Exploratory Analysis of the Winter Chemistry of Five Lakes on the North Slope of Alaska
Identifieur interne : 000699 ( Main/Exploration ); précédent : 000698; suivant : 000700Exploratory Analysis of the Winter Chemistry of Five Lakes on the North Slope of Alaska
Auteurs : Molly K. Chambers [États-Unis] ; Daniel M. White [États-Unis] ; Michael R. Lilly [États-Unis] ; Larry D. Hinzman [États-Unis] ; Kristie M. Hilton [États-Unis] ; Robert C. Busey [États-Unis]Source :
- JAWRA Journal of the American Water Resources Association [ 1093-474X ] ; 2008-04.
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- topic : Arctique.
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Abstract
Abstract: Lakes are important water resources on the North Slope of Alaska. Freshwater is required for oilfield production as well as exploration, which occurs largely on ice roads and pads. Since most North Slope lakes are shallow, the quantity and quality of the water under ice at the end of winter are important environmental management issues. Currently, water‐use permits are a function of the presence of overwintering fish populations, and their sensitivity to low oxygen concentrations. Sampling of five North Slope lakes during the winter of 2004‐2005 shed some light on the winter chemistry of four lakes that were used as water supplies and one undisturbed lake. Field analysis was conducted for oxygen, conductivity, pH, and temperature throughout the lake depth, as well as ice thickness and water depth. Water samples were retrieved from the lakes and analyzed for Na, Ca, K, Mg, Fe, dissolved‐organic carbon, and alkalinity in the laboratory. Lake properties, rather than pumping, were the best predictors of oxygen depletion, with the highest dissolved‐oxygen levels maintained in the lake with the lowest concentration of constituents. Volume weighted mean dissolved‐oxygen concentrations ranged from 4 to 94% of saturation in March. Dissolved oxygen and specific conductance data suggested that the lakes began to refresh in May.
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DOI: 10.1111/j.1752-1688.2007.00164.x
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Freshwater is required for oilfield production as well as exploration, which occurs largely on ice roads and pads. Since most North Slope lakes are shallow, the quantity and quality of the water under ice at the end of winter are important environmental management issues. Currently, water‐use permits are a function of the presence of overwintering fish populations, and their sensitivity to low oxygen concentrations. Sampling of five North Slope lakes during the winter of 2004‐2005 shed some light on the winter chemistry of four lakes that were used as water supplies and one undisturbed lake. Field analysis was conducted for oxygen, conductivity, pH, and temperature throughout the lake depth, as well as ice thickness and water depth. Water samples were retrieved from the lakes and analyzed for Na, Ca, K, Mg, Fe, dissolved‐organic carbon, and alkalinity in the laboratory. Lake properties, rather than pumping, were the best predictors of oxygen depletion, with the highest dissolved‐oxygen levels maintained in the lake with the lowest concentration of constituents. Volume weighted mean dissolved‐oxygen concentrations ranged from 4 to 94% of saturation in March. Dissolved oxygen and specific conductance data suggested that the lakes began to refresh in May.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Alaska</li></region></list><tree><country name="États-Unis"><region name="Alaska"><name sortKey="Chambers, Molly K" sort="Chambers, Molly K" uniqKey="Chambers M" first="Molly K." last="Chambers">Molly K. Chambers</name></region><name sortKey="Busey, Robert C" sort="Busey, Robert C" uniqKey="Busey R" first="Robert C." last="Busey">Robert C. Busey</name><name sortKey="Hilton, Kristie M" sort="Hilton, Kristie M" uniqKey="Hilton K" first="Kristie M." last="Hilton">Kristie M. Hilton</name><name sortKey="Hinzman, Larry D" sort="Hinzman, Larry D" uniqKey="Hinzman L" first="Larry D." last="Hinzman">Larry D. Hinzman</name><name sortKey="Lilly, Michael R" sort="Lilly, Michael R" uniqKey="Lilly M" first="Michael R." last="Lilly">Michael R. Lilly</name><name sortKey="White, Daniel M" sort="White, Daniel M" uniqKey="White D" first="Daniel M." last="White">Daniel M. White</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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