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Geology; March 2002; v. 30; no. 3; p. 215-218; DOI: 10.1130/0091-7613(2002)030<0215:CMTAOA>2.0.CO;2
© 2002 Geological Society of America
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Climate modulates the acidity of Arctic lakes on millennial time scales

Alexander P. Wolfe1

1 Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada

High-resolution diatom stratigraphies from two lakes on eastern Baffin Island (Nunavut, Canadian Arctic) are used to reconstruct lake-water pH over the past 5 k.y. Despite contrasting geomorphic histories and markedly different diatom floras, the inferred pH of both lakes declined in concert with Neoglacial cooling. This result confirms that climate exerts a first-order influence on the acidity of these poorly buffered oligotrophic lakes, through links between lake ice cover, primary productivity, and dissolved inorganic carbon dynamics. Diatom-based pH inferences from dilute lakes can therefore assist paleoclimatic interpretations from lake sediments.

Key Words: diatoms • lake acidity • Holocene • Neoglacial • Baffin Island




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