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Filters: Tags: Projecting future states 1-Predict or Map Impact Changing Permafrost (X)

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Peat in the discontinuous permafrost zone contains a globally significant reservoir of carbon that has undergone multiple permafrost-thaw cycles since the end of the mid-Holocene (~3700 years before present). Periods of thaw increase C decomposition rates which leads to the release of CO2 and CH4 to the atmosphere creating potential climate feedback. To determine the magnitude and direction of such feedback, we measured CO2 and CH4 emissions and modeled C accumulation rates and radiative fluxes from measurements of two radioactive tracers with differing lifetimes to describe the C balance of the peatland over multiple permafrost-thaw cycles since the initiation of permafrost at the site. At thaw features, the balance...
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Northern high-latitude carbon sources and sinks, including those resulting from degrading permafrost, are thought to be sensitive to the rapidly warming climate. Because the near-surface atmosphere integrates surface fluxes over large (∼500-1000 km) scales, atmospheric monitoring of carbon dioxide (CO2) and methane (CH4) mole fractions in the daytime mixed layer is a promising method for detecting change in the carbon cycle throughout boreal Alaska. Here we use CO2 and CH4 measurements from a NOAA tower 17 km north of Fairbanks, AK, established as part of NASA's Carbon in Arctic Reservoirs Vulnerability Experiment (CARVE), to investigate regional fluxes of CO2 and CH4 for 2012-2014. CARVE was designed to use aircraft...
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The permafrost component of the cryosphere is changing dramatically, but the permafrost region is not well monitored and the consequences of change are not well understood. Changing permafrost interacts with ecosystems and climate on various spatial and temporal scales. The feedbacks resulting from these interactions range from local impacts on topography, hydrology, and biology to complex influences on global scale biogeochemical cycling. This review contributes to this focus issue by synthesizing its 28 multidisciplinary studies which provide field evidence, remote sensing observations, and modeling results on various scales. We synthesize study results from a diverse range of permafrost landscapes and ecosystems...


map background search result map search result map Investigating Alaskan methane and carbon dioxide fluxes using measurements from the CARVE tower Differential response of carbon fluxes to climate in three peatland ecosystems that vary in the presence and stability of permafrost Rapid carbon loss and slow recovery following permafrost thaw in boreal peatlands Distribution and growth of thaw slumps in the Richardson Mountains–Peel Plateau region, northwestern Canada Thermokarst rates intensify due to climate change and forest fragmentation in an Alaskan boreal forest lowland ‘Warm’Tundra: Atmospheric and Near‐Surface Ground Temperature Inversions Across an Alpine Treeline in Continuous Permafrost, Western Arctic, Canada Hydrologic Impacts of Thawing Permafrost—A Review Limited contribution of permafrost carbon to methane release from thawing peatlands Experimentation of Mitigation Techniques to Reduce the Effects of Permafrost Degradation on Transportation Infrastructures at Beaver Creek Experimental Road Site, Alaska Highway, Yukon Towards improved parameterization of a macroscale hydrologic model in a discontinuous permafrost boreal forest ecosystem Impacts of variations in snow cover on permafrost stability, including simulated snow management, Dempster Highway, Peel Plateau, Northwest Territories Late Quaternary paleoenvironmental records from the Chatanika River valley near Fairbanks (Alaska) InSAR Monitoring of Alaska Highway Instability in Permafrost Regions Near Beaver Creek, Yukon Late Quaternary paleoenvironmental records from the Chatanika River valley near Fairbanks (Alaska) Experimentation of Mitigation Techniques to Reduce the Effects of Permafrost Degradation on Transportation Infrastructures at Beaver Creek Experimental Road Site, Alaska Highway, Yukon Differential response of carbon fluxes to climate in three peatland ecosystems that vary in the presence and stability of permafrost Towards improved parameterization of a macroscale hydrologic model in a discontinuous permafrost boreal forest ecosystem Thermokarst rates intensify due to climate change and forest fragmentation in an Alaskan boreal forest lowland Investigating Alaskan methane and carbon dioxide fluxes using measurements from the CARVE tower Limited contribution of permafrost carbon to methane release from thawing peatlands Impacts of variations in snow cover on permafrost stability, including simulated snow management, Dempster Highway, Peel Plateau, Northwest Territories Rapid carbon loss and slow recovery following permafrost thaw in boreal peatlands Distribution and growth of thaw slumps in the Richardson Mountains–Peel Plateau region, northwestern Canada ‘Warm’Tundra: Atmospheric and Near‐Surface Ground Temperature Inversions Across an Alpine Treeline in Continuous Permafrost, Western Arctic, Canada Hydrologic Impacts of Thawing Permafrost—A Review