2015/05/03 by Jahrul Alam, Alam, Jahrul M., M. Alamgir Hossain +1
Earth and Planetary Sciences · Engineering · Environmental Science · #Atmospheric and Oceanic Physics (physics.ao-ph) #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Turbulent Flows #Meteorological Phenomena and Simulations #Wind and Air Flow Studies
paper · pdf · doi:10.48550/arxiv.1505.00448
openalex publication_date 2015/05/03 · openalex created_date 2022/09/04 · openalex updated_date 2026/07/28
This article investigates penetrative turbulence in the atmospheric boundary\nlayer. Using a large eddy simulation approach, we study characteristics of the\nmixed layer with respect to surface heat flux variations in the range from\n231.48 W/m2 to 925.92 W/m2, and observe that the surface heterogeneity on\na spatial scale of 20 km leads to downscale turbulent kinetic energy cascade.\nCoherent fluctuations of mesoscale horizontal wind is observed at 100m above\nthe ground. Such a surface induced temporal oscillations in the horizontal wind\nsuggest a rapid jump in mesocale wind forecasts, which is difficult to\nparameterize using traditional one-dimensional ensemble-mean models. Although\nthe present work is idealized at a typical scale (20km) of surface\nheterogeneity, the results help develop effective subgrid scale\nparameterization schemes for classical weather forecasting mesoscale models.\n