Lake Braya Sø, Greenland 7,000 Year Temperature Reconstructions von Gunten, L.; D'Andrea, W.J.; Bradley, R.S.; Huang, Y. von Gunten, L. D'Andrea, W.J. Bradley, R.S. Huang, Y. Air Temperature Reconstruction earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,alkenone unsaturation index,unspecified error upper bound,degree Celsius,null,climate reconstructions|paleolimnology,null,null,N,based on Uk37 and VIS-RS) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,alkenone unsaturation index,unspecified error lower bound,degree Celsius,null,climate reconstructions|paleolimnology,null,null,N,based on Uk37 and VIS-RS) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleolimnology,filtered|interpolated,null,N,based on Uk37 and VIS-RS; linearly interpolated to annual time steps; band-pass filtered 50-70 years) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleolimnology,null,null,N,based on Uk37 and VIS-RS) earth science/paleoclimate/paleolimnology (Lake Braya Sø>LATITUDE 69.9875>LONGITUDE -51.0333) High-resolution paleoclimate reconstructions are often restricted by the difficulties of sampling geologic archives in great detail and the analytical costs of processing large numbers of samples. Using sediments from Lake Braya Sø, Greenland, we introduce a new method that provides a quantitative high-resolution paleoclimate record by combining measurements of the alkenone unsaturation index (UK37) with non-destructive scanning reflectance spectroscopic measurements in the visible range (VIS-RS). The proxy-to-proxy (PTP) method exploits two distinct calibrations: the in situ calibration of UK37 to lake water temperature and the calibration of scanning VIS-RS data to down core UK37 data. Using this approach, we produced a quantitative temperature record that is longer and has 5 times higher sampling resolution than the original UK37 time series, thereby allowing detection of temperature variability in frequency bands characteristic of the AMO over the past 7,000 years. STUDY NOTES: High-resolution temperature reconstructions based on alkenone data and scanning reflectance spectroscopy measurements from sediments collected in Lake Braya Sø, West Greenland. Free lipids were extracted from core BS01-01, freeze-dried and homogenized. Alkenone samples at 0.5 cm intervals were quantified by gas-chromatography-flame-ionization-detection. The VIS-RS measurements were conducted on an overlapping core (BS03-01) at 2mm intervals. Relative Absorption Band Depth at 660-760 nm was utilized for the reconstructions. Lake Braya Sø, West Greenland: 66°59'15"N, 51°02'0"W, 170m elev, 24m depth NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : von Gunten, L. Investigator : D'Andrea, W.J. Investigator : Bradley, R.S. Investigator : Huang, Y. 2012-08-29 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13218 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/braya-so2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/braya-so2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/braya-so2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/braya-so2012.xls English https://www.ncdc.noaa.gov/paleo/study/13218 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/braya-so2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/braya-so2012.xls von Gunten, L., W.J. D'Andrea, R.S. Bradley, and Y. Huang. 2012. Proxy-to-proxy calibration: Increasing the temporal resolution of quantitative climate reconstructions. Scientific Reports 2, Article number 609, 29 August 2012. doi:10.1038/srep00609 START YEAR: -4999 AD * END YEAR: 2005 AD -51.0333 69.9875 -51.0333 69.9875