23 dossier(s) trouvé(s) portant l’étiquette "carbon fluxes" (les projets pluriannuels sont regroupés):
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Boreal Forest Carbon Balance Studies
chercheur principal: Layden, Ronald E.
Année(s) de permis: 2017
Résumé: The objective of this project is to increase the understanding of taiga carbon balance of terrestrial and aquatic ecosystems and predict into the future the impacts of climate warming on these systems. The exchange of carbon gases between the taiga and atmosphere is a significant component of the carbon balance and is dependent upon vegetation cover. The description below for the tundra site at...


Effects of fire on peatland permafrost stability and carbon cycling
chercheur principal: Olefeldt, David
Année(s) de permis: 2017 2016 2015
Résumé: The project team intend to study carbon cycling in peatland catchments, in order to determine whether the interactions between wildfire and permafrost thaw causes increased release of greenhouse gases from peatlands and aquatic ecosystems to the atmosphere, and thus cause amplified climate change. Given the overall objective of the project, the team intend to address five research questions: ...


Quantifying carbon fluxes and budgets of boreal forest-tundra landscapes under the influence of rapidly changing permafrost regimes
chercheur principal: Sonnentag, Oliver
Année(s) de permis: 2022 2021 2019 2018 2017 2016 2015 2014 2013
Résumé: The objectives of this research project are to: 1) determine if the net effect of permafrost thawing-induced biophysical and biogeochemical feedbacks to the climate system; 2) determine how these two types of feedback differ between the discontinuous and continuous permafrost zones; 3) determine if the reported decrease (increase) in net CO2 (CH4) exchange based on plot- (<1m2) and ecosystem-scale...


Impact of permafrost thaw and wildfire on carbon storage in peatlands
chercheur principal: Turetsky, Merritt R.
Année(s) de permis: 2014 2013
Résumé: The research team aims to study if permafrost thaw in peatlands is linked to rapid losses of organic matter. The field work will focus on extracting a number of cores from different peatland sites that differ in their permafrost status and in fire history. By examining the peat layers in the core the team will be able to reconstruct the history of the site and to link changes in permafrost conditi...


Impacts of recent climate warming on Canada’s northern aquatic ecosystems
chercheur principal: Blais, Jules M
Année(s) de permis: 2014
Résumé: The objectives of this research project are: 1) to determine the impact of shoreline expansion and forest/peat submergence from thawing permafrost on contaminant and carbon fluxes to lakes in the Yellowknife region; 2) to develop novel approaches to track terrestrial organic matter sources in lakes, in order to assess how climate warming and permafrost thaw are affecting the delivery of terrestr...


Structure, Carbon Dynamics, and Silvichronology of Boreal Forests
chercheur principal: Osawa, Akira
Année(s) de permis: 2019 2018 2016 2015 2013 2012 2011 2010 2009 2008 2007 2006
Résumé: Main objective of the field work is to collect data in jack pine and black spruce forests on annual movement of organic matter and carbon. Additional objective is to conduct a regional study of stand development and its relationship to environmental factors in a several-square-kilometer study area of mostly black spruce. Five methods will be used. 1) Soil and air temperature will be measured...


Geological carbon in the Mackenzie River Basin: Sources and sinks of atmospheric carbon dioxide
chercheur principal: Hilton, Robert G
Année(s) de permis: 2017 2013 2011 2010 2009
Résumé: The objective of this study are to quantify the amount of chemical weathering that takes place in the Mackenzie River Basin, to quantify how much weathering of silicate rocks is done by carbonic acid versus sulfuric acid, and to quantify the chemical weathering of fossil organic carbon. The overall aim is therefore to assess the carbon balance of the whole river basin and to place constraints on ...


Recent changes in carbon source-sink relationships and greenhouse gas emissions in forest and peatland ecosystems along the Mackenzie Valley region of Canada
chercheur principal: Bhatti, Jagtar
Année(s) de permis: 2011 2010 2009 2008 2007
Résumé: The objectives of this study are to: assess interannual and seasonal variations and key processes controlling CO2, CH4 and N2O dynamics along the Mackenzie Valley latitudinal gradient; investigate the amount and character of greenhouse gases (GHGs) released; understand physiographic and hydrodynamic conditions that control or influence soil GHGs (distributions and emissions). The Mackenzie vall...


Carbon dynamics in chronosequence of boreal forest ecosystems: a production ecological approach
chercheur principal: Osawa, Akira
Année(s) de permis: 2017 2005 2004 2003 2002 2001
Résumé: Northern forests are closely connected to the issue of global warming because they are likely to absorb much of the carbon dioxide that is emitted into the air by humans. The amount that these forests absorb, however, is not clear. The main objectives of the 2005 field season are to collect data on the annual growth of fine roots, and to further examine the rate of soil respiration. Both of these...


Mapping and Modeling Carbon Flux in Northern Canada
chercheur principal: Chen, Wenjun
Année(s) de permis: 2005 2004
Résumé: The objectives of the research are to become familiar with the vegetation and landforms of northern Canada, and to collect vegetation and biophysical data for ground truth of remote sensing and carbon modeling activities. The Dempster Highway provides a...


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