Results 41 to 50 of about 53,109 (325)

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

Mass fluxes and isofluxes of methane (CH4) at a New Hampshire fen measured by a continuous wave quantum cascade laser spectrometer [PDF]

, 2012
We have developed a mid‐infrared continuous‐wave quantum cascade laser direct‐absorption spectrometer (QCLS) capable of high frequency (≥1 Hz) measurements of 12CH4 and 13CH4 isotopologues of methane (CH4) with in situ 1‐s RMS image precision of 1.5 ...
Crill, Patrick M., Goodrich, Jordan P., Lee, Ben H., McManus, J. Barry, Nelson, David D., Santoni, Gregory W., Varner, Ruth K., Wofsy, Steven C., Zahniser, Mark S.   +8 more
core   +3 more sources

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

Upscaling fluxes from towers to regions, continents and global scales using datadriven approaches [PDF]

, 2011
Quantifying the current carbon cycle of terrestrial ecosystems requires that we translate spatially sparse measurements into consistent, gridded flux estimates at the regional scale.
Davis, Kenneth J., Keller, Klaus, Saliendra, Nicanor Z., Urban, Nathan M., Xiao, Jingfeng   +4 more
core   +6 more sources

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

Comparative measurements of carbon dioxide fluxes from two nearby towers in a central Amazonian rainforest: the Manaus LBA site [PDF]

, 2002
Forests around Manaus have staged the oldest and the longest forest-atmosphere CO2 exchange studies made anywhere in the Amazon. Since July 1999 the exchange of CO2, water, and energy, as well as weather variables, have been measured almost continuously ...
Araújo, A.C., Culf, A.D., Dallarosa, R., Elbers, J.A., Gash, J.H.C., Kabat, P., Kruijt, B., Manzi, A.O., Nobre, A.D., Randow, C., von, Stefani, P., Valentini, R.   +11 more
core   +2 more sources

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

Science to Commerce: A Commercial-Scale Protocol for Carbon Trading Applied to a 28-Year Record of Forest Carbon Monitoring at the Harvard Forest

Land, 2021
Forest carbon sequestration offset protocols have been employed for more than 20 years with limited success in slowing deforestation and increasing forest carbon trading volume. Direct measurement of forest carbon flux improves quantification for trading
Nahuel Bautista, Bruno D. V. Marino, J. William Munger   +2 more
doaj   +1 more source