A latest Pleistocene and Holocene glacial history and paleoclimate reconstruction at Three Sisters and Broken Top Volcanoes, Oregon, U.S.A.

2008/12/03 by Shaun A. Marcott, Andrew G. Fountain, Jim E. O’Connor +2 · 1 citation
Earth and Planetary Sciences · #Geology and Paleoclimatology Research #Tree-ring climate responses #Cryospheric studies and observations #Geology #Moraine #Last Glacial Maximum #Glacier #Glacial period #Pleistocene #Holocene #Paleoclimatology #Snow #Climatology #Physical geography #Younger Dryas #Climate change #Paleontology #Oceanography #Geomorphology #Geography

paper · doi:10.1016/j.yqres.2008.09.002

openalex publication_date 2008/12/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/21

Abstract

Abstract At least three sets of moraines mark distinct glacial stands since the last glacial maximum (LGM) in the Three Sisters region of the Oregon Cascade Range. The oldest stand predates 8.1 ka (defined here as post-LGM), followed by a second between ∼ 2 and 8 ka (Neoglacial) and a third from the Little Ice Age (LIA) advance of the last 300 years. The post-LGM equilibrium line altitudes were 260 ± 100 m lower than that of modern glaciers, requiring 23 ± 9% increased winter snowfall and 1.4 ± 0.5°C cooler summer temperatures than at present. The LIA advance had equilibrium line altitudes 110 ± 40 m lower than at present, implying 10 ± 4% greater winter snowfall and 0.6 ± 0.2°C cooler summer temperatures.

Citations

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Cited by

• Broken Top [wikipedia]

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