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Changes in air temperature, precipitation, and, in some cases, glacial runoff affect the timing of river flow in watersheds of western Canada. We present a method to detect streamflow phase shifts in pluvial, nival, and glacial rivers. The Kendall-Theil robust lines yield monotonic trends in normalized sequent 5-day means of runoff in nine river basins of western Canada over the period 1960?2006. In comparison to trends in the timing of the date of annual peak flow and the center of volume, two other less robust metrics often used to infer streamflow timing changes, our approach reveals more detailed structure on the nature of these changes. For instance, our trend analyses reveal extension of the warm hydrological...
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The particulate organic matter in < 63 µm surface sediments from the Mackenzie River and its main tributaries was studied using Rock-Eval pyrolysis and organic petrology. The organic matter in the sediments is dominated by refractory residual organic carbon (RC) of mainly terrigenous nature, as indicated by abundant inertinite, vitrinite, and type III kerogen. Sediments from the tributaries contained significantly more algal-derived organic matter than from the main channel of the river, highlighting the importance of low-energy system dynamics in the tributaries, which allows modest algal production, more accumulation, and better preservation of autochthonous organic matter. This is particularly true for tributaries...
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Modern diatom assemblages were related to surface water chemistry from 42 lakes in the southwestern Yukon and in northern British Columbia. The lakes were alkaline (pH ranged from 7.5 to 9.4) with high specific conductance (mean = 379 muS/cm). The lakes spanned a relatively wide range of trophic conditions, with the majority being oligotrophic or meso-eutrophic. Lake water depth, alkalinity, lake surface area, and Mg [magnesium] accounted for most of the variation in the diatom assemblages. Diatom assemblages most closely resembled those of the southern interior of British Columbia, where high conductance lakes are numerous, although many of the taxa were common to other northern regions, including Siberia, Alaska...
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Summary This study represents the first attempt to examine the spatial and seasonal variations of the surface water budget by using state-of-the-art datasets for sixteen large Canadian drainage basins with a total area of 3.2 million km2. The datasets used include two precipitation grids produced using measurements and reanalysis models, land surface evapotranspiration and water surface evaporation estimated using the EALCO model, streamflow measured at hydrometric stations, and total water storage change derived from GRACE satellite observations. The monthly water imbalance resulted from these datasets varied from 7.0 mm month−1 to 21 mm month−1 among the studied basins, which was 30% on average of the corresponding...
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The 2010 field season marked the fifth year of development of the flowing waters portion of the Central Alaska Network (CAKN) Inventory and Monitoring Program, also known as the Vital Signs Program. Data collection occurred in both Wrangell-St. Elias National Park and Preserve (WRST) and in Denali National Park and Preserve (DENA). The purposes of the study were to 1) continue to refine field protocols and logistics related to the collection of relevant data in DENA and WRST streams and rivers; 2) implement a multi-panel sampling design in WRST; 3) begin sampling GRTS-selected synoptic sites in DENA, and 4) implement the long-term flowing water monitoring program. The data collected included biological (benthic...
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In order to evaluate the impact of natural organic matter (NOM) on drinking water, the hydrology of the Caribou-Poker Creeks Research Watershed (CPCRW) was considered. The CPCRW provided an excellent opportunity to investigate contaminant transport as it relates to hydrology in a well studied, discontinuous permafrost environment. The seasonal variation of organic chemistry of three different water sources (i.e. ground water, artesian spring and stream) was studied during the course of the year 2001. This thesis comprises three chapters, each of which seeks to gain a better understanding of the contaminant transport pathways in a boreal watershed, Caribou Poker Creeks Research Watershed. The hypothesis of Chapter...
map background search result map search result map Detection of runoff timing changes in pluvial, nival, and glacial rivers of western Canada Surface-sediment diatom assemblages and water chemistry from 42 subarctic lakes in the southwestern Yukon and northern British Columbia, Canada Recent changes in patterns of western Canadian river flow and association with climatic drivers The long-term response of stream flow to climatic warming in headwater streams of interior Alaska Assessment of water budget for sixteen large drainage basins in Canada Effects of soil moisture and water depth on ERS SAR backscatter measurements from an Alaskan wetland complex Characterization of organic matter in surface sediments of the Mackenzie River Basin, Canada Predicting contaminant transport pathways in the Caribou-Poker Creek Research Watershed Central Alaska Network flowing waters monitoring program: 2010 annual report The long-term response of stream flow to climatic warming in headwater streams of interior Alaska Predicting contaminant transport pathways in the Caribou-Poker Creek Research Watershed Surface-sediment diatom assemblages and water chemistry from 42 subarctic lakes in the southwestern Yukon and northern British Columbia, Canada Effects of soil moisture and water depth on ERS SAR backscatter measurements from an Alaskan wetland complex Central Alaska Network flowing waters monitoring program: 2010 annual report Assessment of water budget for sixteen large drainage basins in Canada Detection of runoff timing changes in pluvial, nival, and glacial rivers of western Canada Characterization of organic matter in surface sediments of the Mackenzie River Basin, Canada Recent changes in patterns of western Canadian river flow and association with climatic drivers