期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 29, 页码 11619-11623出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1201083109
关键词
lake modeling; oxygen isotopes; American West
资金
- Paleo Perspectives on Climate Change program of the National Science Foundation
- Atmospheric Sciences program of the National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1137750] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [0929182] Funding Source: National Science Foundation
Multiple paleoclimate proxies are required for robust assessment of past hydroclimatic conditions. Currently, estimates of drought variability over the past several thousand years are based largely on tree-ring records. We produced a 1,500-y record of winter precipitation in the Pacific Northwest using a physical model-based analysis of lake sediment oxygen isotope data. Our results indicate that during the Medieval Climate Anomaly (MCA) (900-1300 AD) the Pacific Northwest experienced exceptional wetness in winter and that during the Little Ice Age (LIA) (1450-1850 AD) conditions were drier, contrasting with hydroclimatic anomalies in the desert Southwest and consistent with climate dynamics related to the El Nino Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO). These findings are somewhat discordant with drought records from tree rings, suggesting that differences in seasonal sensitivity between the two proxies allow a more compete understanding of the climate system and likely explain disparities in inferred climate trends over centennial timescales.
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