Results 51 to 60 of about 1,860,518 (333)

Does increased spatial replication above heterogeneous agroforestry improve the representativeness of eddy covariance measurements? [PDF]

Biogeosciences
Spatial heterogeneity in terrestrial ecosystems compromises the accuracy of eddy covariance measurements. Examples of heterogeneous ecosystems are temperate agroforestry systems, which have been poorly studied by eddy covariance.
J. Á. Callejas-Rodelas, J. Á. Callejas-Rodelas, A. Knohl, A. Knohl, I. Mammarella, T. Vesala, T. Vesala, O. Peltola, C. Markwitz   +8 more
doaj   +1 more source

Upscaling key ecosystem functions across the conterminous United States by a water-centric ecosystem model [PDF]

, 2011
We developed a water-centric monthly scale simulation model (WaSSI-C) by integrating empirical water and carbon flux measurements from the FLUXNET network and an existing water supply and demand accounting model (WaSSI).
Caldwell, Peter, Chen, Jiquan, Cohen, Erika, Domec, Jean-Christophe, John, Ranjeet, McNulty, Steven G., Mu, Qiaozhen, Myers, Jennifer Moore, Noormets, Asko, Sun, Ge, Treasure, Emrys, Xiao, Jingfeng   +11 more
core   +4 more sources

A comparison of gap-filling algorithms for eddy covariance fluxes and their drivers

Geoscientific Instrumentation, Methods and Data Systems, 2020
. The errors and uncertainties associated with gap-filling algorithms of water, carbon, and energy fluxes data have always been one of the main challenges of the global network of microclimatological tower sites that use the eddy covariance (EC ...
A. Mahabbati, J. Beringer, M. Leopold, I. McHugh, J. Cleverly, P. Isaac, A. Izady   +6 more
semanticscholar   +1 more source

Modelling Amazonian forest eddy covariance data: a comparison of big leaf versus sun/shade models for the C-14 tower at Manaus I. Canopy photosynthesis [PDF]

Acta Amazonica, 2006
In this study, we concentrate on modelling gross primary productivity using two simple approaches to simulate canopy photosynthesis: "big leaf" and "sun/shade" models.
Lina Mercado, Jon Lloyd, Fiona Carswell, Yadvinder Malhi, Patrick Meir, Antonio Donato Nobre   +5 more
doaj   +1 more source

Howland Forest, ME, USA: Multi-Gas Flux (CO₂, CH₄, N₂O) Social Cost Product Underscores Limited Carbon Proxies

Land, 2021
Forest carbon sequestration is a widely accepted natural climate solution. However, methods to determine net carbon offsets are based on commercial carbon proxies or CO2 eddy covariance research with limited methodological comparisons. Non-CO2 greenhouse
Bruno D. V. Marino, Nahuel Bautista, Brandt Rousseaux   +2 more
doaj   +1 more source

Improved processing methods for eddy covariance measurements in calculating sensible heat fluxes at glacier surfaces

Journal of Glaciology
Bulk aerodynamic methods have been shown to perform poorly in computing turbulent heat fluxes at glacier surfaces during shallow katabatic winds. Katabatic surface layers have different wind shear and flux profiles to the surface layers for which the ...
Cole Lord-May, Valentina Radić
doaj   +1 more source

Estimating scalar turbulent fluxes with slow-response sensors in the stable atmospheric boundary layer [PDF]

Atmospheric Chemistry and Physics
Conventional and recently developed approaches for estimating turbulent scalar fluxes under stable atmospheric conditions are evaluated, with a focus on gases for which fast sensors are not readily available.
M. Allouche, M. Allouche, V. I. Sevostianov, V. I. Sevostianov, E. Zahn, M. A. Zondlo, M. A. Zondlo, N. L. Dias, G. G. Katul, J. D. Fuentes, E. Bou-Zeid   +10 more
doaj   +1 more source

Calculating canopy stomatal conductance from eddy covariance measurements, in light of the energy budget closure problem

Biogeosciences, 2020
. Canopy stomatal conductance is commonly estimated from eddy covariance measurements of the latent heat flux (LE) by inverting the Penman–Monteith equation.
R. Wehr, S. Saleska
semanticscholar   +1 more source

Measuring the biosphere-atmosphere exchange of total reactive nitrogen by eddy covariance [PDF]

Biogeosciences, 2012
The (net) exchange of reactive nitrogen (N_r) with the atmosphere is an important driver for ecosystem productivity and greenhouse gas exchange.
C. Ammann, V. Wolff, O. Marx, C. Brümmer, A. Neftel   +4 more
doaj   +1 more source

Canopy uptake dominates nighttime carbonyl sulfide fluxes in a boreal forest [PDF]

, 2017
Nighttime vegetative uptake of carbonyl sulfide (COS) can exist due to the incomplete closure of stomata and the light independence of the enzyme carbonic anhydrase, which complicates the use of COS as a tracer for gross primary productivity (GPP).
Aalto, J., Aalto, J., Chen, H., Chen, H., Franchin, A., Franchin, A., Kolari, P., Kooijmans, L. M. J., Mammarella, I., Maseyk, K., Seibt, U., Sun, W., Valli, G., Vecchi, R., Vesala, T., Vesala, T.   +15 more
core   +7 more sources