TY - JOUR
T1 - Subgrid-Scale dynamics of water vapour, heat, and momentum over a lake
AU - Vercauteren, Nikki
AU - Bou-Zeid, Elie R.
AU - Parlange, Marc B.
AU - Lemmin, Ulrich
AU - Huwald, Hendrik
AU - Selker, John
AU - Meneveau, Charles
N1 - Funding Information:
Acknowledgements The authors would like the thank the Swiss National Science Foundation for its support for this work through grant number 200021–107910 and through the National Competence Center in Research on Mobile Information and Communication Systems (NCCR-MICS) under grant number 5005-67322. C. Meneveau is supported by the US National Science Foundation under grant EAR-0609690.
PY - 2008/8
Y1 - 2008/8
N2 - We examine the dynamics of turbulence subgrid (or sub-filter) scales over a lake surface and the implications for large-eddy simulations (LES) of the atmospheric boundary layer. The analysis is based on measurements obtained during the Lake-Atmosphere Turbulent EXchange (LATEX) field campaign (August-October, 2006) over Lake Geneva, Switzerland. Wind velocity, temperature and humidity profiles were measured at 20 Hz using a vertical array of four sonic anemometers and open-path gas analyzers. The results indicate that the observed subgrid-scale statistics are very similar to those observed over land surfaces, suggesting that the effect of the lake waves on surface-layer turbulence during LATEX is small. The measurements allowed, for the first time, the study of subgrid-scale turbulent transport of water vapour, which is found to be well correlated with the transport of heat, suggesting that the subgrid-scale modelling of the two scalars may be coupled to save computational resources during LES.
AB - We examine the dynamics of turbulence subgrid (or sub-filter) scales over a lake surface and the implications for large-eddy simulations (LES) of the atmospheric boundary layer. The analysis is based on measurements obtained during the Lake-Atmosphere Turbulent EXchange (LATEX) field campaign (August-October, 2006) over Lake Geneva, Switzerland. Wind velocity, temperature and humidity profiles were measured at 20 Hz using a vertical array of four sonic anemometers and open-path gas analyzers. The results indicate that the observed subgrid-scale statistics are very similar to those observed over land surfaces, suggesting that the effect of the lake waves on surface-layer turbulence during LATEX is small. The measurements allowed, for the first time, the study of subgrid-scale turbulent transport of water vapour, which is found to be well correlated with the transport of heat, suggesting that the subgrid-scale modelling of the two scalars may be coupled to save computational resources during LES.
KW - Large-eddy simulation
KW - Non-linear model
KW - Smagorinsky model
KW - Turbulent Prandtl number
KW - Turbulent Schmidt number
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U2 - 10.1007/s10546-008-9287-9
DO - 10.1007/s10546-008-9287-9
M3 - Article
AN - SCOPUS:47649096417
SN - 0006-8314
VL - 128
SP - 205
EP - 228
JO - Boundary-Layer Meteorology
JF - Boundary-Layer Meteorology
IS - 2
ER -