Lake Silvaplana, Switzerland 400 Year Annual Biogenic Silica and Temperature Reconstruction Blass, A.; Bigler, C.; Grosjean, M.; Sturm, M. Blass, A. Bigler, C. Grosjean, M. Sturm, M. Air Temperature Reconstruction earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,milligram per square centimeter per year,null,paleolimnology,null,null,N,Biogenic silica flux) earth science/paleoclimate/climate reconstructions|paleolimnology (surface air temperature,null,null,degree Celsius,annual,climate reconstructions|paleolimnology,averaged,null,N,9 year running mean; based on biogenic silica) 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 (surface air temperature,null,null,degree Celsius,Sep-Nov,climate reconstructions|paleolimnology,averaged,null,N,9 year running mean; based on biogenic silica) earth science/paleoclimate/climate reconstructions|paleolimnology (surface air temperature,null,two standard error,degree Celsius,Sep-Nov,climate reconstructions|paleolimnology,averaged,null,N,based on biogenic silica) earth science/paleoclimate/climate reconstructions|paleolimnology (surface air temperature,null,two standard error,degree Celsius,annual,climate reconstructions|paleolimnology,averaged,null,N,based on biogenic silica) earth science/paleoclimate/paleolimnology (Lake Silvaplana>LATITUDE 46.45>LONGITUDE 9.8) A quantitative high-resolution autumn (SeptemberŋNovember) temperature reconstruction for the southeastern Swiss Alps back to AD 1580 is presented here. We used the annually resolved biogenic silica (diatoms) flux derived from the accurately dated and annually sampled sediments ofLake Silvaplana (46°27'N, 9°48'E, 1800 m a.s.l.). The biogenic silica flux smoothed by means of a 9-yr running mean was calibrated (r=0.70, pb0.01) against local instrumental temperature data (AD 1864ŋ1949). The resulting reconstruction (ą2 standard errors=ą0.7°C) indicates that autumns during the late Little Ice Age were generally cooler than they were during the 20th century. During the cold anomaly around AD 1600 and during the Maunder Minimum, however, the reconstructed autumn temperatures did not experience strong negative departures from the 20th century mean. The warmest autumns prior to 1900 occurred around AD 1770 and 1820 (0.75 °C above the 20th-century mean). Our data agree closely with two other autumn temperature reconstructions for the Alps and for Europe that are based on documentary evidence and are completely unrelated to our data, revealing a very consistent picture over the centuries. STUDY NOTES: Annually resolved biogenic silica (diatoms) flux data and temperature reconstruction from Lake Silvaplana, Swiss Alps. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Blass, A. Investigator : Bigler, C. Investigator : Grosjean, M. Investigator : Sturm, M. 2007-10-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6059 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2007.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2007.txt English https://www.ncdc.noaa.gov/paleo/study/6059 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2007.txt Blass, A.,Bigler, C.,Grosjean, M.,Sturm, M. 2007. Decadal-scale autumn temperature reconstruction back to AD 1580 inferred from the varved sediments of Lake Silvaplana (southeastern Swiss Alps). Quaternary Research, 68, 184-195. START YEAR: 373 cal yr BP * END YEAR: 1 cal yr BP 9.8 46.45 9.8 46.45