Recently, based on large-eddy simulation and wind-tunnel data, a stability-dependent relationship has been proposed for \(Ri_{Bh}\). In this study, we analyze extensive observational data from several field campaigns and provide further support for this newly proposed relationship.


Boundary-layer height Stable boundary layer Turbulence