Pacific Northwest 1500yr Lake d18O Data and Precipitation Reconstruction Steinman, B.; Abbott, M.B.; Mann, M.E.; Stansell, N.D.; Finney, B.P. Steinman, B. Abbott, M.B. Mann, M.E. Stansell, N.D. Finney, B.P. ENSO Pacific Decadal Oscillation Precipitation Reconstruction earth science/paleoclimate/paleolimnology (delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,null,null,N,Castor Lake) earth science/paleoclimate/paleolimnology (delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,null,null,N,Renner Lake) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation,delta 18O,95% confidence interval lower bound,millimeter,Nov-Feb,climate reconstructions|paleolimnology,averaged,numerical simulation,N,20-year average; physical model of lake sediment d18O) earth science/paleoclimate/paleolimnology (delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,null,null,N,Castor-Lime) earth science/paleoclimate/paleolimnology (delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,null,null,N,Renner-Lime) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,calendar year before present,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,anomalized,null,N,Lime Lake) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation,delta 18O,null,millimeter,Nov-Feb,climate reconstructions|paleolimnology,averaged,numerical simulation,N,20-year average; physical model of lake sediment d18O) earth science/paleoclimate/climate reconstructions|paleolimnology (precipitation,delta 18O,95% confidence interval upper bound,millimeter,Nov-Feb,climate reconstructions|paleolimnology,averaged,numerical simulation,N,20-year average; physical model of lake sediment d18O) earth science/paleoclimate/paleolimnology (delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,anomalized,null,N,Renner Lake) earth science/paleoclimate/paleolimnology (delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,anomalized,null,N,Castor Lake) earth science/paleoclimate/paleolimnology (delta 18O,calcium carbonate,null,per mil VPDB,null,paleolimnology,null,null,N,Lime Lake) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Lime Lake>LATITUDE 48.87>LONGITUDE -117.34) (Castor Lake>LATITUDE 48.54>LONGITUDE -119.56) (Renner Lake>LATITUDE 48.78>LONGITUDE -118.19) 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 Niño 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 complete understanding of the climate system and likely explain disparities in inferred climate trends over centennial timescales. STUDY NOTES: Delta d180 data and 1500 year November-February precipitation reconstruction from Castor Lake and Lime Lake, eastern Washington, USA, for the last 1500 years. Castor and Lime Lakes are located east of the Cascade Range, in a relatively dry, PDO/ENSO sensitive region. Results indicate that November-February rain/snowfall is the strongest control on Castor Lake sediment d18O values and modeled Dd18O values. Castor Lake: 48.54°N, 119.56°W, elevation 594 m, ~12m depth Lime Lake: 48.87°N, 117.34°W, elevation 780 m, ~15m depth Renner Lake: 48.78°N, 118.19°W, elevation 754 m NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Steinman, B. Investigator : Abbott, M.B. Investigator : Mann, M.E. Investigator : Stansell, N.D. Investigator : Finney, B.P. 2012-07-29 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13174 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/washington/castor-lime2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/washington/castor-lime2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/washington/castor-lime2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/washington/castor-lime2012.xls English https://www.ncdc.noaa.gov/paleo/study/13174 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/washington/castor-lime2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/washington/castor-lime2012.xls Steinman, B.A., M.B. Abbott, M.E. Mann, N.D. Stansell, and B.P. Finney. 2012. 1,500 year quantitative reconstruction of winter precipitation in the Pacific Northwest. Proceedings of the National Academy of Sciences, July 17, 2012 Vol. 109, no. 29, pp. 11619-11623. Published online before print July 2, 2012, doi: 10.1073/pnas.1201083109 START YEAR: 1450 cal yr BP * END YEAR: -50 cal yr BP -119.56 48.54 -117.34 48.87