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Summary The Little Susitna River is an important recreational resource within south-central Alaska. The river supports five species of salmon and very popular Chinook and coho salmon fisheries. In 2004, 20,000 angler days were spent harvesting 45,000 coho, which is the second highest harvest level in south-central Alaska. Rapid increases in Matanuska-Susitna Borough populations and the river’s popularity have resulted in increased residential development and recreational use along the river. There is a potential for residential development and recreational use to cause a decrease in water quality and fish habitat. This study is the first step in characterizing the Little Susitna River from the Edgerton Road...
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Climate and environmental changes are having profound impacts on Arctic river basins, but the biogeochemical response remains poorly understood. To examine the effect of ice formation on temporal variations in composition and fluxes of carbon and nutrient species, monthly water and particulate samples collected from the lower Yukon River between July 2004 and September 2005 were measured for concentrations of organic and inorganic C, N, and P, dissolved silicate (Si(OH)), and stable isotope composition (δD and δO). All organic carbon and nutrient species had the highest concentration during spring freshet and the lowest during the winter season under the ice, indicating dominant sources from snowmelt and flushing...
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We used remotely sensed weekly snow water equivalent (SWE) and snow cover extent (SCE) data to investigate streamflow response to seasonal snowcover change over the Yukon watershed. We quantified the seasonal cycles and variations of snowcover (both SWE and SCE) and river streamflow, and identified a clear correspondence of river discharge to seasonal snowcover change. We also examined and compared the weekly mean streamflow with the weekly basin SWE and SCE. The results revealed a strong relation between the streamflow and snowcover change during the spring melt season. This relationship provides a practical procedure of using remotely sensed snowcover information for snowmelt runoff estimation over the large northern...
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High-latitude lakes are important for terrestrial carbon dynamics and waterfowl habitat driving a need to better understand controls on lake area changes. To identify the existence and cause of recent lake area changes in the Yukon Flats, a region of discontinuous permafrost in north central Alaska, we evaluate remotely sensed imagery with lake water isotope compositions and hydroclimatic parameters. Isotope compositions indicate that mixtures of precipitation, river water, and groundwater source ~95% of the studied lakes. The remaining minority are more dominantly sourced by snowmelt and/or permafrost thaw. Isotope-based water balance estimates indicate 58% of lakes lose more than half of inflow by evaporation....
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Growing season CH4 fluxes were monitored over a two year period following the start of ecosystem-scale manipulations of water table position and surface soil temperatures in a moderate rich fen in interior Alaska. The largest CH4 fluxes occurred in plots that received both flooding (raised water table position) and soil warming, while the lowest fluxes occurred in unwarmed plots in the lowered water table treatment. A combination of treatment and soil hydroclimate variables explained more than 70% of the variation in ln-transformed CH4 fluxes, with mean daily water table position representing the strongest predictor. We used quantitative PCR of the -subunit of mcr operon to explore the influence of soil climate...
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Boreal ecosystems store significant quantities of organic carbon (C) that may be vulnerable to degradation as a result of a warming climate. Despite their limited coverage on the landscape, streams play a significant role in the processing, gaseous emission, and downstream export of C, and small streams are thought to be particularly important because of their close connection with the surrounding landscape. However, ecosystem carbon studies do not commonly incorporate the role of the aquatic conduit. We measured carbon dioxide (CO2) and methane (CH4) concentrations and emissions in a headwater stream network of interior Alaska underlain by permafrost to assess the potential role of stream gas emissions in the regional...
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This report contains water-quality and sediment-quality data from samples collected in the Yukon River Basin from March through September during the 2004 water year (WY). Samples were collected throughout the year at five stations in the basin (three on the main stem Yukon River, one each on the Tanana and Porcupine Rivers). A broad range of physical, chemical, and biological analyses are presented.
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This study systematically analyzes long-term (1973–2011) daily flow data collected near the Mackenzie basin outlet. It clearly defines the variability, extreme events, and changes in daily flow records over the past 4 decades. The results of this study accurately determine the seasonal cycle of river discharge, including the range of highest and lowest daily flows. The interannual variation of daily flow is generally small in the cold season, highest in the spring melt period, and large over the summer months mainly due to rainfall storm activities and associated floods. This study also shows that Mackenzie River flow regime has changed over the past 4 decades due to climate variation, with the advance of snowmelt...
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This report summarizes instream flow protection and related activities of the Alaska Department of Fish and Game in 2012. The status of reservation of water applications by other agencies and the private sector in Alaska is also presented.
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OVERVIEW This report contains water-quality data collected from 84 sites in Tanana River basin during water years 2004 through 2006 (October 2003 through September 2006) as part of a cooperative study between the U.S. Geological Survey (USGS) and Alaska Department of Environmental Conservation (ADEC) Alaska Monitoring and Assessment Program (AKMAP), supported in part through the U.S. Environmental Protection Agency (USEPA) Office of Water, Cooperative Assistance Agreement X7-97078801. A broad range of chemical analyses are presented for 93 sets of samples collected at 59 tributaries to the Tanana River and at 25 locations along the mainstem. These data are to provide a means to assess baseline characteristics and...
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This report contains water-quality and sediment-quality data from samples collected in the Yukon River basin from March through September during the 2002 water year (WY). Samples were collected throughout the year at five stations in the basin (three on the main stem Yukon River, one each on the Tanana and Porcupine Rivers ). A broad range of physical, chemical, and biological analyses are presented.
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The Yukon River Inter-Tribal Watershed Council and the U.S. Geological Survey developed a water-quality monitoring program to address a shared interest in the water quality of the Yukon River and its relation to climate. This report contains water-quality data from samples collected in the Yukon River Basin during water years 2006 through 2008. A broad range of chemical analyses from 44 stations throughout the YRB are presented. On August 8, 2009 the USGS signed a Memorandum of Understanding with the Yukon River Inter-Tribal Watershed Council representing the culmination of 5 years of dedicated efforts to forge a working collaboration and partnership with expectations of continuing into the foreseeable future. The...
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We applied nonparametric statistical techniques to historical streamflow data from five glacierized and four nonglacierized watersheds in southwest Yukon and northwestern British Columbia, Canada, to determine whether rivers with and without catchment glacial cover respond in significantly different ways to a warming climate. The analysis was posed in terms of contrasts between the two groups with respect to long-term trends in annual time series of total river flow volume. We found that glacier-fed rivers grew larger and nival streams progressively smaller over the historical record under an observed regional warming trend. Although some of these trend effects are subtle, the overall result was statistically significant...
map background search result map search result map Controls on recent Alaskan lake changes identified from water isotopes and remote sensing Emissions of carbon dioxide and methane from a headwater stream network of interior Alaska Annual estimates of water and solute export from 42 tributaries to the Yukon River Sources and export fluxes of inorganic and organic carbon and nutrient species from the seasonally ice-covered Yukon River Yukon River streamflow response to seasonal snow cover changes Short-term response of methane fluxes and methanogen activity to water table and soil warming manipulations in an Alaskan peatland Suspended sediment and carbonate transport in the Yukon River Basin, Alaska: Fluxes and potential future responses to climate change Water Quality in the Tanana River Basin, Alaska, Water Years 2004-06 Water and sediment quality in the Yukon River basin, Alaska, during water year 2002 Water and sediment quality in the Yukon River basin, Alaska, during water year 2004 Water Quality in the Yukon River Basin, Alaska, Water Years 2006 - 2008 Arctic Network Stream Communities and Ecosystems Protocol Development Summary The Little Susitna River—An ecological assessment. Final Report for the Alaska Department of Environmental Conservation Variability and extreme of Mackenzie River daily discharge during 1973–2011 Wandering gravel-bed rivers and high-constructive stable channel sandy fluvial systems in the Ross River area, Yukon Territory, Canada Glacial Control of Water Resource and Related Environmental Responses to Climatic Warming: Empirical Analysis Using Historical Streamflow Data from Northwestern Canada Limnological characteristics of Canada's poorly known large lakes Restoration of the Caribou Creek watershed Wandering gravel-bed rivers and high-constructive stable channel sandy fluvial systems in the Ross River area, Yukon Territory, Canada Short-term response of methane fluxes and methanogen activity to water table and soil warming manipulations in an Alaskan peatland Emissions of carbon dioxide and methane from a headwater stream network of interior Alaska Restoration of the Caribou Creek watershed The Little Susitna River—An ecological assessment. Final Report for the Alaska Department of Environmental Conservation Controls on recent Alaskan lake changes identified from water isotopes and remote sensing Glacial Control of Water Resource and Related Environmental Responses to Climatic Warming: Empirical Analysis Using Historical Streamflow Data from Northwestern Canada Water Quality in the Tanana River Basin, Alaska, Water Years 2004-06 Arctic Network Stream Communities and Ecosystems Protocol Development Summary Water and sediment quality in the Yukon River basin, Alaska, during water year 2002 Water Quality in the Yukon River Basin, Alaska, Water Years 2006 - 2008 Yukon River streamflow response to seasonal snow cover changes Suspended sediment and carbonate transport in the Yukon River Basin, Alaska: Fluxes and potential future responses to climate change Water and sediment quality in the Yukon River basin, Alaska, during water year 2004 Annual estimates of water and solute export from 42 tributaries to the Yukon River Sources and export fluxes of inorganic and organic carbon and nutrient species from the seasonally ice-covered Yukon River Variability and extreme of Mackenzie River daily discharge during 1973–2011 Limnological characteristics of Canada's poorly known large lakes