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Geology; December 2002; v. 30; no. 12; p. 1103-1106; DOI: 10.1130/0091-7613(2002)030<1103:HIROPA>2.0.CO;2
© 2002 Geological Society of America
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Hydrogen isotope ratios of palmitic acid in lacustrine sediments record late Quaternary climate variations

Yongsong Huang1, Bryan Shuman1, Yi Wang1 and Thompson Webb, III1

1 Department of Geological Sciences, Brown University, Providence, Rhode Island 02912, USA

The rich paleoclimate information preserved in lacustrine sedimentary organic matter can be difficult to extract because of the mixed terrestrial and aquatic inputs. Herein we demonstrate that compound-specific hydrogen isotope analysis of palmitic acid, (PA), a ubiquitous compound in lacustrine sediments, captures the {delta}D signals of lake water. Samples collected across a diverse range of 33 North American lakes show a strong correlation between water and {delta}DPA values. At Crooked Pond, Massachusetts, the {delta}DPA changes in a 14 k.y. sediment record parallel temperature trends inferred from fossil pollen. Downcore changes reveal differences between climatic trends in New England and in Greenland that are consistent with important regional differences in climate controls.

Key Words: palmitic acid • hydrogen isotope ratios • lake sediments • paleoclimate




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