Evaluating climatic and non-climatic influences on ion chemistry in natural and man-made lakes of Nebraska,USA |
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Authors: | D M Bennett S C Fritz J C Holz A A Holz V A Zlotnik |
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Institution: | (1) Department of Geosciences, University of Nebraska, Lincoln, NE 68588-0340, USA;(2) School of Natural Resources, University of Nebraska, Lincoln, NE 68583-0814, USA |
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Abstract: | Conductivity and major ion chemistry data were analyzed for a suite of Nebraska (USA) natural lakes, reservoirs, sand pits,
and barrow pits to evaluate the magnitude of climatic versus non-climatic influence on ionic concentration and composition.
In both natural lakes and sand and barrow pits, conductivity is positively related to longitude and reflects decreasing effective
moisture from east to west. Reservoirs showed no relationship between lake conductivity and location, probably because the
reservoirs are very strongly influenced by groundwater and surface water inflow and have shorter residence times relative
to the other lake types. At smaller spatial scales, conductivity among natural lakes is variable. Lakes that are at low elevation
within a groundwater flow system were fresh, because of substantial input of fresh groundwater. In contrast, lakes at high
elevation exhibited a wide range of conductivity, probably because of differences in the degree of connection to groundwater
and surface to volume ratio impacts on evaporation rates. Differences also were evident among natural lakes in terms of their
response to seasonal changes in precipitation. Sub-saline and saline lakes showed more seasonal variation in conductivity
than freshwater lakes, and lakes in the more arid part of the state showed larger responses to precipitation change than those
in areas to the east that receive higher precipitation. |
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Keywords: | Limnology Climate Conductivity Saline lakes Reservoirs |
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