Farewell Lake, Alaska 2000 Year d18O and Temperature Reconstructions Hu, F.S.; Ito, E.; Brown, T.A.; Curry, B.B.; Engstrom, D.R. Hu, F.S. Ito, E. Brown, T.A. Curry, B.B. Engstrom, D.R. Air Temperature Reconstruction Medieval Warm Period earth science/paleoclimate/paleolimnology (delta 18O,carbonate,null,per mil VPDB,null,paleolimnology,averaged,isotope ratio mass spectrometry,N,3 point average) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,delta 18O,null,degree Celsius,null,climate reconstructions|paleolimnology,anomalized|smoothed,null,N,3 point average; Paired oxygen-isotopic analyses of abiotic carbonate and benthic ostracodes) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,averaged,isotope ratio mass spectrometry,N,3 point average; Candona ikpikpukensis) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,delta 18O,null,degree Celsius,null,climate reconstructions|paleolimnology,anomalized,null,N,growing season; Paired oxygen-isotopic analyses of abiotic carbonate and benthic ostracodes) 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 13C,ostracod,null,per mil VPDB,null,paleolimnology,averaged,isotope ratio mass spectrometry,N,3 point average; Candona ikpikpukensis) earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,Candona ikpikpukensis) earth science/paleoclimate/paleolimnology (delta 13C,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 13C,carbonate,null,per mil VPDB,null,paleolimnology,averaged,isotope ratio mass spectrometry,N,3 point average) earth science/paleoclimate/paleolimnology (delta 13C,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,Candona ikpikpukensis) earth science/paleoclimate/paleolimnology (delta 18O,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Farewell Lake>LATITUDE 62.55>LONGITUDE -153.6333) Paired oxygen-isotopic analyses of abiotic carbonate and benthic ostracode shells from lake sediments provide a continuous quantitative record of growing-season temperature for the past 2000 years in the northwestern foothills of the Alaska Range. This record reveals three time intervals of comparable warmth: anno Domini (A.D.) 0-300, 850-1200, and post-1800, the latter two of which correspond to the Medieval Climatic Anomaly and climatic amelioration after the end of the Little Ice Age. The Little Ice Age culminated at A.D. 1700, when the climate was -1.7°C colder than at present. A marked climatic cooling also occurred around A.D. 600, coinciding with extensive glacial advances in Alaska. Comparisons of this temperature record with ostracode trace-element ratios (Mg/Ca, Sr/Ca) further suggest that colder periods were wetter and vice versa during the past 2000 years. STUDY NOTES: Paired oxygen isotope data from abiotic carbonate and benthic ostracode shells and reconstructed growing season temperature for the past 2000 years from Farewell Lake, in the northwestern foothills of the Alaska Range. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Hu, F.S. Investigator : Ito, E. Investigator : Brown, T.A. Investigator : Curry, B.B. Investigator : Engstrom, D.R. 2010-03-26 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10455 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/farewell2001.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/farewell2001.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/farewell2001.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/farewell2001.xls English https://www.ncdc.noaa.gov/paleo/study/10455 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/farewell2001.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/farewell2001.xls Hu, F.S., E. Ito, T.A. Brown, B.B. Curry, and D.R. Engstrom. 2001. Pronounced Climatic Variations in Alaska during the Last Two Millennia. Proceedings of the National Academy of Sciences, Vol. 98, No. 19, pp. 10552-10556, Sep. 11, 2001. DOI: 10.1073/pnas.181333798 START YEAR: -45 AD * END YEAR: 1962 AD -153.6333 62.55 -153.6333 62.55