Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3515814w&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 15, CiteID L15814
Physics
3
Atmospheric Processes: Turbulence (4490), Atmospheric Processes: Clouds And Cloud Feedbacks, Atmospheric Processes: Boundary Layer Processes
Scientific paper
A large-eddy simulation model is used to examine the impact of the intense cross-inversion wind shear on the stratocumulus cloud structure. The wind shear enhanced entrainment mixing effectively reduces the cloud water and thickens the inversion layer. It leads to a reduction of the turbulence kinetic energy (TKE) production in the cloud layer due to the weakened cloud-top radiative cooling and the formation of a turbulent and cloud free sublayer within the inversion. The thickness of the sublayer increases with the enhanced wind shear intensity. Under the condition of a weaker inversion, the enhanced shear mixing within the inversion layer even lowers the cloud-top height and reduces the entrainment velocity. Finally, increasing wind shear or reducing inversion strength tends to create an inversion layer with a constant bulk Richardson number (~0.3), suggesting that an equilibrium value of the Richardson number is reached.
Golaz Jean-Christophe
Wang Qing
Wang Shouping
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