Search Results - "Roulet, N. T"

Environmental correlates of peatland carbon fluxes in a thawing landscape: do transitional thaw stages matter? by Malhotra, A, Roulet, N. T

“…Peatlands in discontinuous permafrost regions occur as a mosaic of wetland types, each with variable sensitivity to climate change. Permafrost thaw further…”
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Ecosystem respiration in a cool temperate bog depends on peat temperature but not water table by Lafleur, P.M, Moore, T.R, Roulet, N.T, Frolking, S

“…Ecosystem respiration (ER) is an important but poorly understood part of the carbon (C) budget of peatlands and is controlled primarily by the thermal and…”
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The effect of atmospheric turbulence and chamber deployment period on autochamber CO2 and CH4 flux measurements in an ombrotrophic peatland by Lai, D Y. F, Roulet, N T, Humphreys, E R, Moore, T R, Dalva, M

“…Accurate quantification of soil-atmosphere gas exchange is essential for understanding the magnitude and controls of greenhouse gas emissions. We used an…”
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The global carbon cycle in the Canadian Earth system model (CanESM1): Preindustrial control simulation by Christian, J. R., Arora, V. K., Boer, G. J., Curry, C. L., Zahariev, K., Denman, K. L., Flato, G. M., Lee, W. G., Merryfield, W. J., Roulet, N. T., Scinocca, J. F.

“…The preindustrial carbon cycle is described for the Canadian Centre for Climate Modelling and Analysis Earth system model (CanESM1). The interhemispheric…”
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Methane fluxes from three peatlands in the La Grande Rivière watershed, James Bay lowland, Canada by Pelletier, L., Moore, T. R., Roulet, N. T., Garneau, M., Beaulieu-Audy, V.

“…Methane fluxes were measured on vegetated surfaces (2003) and pools (2004) of three peatlands (LG1‐LG2‐LG3) located 30, 100, and 200 km along a transect from…”
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McGill wetland model: evaluation of a peatland carbon simulator developed for global assessments by St-Hilaire, F., Wu, J., Roulet, N. T., Frolking, S., Lafleur, P. M., Humphreys, E. R., Arora, V.

“…We developed the McGill Wetland Model (MWM) based on the general structure of the Peatland Carbon Simulator (PCARS) and the Canadian Terrestrial Ecosystem…”
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Spatially explicit simulation of peatland hydrology and carbon dioxide exchange: Influence of mesoscale topography by Sonnentag, O., Chen, J. M., Roulet, N. T., Ju, W., Govind, A.

“…Carbon dynamics in peatlands are controlled, in large part, by their wetness as defined by water table depth and volumetric liquid soil moisture content. A…”
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The direct and indirect effects of inter-annual meteorological variability on ecosystem carbon dioxide exchange at a temperate ombrotrophic bog by Teklemariam, T.A., Lafleur, P.M., Moore, T.R., Roulet, N.T., Humphreys, E.R.

“…▶ Effects of meteorology on inter-annual CO 2 flux variability was studied by multiple linear regression. ▶ Functional change was detected as year-to-year…”
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Do pool surface area and depth control CO2 and CH4 fluxes from an ombrotrophic raised bog, James Bay, Canada? by McEnroe, N. A., Roulet, N. T., Moore, T. R., Garneau, M.

“…The relationship between the exchange of CO2 and CH4 and the surface area and depth of 16 pools on a northern peatland was investigated over 2 years…”
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Annual cycle of CO2 exchange at a bog peatland by Lafleur, P. M., Roulet, N. T., Admiral, S. W.

“…Eddy covariance measurements of the carbon dioxide flux from an ombrotrophic bog near Ottawa, Canada, were made between June 1, 1998, and May 31, 1999. Net…”
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Impact of long-term drainage on summer groundwater flow patterns in the Mer Bleue peatland, Ontario, Canada by Kopp, B. J, Fleckenstein, J. H, Roulet, N. T, Humphreys, E, Talbot, J, Blodau, C

“…Long-term impacts of drier conditions on the hydrology of northern peatlands are poorly understood. We used long-term drainage near a historic drainage ditch,…”
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Using direct and indirect measurements of leaf area index to characterize the shrub canopy in an ombrotrophic peatland by Sonnentag, O., Talbot, J., Chen, J.M., Roulet, N.T.

“…Leaf area index (LAI) is an important ecological parameter that characterizes the interface between a vegetation canopy and the atmosphere. Indirect…”
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Hydrology and dissolved organic carbon biogeochemistry in an ombrotrophic bog by Fraser, C. J. D., Roulet, N. T., Moore, T. R.

“…At the Mer Bleue bog, Ontario, Canada, DOC export measured at the basin outflow was −8·3 ± 3·7 g C m−2 yr−1, and DOC loading via precipitation was estimated to…”
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Overriding control of methane flux temporal variability by water table dynamics in a Southern Hemisphere, raised bog by Goodrich, J. P., Campbell, D. I., Roulet, N. T., Clearwater, M. J., Schipper, L. A.

“…There are still large uncertainties in peatland methane flux dynamics and insufficient understanding of how biogeochemical processes scale to ecosystems. New…”
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Uncertainty in predicting the effect of climatic change on the carbon cycling of Canadian peatlands by MOORE, T. R, ROULET, N. T, WADDINGTON, J. M

“…Northern peatlands play an important role globally in the cycling of C, through the exchange of CO2 with the atmosphere, the emission of CH4, the production…”
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PEATLANDS, CARBON STORAGE, GREENHOUSE GASES, AND THE KYOTO PROTOCOL: PROSPECTS AND SIGNIFICANCE FOR CANADA by Roulet, Nigel T.

“…The Kyoto Protocol accepts terrestrial sinks for greenhouse gases (GHGs) as offsets for fossil fuel emissions. Only carbon sequestered in living biomass from…”
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Groundwater flow patterns in a large peatland by Fraser, C.J.D., Roulet, N.T., Lafleur, M.

“…Groundwater flow patterns and geochemistry were studied in the Mer Bleue bog, near Ottawa, Ontario, Canada. Groundwater flow patterns alternated between…”
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Methane efflux from boreal wetlands: Theory and testing of the ecosystem model Ecosys with chamber and tower flux measurements by Grant, R. F., Roulet, N. T.

“…A robust model of CH4 emission from terrestrial ecosystems should be capable of simulating the temporal and spatial variability that characterizes field…”
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Carbon balance of a boreal patterned peatland by Waddington, J.M, Roulet, N.T

“…Summary Measurements of the spatial variability of methane (CH4) emissions, net CO2 ecosystem exchange (NEE), and dissolved carbon (CH4, CO2, and DOC) were…”
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Using MODIS derived fPAR with ground based flux tower measurements to derive the light use efficiency for two Canadian peatlands by Connolly, J., Roulet, N. T., Seaquist, J. W., Holden, N. M., Lafleur, P. M., Humphreys, E. R., Heumann, B. W., Ward, S. M.

“…We used satellite remote sensing data; fraction of photosynthetically active radiation absorbed by vegetation (fPAR) from the Moderate Resolution Imaging…”
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