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.
|Number of pages||2|
|Publication status||Published - 2015|
|Event||15th European Turbulence Conference, ETC 2015 - Delft, Netherlands|
Duration: 25 Aug 2015 → 28 Aug 2015
Conference number: 15
|Conference||15th European Turbulence Conference, ETC 2015|
|Period||25/08/15 → 28/08/15|