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Detailed observations of stream, soil, and groundwater chemistry were used to determine the role of fire, permafrost and snowmelt processes on the fluxes of carbon, nitrogen and major solutes from interior Alaskan catchments. We examined an experimentally burned watershed and two reference watersheds that differ in permafrost coverage (high, 53%; medium-burn, 18%; and low, 4%) during the FROSTFIRE prescribed burn in July 1999. The fire elevated stream nitrate concentrations for a short period during the first post-fire storm, but nitrate declined thereafter, suggesting that less severe fires that leave an intact riparian zone may have only a short-term effect on stream chemistry. Nevertheless, we found fundamental...
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SOC in northern high latitudes is highly vulnerable to disturbances Disturbances are an important component of the northern soil C cycle Soils in northern high latitudes could loose their long-term C sink character This synthesis addresses the vulnerability of the North American high-latitude soil organic carbon (SOC) pool to climate change. Disturbances caused by climate warming in arctic, subarctic, and boreal environments can result in significant redistribution of C among major reservoirs with potential global impacts. We divide the current northern high-latitude SOC pools into (1) near-surface soils where SOC is affected by seasonal freeze-thaw processes and changes in moisture status, and (2) deeper permafrost...
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There are comparatively few fossils that document the presence of the Pleistocene western camel (Camelops hesternus) in the unglaciated regions of Alaska and Yukon, northwestern North America (eastern Beringia). It has been previously reported on the basis of stratigraphic and radiocarbon data that this species was present within this region from the Sangamonian interglaciation (Marine Isotope Stage (MIS) 5) through the Last Glacial Maximum (LGM, MIS 2). However, the continued presence of western camel through the LGM is at odds with its ecological preferences as inferred from more southerly parts of the continent. Here we report 43 new radiocarbon dates on 34 western camel fossils from Alaska and Yukon, including...
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The extensive boreal biome is little studies relative to its global importance. Its high soil moisture and low temperatures result in large below-ground reservoirs of carbon (C) and nitrogen (N). Presently, such high-latitude ecosystems are undergoing the largest temperature increases in global warming. Change in soil temperature or moisture in the large pools of soil organic matter could fundamentally change ecosystem C and N budgets. Since 1990, we have conducted treeline studies in a small (800 ha) watershed in Noatak National Preserve, northwestern Alaska. Our objectives were to (1) gain an understanding of treeline dynamics, structure, and function; and (2) examine the effects of global climate change, particularly...
map background search result map search result map Mountain Pine Beetle in British Columbia Hunting, herding, fishing and gathering: indigenous peoples and renewable resource use in the Arctic Aerial surveys of belugas in Cook Inlet, Alaska, August 2006 Differential habitat selection by moose and elk in the Besa-Prophet area of northern British Columbia Sensitivity of northern peatland carbon dynamics to Holocene climate change High-energy sedimentary processes in Kluane Lake, Yukon Territory Yukon state of the environment  report : a Report on Environmental Indicators - 2014 Little Rancheria Caribou in the Yukon: Evaluation of Winter Habitat Quality and Habitat Use Comparison of Sockeye Salmon in the Kasilof Estuary and Columbian Estuary Treeline biogeochemistry and dynamics, Noatak National Preserve, northwestern Alaska Examining barriers and opportunities for sustainable adaptation to climate change in Interior Alaska Vulnerability of high-latitude soil organic carbon in North America to disturbance A 200-year perspective of climate variability and the response of white spruce in interior Alaska Export of carbon, nitrogen and major solutes from a boreal forest watershed: The influence of fire and permafrost Human Impact on Fire Regime in Interior Alaska High-resolution records detect human-caused changes to the boreal forest wildfire regime in interior Alaska High-energy sedimentary processes in Kluane Lake, Yukon Territory Comparison of Sockeye Salmon in the Kasilof Estuary and Columbian Estuary Export of carbon, nitrogen and major solutes from a boreal forest watershed: The influence of fire and permafrost High-resolution records detect human-caused changes to the boreal forest wildfire regime in interior Alaska Treeline biogeochemistry and dynamics, Noatak National Preserve, northwestern Alaska Aerial surveys of belugas in Cook Inlet, Alaska, August 2006 Examining barriers and opportunities for sustainable adaptation to climate change in Interior Alaska Differential habitat selection by moose and elk in the Besa-Prophet area of northern British Columbia A 200-year perspective of climate variability and the response of white spruce in interior Alaska Little Rancheria Caribou in the Yukon: Evaluation of Winter Habitat Quality and Habitat Use Yukon state of the environment  report : a Report on Environmental Indicators - 2014 Human Impact on Fire Regime in Interior Alaska Mountain Pine Beetle in British Columbia Hunting, herding, fishing and gathering: indigenous peoples and renewable resource use in the Arctic Sensitivity of northern peatland carbon dynamics to Holocene climate change Vulnerability of high-latitude soil organic carbon in North America to disturbance