Laguna Pumacocha, Peru, 2300 Year Stable Isotope Data Bird, B.W.; Abbott, M.B.; Vuille, M.; Rodbell, D.; Stansell, N.D.; Rosenmeier, M.F. Bird, B.W. Abbott, M.B. Vuille, M. Rodbell, D. Stansell, N.D. Rosenmeier, M.F. Monsoon PAGES 2k Network PAGES LOTRED SA2k earth science/paleoclimate/instrumental (collection date,null,null,null,null,instrumental,null,null,C,null) earth science/paleoclimate/paleolimnology (delta 18O,calcite,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,sediment trap data) earth science/paleoclimate/instrumental (delta 18O,lake water,null,per mil VSMOW,null,instrumental,null,isotope ratio mass spectrometry,N,surface water) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/instrumental (collection water depth,null,null,meter,null,instrumental,null,null,N,null) earth science/paleoclimate/instrumental (alkalinity,lake water,null,milligram per liter,null,instrumental,null,null,N,null) earth science/paleoclimate/paleolimnology (collection water depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (age,null,null,year Common Era,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 13C,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (delta 13C,calcite,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,sediment trap data) earth science/paleoclimate/instrumental (delta 2H,lake water,null,per mil VSMOW,null,instrumental,null,isotope ratio mass spectrometry,N,surface water) earth science/paleoclimate/paleolimnology (collection date,null,null,null,null,paleolimnology,null,null,C,null) 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 (Laguna Pumacocha>LATITUDE -10.7002>LONGITUDE -76.0605) Decadal and centennial mean state changes in South American summer monsoon (SASM) precipitation during the last 2,300 years are detailed using an annually resolved authigenic calcite record of precipitation d18O from a varved lake in the Central Peruvian Andes. This unique sediment record shows that d18O peaked during the Medieval Climate Anomaly (MCA) from A.D. 900 to 1100, providing evidence that the SASM weakened considerably during this period. Minimum d18O values occurred during the Little Ice Age (LIA) between A.D. 1400 and 1820, reflecting a prolonged intensification of the SASM that was regionally synchronous. After the LIA, d18O increased rapidly, particularly during the current warm period (CWP; A.D. 1900 to present), indicating a return to reduced SASM precipitation that was more abrupt and sustained than the onset of the MCA. Diminished SASM precipitation during the MCA and CWP tracks reconstructed Northern Hemisphere and North Atlantic warming and a northward displacement of the Intertropical Convergence Zone (ITCZ) over the Atlantic, and likely the Pacific. Intensified SASM precipitation during the LIA follows reconstructed Northern Hemisphere and North Atlantic cooling, El Niño-like warming in the Pacific, and a southward displacement of the ITCZ over both oceans. These results suggest that SASM mean state changes are sensitive to ITCZ variability as mediated by Western Hemisphere tropical sea surface temperatures, particularly in the Atlantic. Continued Northern Hemisphere and North Atlantic warming may therefore help perpetuate the recent reductions in SASM precipitation that characterize the last 100 years, which would negatively impact Andean water resources. STUDY NOTES: Sediment stable isotope and limnological data from Laguna Pumacocha, Peru, spanning the last 2300 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Bird, B.W. Investigator : Abbott, M.B. Investigator : Vuille, M. Investigator : Rodbell, D. Investigator : Stansell, N.D. Investigator : Rosenmeier, M.F. 2011-05-21 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/11174 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/peru/pumacocha2011.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/peru/pumacocha2011.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/peru/pumacocha2011.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/peru/pumacocha2011.txt English https://www.ncdc.noaa.gov/paleo/study/11174 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/peru/pumacocha2011.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/peru/pumacocha2011.txt Bird, B.W., M.B. Abbott, M. Vuille, D.T. Rodbell, N.D. Stansell, and M.F. Rosenmeier. 2011. A 2,300-year-long annually resolved record of the South American summer monsoon from the Peruvian Andes. Proceedings of the National Academy of Sciences, Vol. 108 (21), pp. 8583-8588, May 24, 2011. doi:10.1073/pnas.1003719108 START YEAR: -277 AD * END YEAR: 2007 AD -76.0605 -10.7002 -76.0605 -10.7002