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In Canada's subarctic?the boreal ecosystem that spans most of mainland Canada?the temperature is climbing, and the snowpack is thinning. Previous research has shown that snow is disappearing even faster than sea ice.
We compared 7 years of local automated weather station (AWS) data to NCEP/NCAR reanalysis data to characterize the modern environment of Lake El'gygytgyn, in Chukotka Russia. We then used this comparison to estimate the air temperatures required to initiate and maintain multi-year lake-ice covers to aid in paleoclimate reconstructions of the 3.6 M years sediment record recovered from there. We present and describe data from our AWS from 2002–2008, which recorded air temperatures, relative humidity, precipitation, barometric pressure, and wind speed/direction, as well as subsurface soil moisture and temperature. Measured mean annual air temperature (MAAT) over this period was −10.4 °C with a slight warming trend...
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At sites where petrochemical releases have occurred comparatively recently (i.e., over the last 20 years), explicit age-dating is a viable approach. However, differentiating among multiparty contamination at sites with several decades of history may mandate a different allocation strategy, especially when there is an uncoordinated body of environmental data. At a location where a refinery operated for 11 months during World War II, and which has been used as a fuel distribution terminal over the ensuing 60 years, regulatory interest was triggered in 1997 when a sheen was detected discharging into the adjacent Yukon River. Our investigation combined disparate forensic tools with data visualization software to establish...
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According to the Koppen -Geiger climate classification, Hokkaido and central to southern Alaska are located at near southrn and northern borders of the subarctic region, respectively. River basins in Hokkaido and Alaska receive similar climatological and hydrological conditions of summer to autumn rainfall, winter snowfall and spring snowmelt. Here, hydrological characteristics of the Saromabetsu river basin (area, 277.0 km super(2)) and the Oikamanai river basin (area, 62.0 km super(2)) in Hokkaido are compared with those of the Tanana river basin (area, 6.6310 super(4) km super(2)) in Alaska. Hourly time series of river discharge, Q, and suspended sediment concentration, C, in runoff events offers the relationship...
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The characteristics of sediment discharge in the Yukon River, Alaska were investigated by monitoring water discharge, water turbidity and water temperature. The river-transported sediment, 90 wt.% or more, consists of silt and clay (grain size less than or equal to 62.5 mum), which probably originated in the glacier-covered mountains mostly in the Alaska Range. For early June to late August 1999, we continuously measured water turbidity and temperature near the estuary and in the middle of Yukon River by using self-recording turbidimeters and temperature data loggers. The water turbidity (ppm) was converted to suspended sediment concentration (SSC; mg/l) of river water, using a relation between simultaneous turbidity...
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Disinfection by-products (DBP) are formed when natural organic matter (NOM) in water reacts with a disinfectant, usually chlorine. DBPs are a health risk element and regulated under the Safe Drinking Water Act. A study was conducted to evaluate the characteristics of NOM that contribute to DBPs in 17 different drinking water systems in Alaska. In order to determine the nature of the organic matter contributing to DBPs, DBP formation potential was compared with standard water quality parameters such as UV-254, color and dissolved organic carbon (DOC), as well as pyrolysis-gas chromatography/mass spectrometry (GC/MS). Results showed strong correlations between UV-254 and DBP formation potential for all waters studied....
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We reconstructed late Holocene fluctuations of Kluane Lake in Yukon Territory from variations in bulk physical properties and carbon and nitrogen elemental and isotopic abundances in nine sediment cores. Fluctuations of Kluane Lake in the past were controlled by changes in climate and glaciers, which affected inflow of Slims and Duke rivers, the two largest sources of water flowing into the lake. Kluane Lake fluctuated within a narrow range, at levels about 25 m below the present datum, from about 5000 to 1300 cal yr BP. Low lake levels during this interval are probably due to southerly drainage of Kluane Lake to the Pacific Ocean, opposite the present northerly drainage to Bering Sea. Slims River, which today is...
map background search result map search result map Cottonwood Creek Ecological Assessment Multi-trophic resilience of boreal lake ecosystems to forest fires Characteristics of runoffs in subarctic river basins; a comparison between Alaska and Hokkaido Characteristics of sediment discharge in the subarctic Yukon River, Alaska Effects of Spatial Aggregation of Initial Conditions and Forcing Data on Modeling Snowmelt Using a Land Surface Scheme Impact of doubled CO2 on the interaction between the global and regional water cycles in four study regions Nitrogen retention in the hyporheic zone of a glacial river in interior Alaska Persistence and stability of macroinvertebrate communities in streams of Denali National Park, Alaska: implications for biological monitoring High-energy sedimentary processes in Kluane Lake, Yukon Territory Timing and cause of water level fluctuations in Kluane Lake, Yukon Territory, over the past 5000 years Use of Geochemical Forensics to Determine Release Eras of Petrochemicals to Groundwater, Whitehorse, Yukon Wrangell - St. Elias National Park and Preserve : Alaska : Water resources scoping report Effects of Spatial Aggregation of Initial Conditions and Forcing Data on Modeling Snowmelt Using a Land Surface Scheme Cottonwood Creek Ecological Assessment Use of Geochemical Forensics to Determine Release Eras of Petrochemicals to Groundwater, Whitehorse, Yukon Nitrogen retention in the hyporheic zone of a glacial river in interior Alaska High-energy sedimentary processes in Kluane Lake, Yukon Territory Timing and cause of water level fluctuations in Kluane Lake, Yukon Territory, over the past 5000 years Persistence and stability of macroinvertebrate communities in streams of Denali National Park, Alaska: implications for biological monitoring Multi-trophic resilience of boreal lake ecosystems to forest fires Characteristics of runoffs in subarctic river basins; a comparison between Alaska and Hokkaido Wrangell - St. Elias National Park and Preserve : Alaska : Water resources scoping report Characteristics of sediment discharge in the subarctic Yukon River, Alaska Impact of doubled CO2 on the interaction between the global and regional water cycles in four study regions