Lake Silvaplana, Switzerland 370 Year Minerals Data Trachsel, M.; Eggenberger, U.; Grosjean, M.; Blass, A.; Sturm, M. Trachsel, M. Eggenberger, U. Grosjean, M. Blass, A. Sturm, M. Little Ice Age (LIA) earth science/paleoclimate/paleolimnology (mineral index,sediment,null,dimensionless,null,paleolimnology,normalized,x-ray diffraction,N,mica/plagioclase) earth science/paleoclimate/paleolimnology (mineral index,sediment,null,dimensionless,null,paleolimnology,normalized,x-ray diffraction,N,quartz/amphibole) earth science/paleoclimate/paleolimnology (age,null,null,year Common Era,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (Lake Silvaplana>LATITUDE 46.45>LONGITUDE 9.8) We present quantitative autumn, summer and annual precipitation and summer temperature reconstructions from proglacial annually laminated Lake Silvaplana, eastern Swiss Alps back to AD 1580. We used X-ray diffraction peak intensity ratios of minerals in the sediment layers (quartz qz, plagioclase pl, amphibole am, mica mi) that are diagnostic for different source areas and hydrometeorological transport processes in the catchment. XRD data were calibrated with meteorological data (AD 1800/ 1864-1950) and revealed significant correlations: mi/pl with SON precipitation (r = 0.56, p < 0.05) and MJJAS precipitation (r = 0.66, p < 0.01); qz/mi with MJJAS temperature (r = -0.72, p < 0.01) and qz/am with annual precipitation (r = -0.54, p < 0.05). Geological catchment settings and hydro-meteorological processes provide deterministic explanations for the correlations. Our summer temperature reconstruction reproduces the typical features of past climate variability known from independent data sets. The precipitation reconstructions show a LIA climate moister than today. Exceptionally wet periods in our reconstruction coincide with regional glacier advances. STUDY NOTES: X-ray diffraction peak intensity ratios of minerals in the sediment layers (quartz qz, plagioclase pl, amphibole am, mica mi) of Lake Silvaplana, Switzerland. Lake Silvaplana, Switzerland: 46°27'N, 9°48'E, 1800m NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Trachsel, M. Investigator : Eggenberger, U. Investigator : Grosjean, M. Investigator : Blass, A. Investigator : Sturm, M. 2012-06-13 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13017 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2008b.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2008b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2008b.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2008b.txt English https://www.ncdc.noaa.gov/paleo/study/13017 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2008b.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/silvaplana2008b.txt Trachsel, M., U. Eggenberger, M. Grosjean, A. Blass, and M. Sturm. 2008. Mineralogy-based quantitative precipitation and temperature reconstructions from annually laminated lake sediments (Swiss Alps) since AD 1580. Geophysical Research Letters, Vol. 35, L13707, doi:10.1029/2008GL034121 START YEAR: 1581 AD * END YEAR: 1950 AD 9.8 46.45 9.8 46.45