Climatic/Hydrologic Oscillations since 155,000 yr B.P. at Owens Lake, California, Reflected in Abundance and Stable Isotope Composition of Sediment Carbonate

• Published in: Quaternary research Vol. 48; no. 1; pp. 58 - 68
• Main Authors: Menking, Kirsten M., Bischoff, James L., Fitzpatrick, John A., Burdette, James W., Rye, Robert O.
• Format: Journal Article
• Language: English
• Published: New York, USA Cambridge University Press 01.07.1997; Elsevier Inc; Elsevier
• Subjects: America; Bgi / Prodig; Freshwater; Physical geography; United States of America; United States of America; California; USA, California, Owens L; Geochronology; Palaeogeography; Glacial features; Oxygen 18; Climatic variation; Isotope analysis; Carbonate; Lacustrine sediment; Grain size distribution; Interglacial; Pleistocene
• ISSN: 0033-5894; 1096-0287
• DOI: 10.1006/qres.1997.1898

Sediment grain size, carbonate content, and stable isotopes in 70-cm-long (∼1500-yr) channel samples from Owens Lake core OL-92 record many oscillations representing climate change in the eastern Sierra Nevada region since 155,000 yr B.P. To first order, the records match well the marine δ18O record. At Owens Lake, however, the last interglaciation appears to span the entire period from 120,000 to 50,000 yr B.P., according to our chronology, and was punctuated by numerous short periods of wetter conditions during an otherwise dry climate. Sediment proxies reveal that the apparent timing of glacial–interglacial transitions, notably the penultimate one, is proxy-dependent. In the grain-size and carbonate-content records this transition is abrupt and occurs at ∼120,000 yr B.P. In contrast, in the isotopic records the transition is gradual and occurs between 145,000 and 120,000 yr B.P. Differences in timing of the transition are attributed to variable responses by proxies to climate change.