Search Results - "Leclerc, M. Y"

Spatial and temporal variability in forest-atmosphere CO₂ exchange. [Erratum: 2004 Nov., v. 10, no. 11, p. 1961.] by Hollinger, D.Y, Aber, J, Dail, B, Davidson, E.A, Goltz, S.M, Hughes, H, Leclerc, M.Y, Lee, J.T, Richardson, A.D, Rodrigues, C

“…Seven years of carbon dioxide flux measurements indicate that a approximaely 90-year-old spruce dominated forest in Maine, USA, has been sequestering 174±46 g…”
Get full text

Flux and concentration footprint modelling: State of the art by Vesala, T., Kljun, N., Rannik, Ü., Rinne, J., Sogachev, A., Markkanen, T., Sabelfeld, K., Foken, Th, Leclerc, M.Y.

“…Since early 1990s, the development of footprint models has been rapid with presently four different approaches being available: (i) analytical models, (ii)…”
Get full text

On the impact of wave-like disturbances on turbulent fluxes and turbulence statistics in nighttime conditions: a case study by Durden, D. J, Nappo, C. J, Leclerc, M. Y, Duarte, H. F, Zhang, G, Parker, M. J, Kurzeja, R. J

“…The interpretation of flux measurements in nocturnal conditions is typically fraught with challenges. This paper reports on how the presence of wave-like…”
Get full text

Low-level jets and above-canopy drainage as causes of turbulent exchange in the nocturnal boundary layer by El-Madany, T. S, Duarte, H. F, Durden, D. J, Paas, B, Deventer, M. J, Juang, J.-Y, Leclerc, M. Y, Klemm, O

“…Sodar (SOund Detection And Ranging), eddy-covariance, and tower profile measurements of wind speed and carbon dioxide were performed during 17 consecutive…”
Get full text

Local flux-profile relationships of wind speed and temperature in a canopy layer in atmospheric stable conditions by Zhang, G., Leclerc, M. Y., Karipot, A.

“…The particularities of the physics of the canopy layer pose challenges to the determination and use of traditional universal functions so helpful in the…”
Get full text

Carbon dioxide fluxes from Tifway bermudagrass: early results by Cotten, David L., Zhang, G., Leclerc, M. Y., Raymer, P., Steketee, C. J.

“…This paper reports for the first time preliminary data on carbon uptake of warm-season turfgrass at a well-managed sod farm in south central Georgia. It…”
Get full text

Evaluation of backward and forward Lagrangian footprint models in the surface layer by Cai, X., Peng, G., Guo, X., Leclerc, M. Y.

“…Summary We ran a Lagrangian stochastic (LS) dispersion model in both forward-in-time and backward-in-time ways to derive footprints. Three Eulerian analytical…”
Get full text

Effect of clearcuts on footprints and flux measurements above a forest canopy by Sogachev, A., Leclerc, M.Y., Karipot, A., Zhang, G., Vesala, T.

“…A two-equation model based on transport equations of turbulent kinetic energy ( E) and specific dissipation ( ω) ( E– ω model) is used to investigate both the…”
Get full text

Upscaling fluxes from tower to landscape: Overlaying flux footprints on high-resolution (IKONOS) images of vegetation cover by Kim, J., Guo, Q., Baldocchi, D.D., Leclerc, M.Y., Xu, L., Schmid, H.P.

“…In this paper, we describe the process of assessing tower footprint climatology, spatial variability of site vegetation density based on satellite image…”
Get full text

Comparison of In-Canopy Flux Footprints between Large-Eddy Simulation and the Lagrangian Simulation by Prabha, T. V., Leclerc, M. Y., Baldocchi, D.

“…Flux footprints for neutral shear-driven canopy flows are evaluated using large-eddy simulation (LES) and a Lagrangian stochastic (LS) model. The Lagrangian…”
Get full text

Hysteresis response of daytime net ecosystem exchange during drought by Pingintha, N., Leclerc, M. Y., Beasley, J. P., Durden, D., Zhang, G., Senthong, C., Rowland, D.

“…Continuous measurements of net ecosystem CO2 exchange (NEE) using the eddy-covariance method were made over an agricultural ecosystem in the southeastern US…”
Get full text

Comparison between measured tracer fluxes and footprint model predictions over a homogeneous canopy of intermediate roughness by Leclerc, M.Y, Meskhidze, N, Finn, D

“…Fast response tracer flux measurements are compared against flux footprint predictions from both a Lagrangian stochastic simulation and an analytical solution…”
Get full text

Role of low-level jets and boundary-layer properties on the NBL budget technique by Mathieu, N., Strachan, I.B., Leclerc, M.Y., Karipot, A., Pattey, E.

“…The atmospheric properties of nights suited to the use of the nocturnal boundary layer budget technique to assess nocturnal CO 2 fluxes are presented and…”
Get full text

Footprint prediction of scalar fluxes from analytical solutions of the diffusion equation by SCHUEPP, P. H, LECLERC, M. Y, MACPHERSON, J. I, DESJARDINS, R. L

“…The use of analytical solutions of the diffusion equation for `footprint prediction' is explored. Quantitative information about the `footprint', i.e., the…”
Get full text

Nocturnal CO2 exchange over a tall forest canopy associated with intermittent low-level jet activity by KARIPOT, A, LECLERC, M. Y, ZHANG, G, MARTIN, T, STARR, G, HOLLINGER, D, MCCAUGHEY, J. H, HENDREY, G. R

“…Nocturnal eddy-covariance carbon dioxide fluxes have uncertainties arising from non-stationary atmospheric processes. Low-level jets (LLJ) are one of the…”
Get full text

On the effect of clearcuts on turbulence structure above a forest canopy by ZHANG, G, THOMAS, Chr, LECLERC, M. Y, KARIPOT, A, GHOLZ, H. L, BINFORD, M, FOKEN, Th

“…The modification of the flow structure arising from the removal of large patches of trees in a managed forest plantation near Gainesville, Florida is…”
Get full text

Footprint prediction of scalar fluxes using a Markovian analysis by LECLERC, M. Y, THURTELL, G. W

“…The contribution of upwind sources to measurements of vertical scalar flux density as a function of fetch (`footprint') is predicted using a Markovian…”
Get full text

Experimental evaluation of analytical and Lagrangian surface-layer flux footprint models by FINN, D, LAMB, B, LECLERC, M. Y, HORST, T. W

“…Three surface-layer flux footprint models have been evaluated with the results of an SF sub(6) tracer release experiment specifically designed to test such…”
Get full text

Net ecosystem methane and carbon dioxide exchange in relation to heat and carbon balance in lowland tropical rice by Swain, C.K., Bhattacharyya, P., Singh, N.R., Neogi, S., Sahoo, R.K., Nayak, A.K., Zhang, G., Leclerc, M.Y.

“…•Annual net NEE was −7.47Mg C ha−1 in lowland tropical rice.•Cumulative annual net NEME was +419.68kg CH4 ha−1 in lowland tropical rice.•In lowland rice…”
Get full text

Mass exchange in the stable boundary layer by coherent structures by Cooper, D.I., Leclerc, M.Y., Archuleta, J., Coulter, R., Eichinger, W.E., Kao, C.Y.J., Nappo, C.J.

“…Observations of multi-dimensional water vapor structures in the first 75 m of the stable boundary layer (SBL) were made using a high resolution scanning Raman…”
Get full text