Shear capacity as prognostic of nocturnal boundary layer regimes

Ivo van Hooijdonk, Judith Donda, Fred Bosveld, Arnold Moene, Herman Clercx, Bas van de Wiel

Research output: Contribution to conferenceConference paper

Abstract

In some nights, the near-surface temperature can drop dramatically and turbulence in the stably stratified boundary layer becomes very weak, such that the lfow reaches a (quasi-) laminar state. In other cases, however, the atmosphere remains in a turbulent state and temperatures stay relatively high. Recently, the appearance of two distinct boundary layer regimes was explained by a new theoretical framework. This theory builds on the fact that the turbulent heat flux in stably stratified flow is limited to a maximum for given wind shear. This introduces a characteristic flux-based velocity scale, which can be used to predict the regimes. This hypothesis is consistent with field observations and numerical results. Also, the hypothesis is generalised to a dimensionless framework.

Original languageEnglish
Publication statusPublished - Aug 2015
Event15th European Turbulence Conference, ETC 2015 - Delf, Netherlands
Duration: 25 Aug 201528 Aug 2015

Conference

Conference15th European Turbulence Conference, ETC 2015
CountryNetherlands
CityDelf
Period25/08/1528/08/15

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    van Hooijdonk, I., Donda, J., Bosveld, F., Moene, A., Clercx, H., & van de Wiel, B. (2015). Shear capacity as prognostic of nocturnal boundary layer regimes. Paper presented at 15th European Turbulence Conference, ETC 2015, Delf, Netherlands.