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

摘要: 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 the eastern Sierra Nevada region since 155,000 yr B.P. To first order, records match well marine δ18O record. At Lake, however, last interglaciation appears to span entire period 120,000 50,000 B.P., according our chronology, was punctuated by numerous short periods of wetter conditions during an otherwise dry climate. proxies reveal that apparent timing glacial–interglacial transitions, notably penultimate one, is proxy-dependent. In grain-size carbonate-content this transition abrupt occurs at ∼120,000 contrast, isotopic gradual between 145,000 Differences are attributed variable responses change.