Turbulent Kinetic Energy Budgets over Gentle Topography Covered by Forests

Chen, Bicheng; Chamecki, Marcelo

doi:10.1175/JAS-D-22-0027.1

Turbulent Kinetic Energy Budgets over Gentle Topography Covered by Forests

Journal Article · Sun Jan 01 00:00:00 EST 2023 · Journal of the Atmospheric Sciences

DOI:https://doi.org/10.1175/JAS-D-22-0027.1· OSTI ID:2945255

Chen, Bicheng ^[1]; Chamecki, Marcelo ^[2]

Xiamen University (China)
University of California, Los Angeles, CA (United States)

Large-eddy simulations of flow over a “horizontally” uniform model forest are used to investigate the effects of gentle topography on the turbulent kinetic energy (TKE) budget within the canopy roughness sublayer. Despite significant differences between simulations using idealized sinusoidal topography and real topography of the Amazon forest, results indicate that the effects of topography are located predominantly in the upper canopy and above, and are mostly caused by mean advection of TKE. The “horizontally” averaged TKE budget from idealized and real gentle topographies are almost identical to that for flat terrain, including a clear inertial layer above the roughness sublayer in which shear production is balanced by local dissipation. At topography crests, where observational towers are usually located, mean vertical advection of TKE can be as important as horizontal advection. Here, we propose the use on an approximate TKE balance equation to estimate mean advection from single tower measurements, and introduce a new advection index that can be used as a proxy to quantify the importance of the topography on the TKE budget.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center; Univ. of California, Los Angeles, CA (United States); University of California, Los Angeles, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); U.S. National Science Foundation; USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division

Contributing Organization:: Argonne National Laboratory (ANL); Brookhaven National Laboratory (BNL); Oak Ridge National Laboratory (ORNL); Pacific Northwest National Laboratory (PNNL)

Grant/Contract Number:: SC0022072

OSTI ID:: 2945255

Alternate ID(s):: OSTI ID: 1905300
OSTI ID: 1994183

Journal Information:: Journal of the Atmospheric Sciences, Journal Name: Journal of the Atmospheric Sciences Journal Issue: 1 Vol. 80; ISSN 1520-0469; ISSN 0022-4928

Publisher:: American Meteorological SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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