Abstract
For many decades, attempts have been made to find the universal value of the critical bulk Richardson number (Ri Bc ; defined over the entire stable boundary layer). By analyzing an extensive large-eddy simulation database and various published wind-tunnel data, we show that Ri Bc is not a constant, rather it strongly depends on bulk atmospheric stability. A (qualitatively) similar dependency, based on the well-known resistance laws, was reported by Melgarejo and Deardorff (J Atmos Sci 31:1324–1333, 1974) about forty years ago. To the best of our knowledge, this result has largely been ignored. Based on data analysis, we find that the stability-dependent Ri Bc estimates boundary-layer height more accurately than the conventional constant Ri Bc approach. Furthermore, our results indicate that the common practice of setting Ri Bc as a constant in numerical modelling studies implicitly constrains the bulk stability of the simulated boundary layer. The proposed stability-dependent Ri Bc does not suffer from such an inappropriate constraint.
Original language | English |
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Pages (from-to) | 93-109 |
Journal | Boundary-Layer Meteorology |
Volume | 148 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2013 |
Keywords
- large-eddy simulation
- turbulence structure
- resistance laws
- climate model
- surface
- depth
- formulations
- evolution
- profile
- range