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On Reynolds Averaging of Turbulence Time Series
Springer Science and Business Media LLC - Tập 128 - Trang 303-311 - 2008
George Treviño, Edgar L. Andreas
We show that validity of Reynolds averaging for estimating the (ensemble) mean of a turbulence time series requires that the series values be both stationary and uncorrelated. In strict statistical terminology, these two conditions are jointly designated as independent identically distributed (i.i.d.). Moreover, we show that when the series values are correlated, knowledge of the correlation betwe...... hiện toàn bộ
Runway Wake Vortex, Crosswind, and Visibility Detection with a Scintillometer at Schiphol Airport
Springer Science and Business Media LLC - Tập 157 - Trang 481-499 - 2015
D. van Dinther, O. K. Hartogensis, A. A. M. Holtslag
We evaluate the performance and investigate the capability of a scintillometer to detect wake vortices, crosswind and visibility near an airport runway. An experiment is carried out at Schiphol airport (Amsterdam, The Netherlands), where an optical scintillometer is positioned alongside a runway. An algorithm is developed to detect wake vortices, and also the strength of the wake vortex, from the ...... hiện toàn bộ
Turbulence-Kinetic-Energy Budget in the Urban-Like Boundary Layer Using Large-Eddy Simulation
Springer Science and Business Media LLC - Tập 178 - Trang 201-223 - 2020
Geng Tian, Boris Conan, Isabelle Calmet
We describe and explain the turbulent processes at play in the lower part of the urban boundary layer through performing a large-eddy simulation of the flow over an urban-like canopy composed of a staggered array of cubes with a packing density of 25%. The simulation models neutral thermal conditions at a Reynolds number (based on both velocity at the top of the domain and the domain height) of ...... hiện toàn bộ
Announcement
Springer Science and Business Media LLC - Tập 60 - Trang 205-205 - 1992
The dependence of the measured cool skin of the ocean on wind stress and total heat flux
Springer Science and Business Media LLC - Tập 10 - Trang 465-474 - 1976
Hartmut Grassl
The temperature drop δT between the ocean surface and the 5-cm depth was recorded during GATE, Phase III. With measured values of the total heat flux Q and an assumption about the thickness of the viscous boundary layer of the ocean, the wind-speed dependence of the factor of proportionality between δT and Q is determined. This factor depends on the deviations of the thickness of the conductive la...... hiện toàn bộ
Microphysics and Optical Attenuation in Fog: Observations from Two Coastal Sites
Springer Science and Business Media LLC - Tập 181 - Trang 267-292 - 2021
Qing Wang, Ryan T. Yamaguchi, John A. Kalogiros, Zachary Daniels, Denny P. Alappattu, Haflidi Jonsson, Oswaldo Alvarenga, Alex Olson, Benjamin J. Wauer, David G. Ortiz-Suslow, Harindra Joseph Fernando
A total of 15 fog events from two field campaigns are investigated: the High Energy Laser in Fog (HELFOG) project (central California) and the Toward Improving Coastal Fog Prediction (C-FOG) project (Ferryland Newfoundland). Nearly identical sensors were used in both projects to sample fog droplet-size spectra, wind, turbulence, and thermodynamic properties near the surface. Concurrent measurement...... hiện toàn bộ
Observations of leaf stomatal conductance at the canopy scale: An atmospheric modeling perspective
Springer Science and Business Media LLC - Tập 64 - Trang 127-148 - 1993
Roni Avissar
Plant stomata play a key role in the redistribution of energy received on vegetated land into sensible and latent heat. As a result, they have a considerable impact on the atmospheric planetary boundary layer, the hydrologic cycle, the climate, and the weather. Current parameterizations of the stomatal mechanism in state-of-the-art atmospheric models are based on empirical relations that are estab...... hiện toàn bộ
The Validity of Similarity Theory in the Roughness Sublayer Above Forests
Springer Science and Business Media LLC - Tập 87 - Trang 69-99 - 1998
I. J. Simpson, G. W. Thurtell, H. H. Neumann, G. Den Hartog, G. C. Edwards
Flux-gradient relationships based upon similarity theory have been reported to severely underestimate scalar fluxes in the roughness sublayer above forests, as compared to independent flux estimates (for example, eddy covariance or energy balance measurements). This paper presents the results of a unique three-month investigation into the validity of similarity theory in the roughness sublayer abo...... hiện toàn bộ
Comparison of turbulence statistics within three boreal forest canopies
Springer Science and Business Media LLC - Tập 51 - Trang 99-121 - 1990
B. D. Amiro
Three-dimensional sonic anemometers were used to measure velocities and temperatures within three natural boreal forest canopies. Vertical profiles of atmospheric turbulence statistics for a black spruce forest, a jack pine forest, and a trembling aspen forest, all located in southeastern Manitoba, were plotted and compared. The canopy structures were quite different, with total leaf-area indices ...... hiện toàn bộ
Momentum- and Heat-Flux Parametrization at Dome C, Antarctica: A Sensitivity Study
Springer Science and Business Media LLC - Tập 162 - Trang 341-367 - 2016
Etienne Vignon, Christophe Genthon, Hélène Barral, Charles Amory, Ghislain Picard, Hubert Gallée, Giampietro Casasanta, Stefania Argentini
An extensive meteorological observational dataset at Dome C, East Antarctic Plateau, enabled estimation of the sensitivity of surface momentum and sensible heat fluxes to aerodynamic roughness length and atmospheric stability in this region. Our study reveals that (1) because of the preferential orientation of snow micro-reliefs (sastrugi), the aerodynamic roughness length ...... hiện toàn bộ
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