Juxtlahuaca Cave, Mexico 2,250 Year d18O Data and Rainfall Reconstruction Lachniet, M.S.; Asmerom, Y.; Polyak, V.J.; Bernal, J.P. Lachniet, M.S. Asmerom, Y. Polyak, V.J. Bernal, J.P. Monsoon Precipitation Reconstruction earth science/paleoclimate/speleothems (depth,null,null,millimeter,null,speleothems,null,null,N,null) earth science/paleoclimate/climate reconstructions|speleothems (age,null,null,year Common Era,null,climate reconstructions|speleothems,null,null,N,U-series and tuned age model) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,standard deviation unit,null,speleothems,composited|normalized,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems (age,null,null,year Common Era,null,speleothems,null,null,N,JX-7 tuned U-series) earth science/paleoclimate/climate reconstructions|speleothems (precipitation,delta 18O,null,millimeter,May-Nov,climate reconstructions|speleothems,null,null,N,null) earth science/paleoclimate/speleothems (age,null,null,year Common Era,null,speleothems,null,null,N,tuned age model) earth science/paleoclimate/speleothems (age,null,null,year Common Era,null,speleothems,null,null,N,U-series age) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,standard deviation unit,null,speleothems,normalized,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,standard deviation unit,null,speleothems,filtered|normalized,isotope ratio mass spectrometry,N,45 year loess filter) earth science/paleoclimate/climate reconstructions|speleothems (age,null,null,year Common Era,null,climate reconstructions|speleothems,null,null,N,adjusted for 7yr epikarst lag) earth science/paleoclimate/speleothems (delta 18O,calcium carbonate,null,standard deviation unit,null,speleothems,composited|filtered|normalized,isotope ratio mass spectrometry,N,45 year loess filter) earth science/paleoclimate/speleothems (age,null,null,year Common Era,null,speleothems,null,null,N,adjusted for 7yr epikarst lag) earth science/paleoclimate/speleothems (age,null,null,year Common Era,null,speleothems,null,null,N,JX-6 tuned U-series) earth science/paleoclimate/speleothems (Juxtlahuaca Cave>LATITUDE 17.44>LONGITUDE -99.16) The drivers of Mesoamerican monsoon variability over the last two millennia remain poorly known because of a lack of precisely-dated and climate-calibrated proxy records. Here, we present a new high resolution (~2 yrs) and precisely-dated (+/- 4 yr) wet season hydroclimate reconstruction for the Mesoamerican sector of the North American Monsoon over the past 2250 years based on two aragonite stalagmites from southwestern Mexico which replicate oxygen isotope variations over the 950-1950 CE interval. The reconstruction is quantitatively calibrated to instrumental rainfall variations in the Basin of Mexico. Comparisons to proxy indices of ocean-atmosphere circulation show a synergistic forcing by the North Atlantic and El Nino/Southern Oscillations, whereby monsoon strengthening coincided with a La Nina-like mode and a negative North Atlantic Oscillation, and vice versa for droughts. Our data suggest that weak monsoon intervals are associated with a strong North Atlantic subtropical high pressure system and a weak Intertropical convergence zone in the eastern Pacific Ocean. Population expansions at three major highland Mexico civilization of Teotihuacan, Tula, and Aztec Tenochtitlan were all associated with drought to pluvial transitions, suggesting that urban population growth was favored by increasing freshwater availability in the semi-arid Mexican highlands, and that this hydroclimatic change was controlled by Pacific and Atlantic Ocean forcing. STUDY NOTES: Stalagmite oxygen isotope (d18O) data composite (JX chronology), plus Mesoamerican monsoon (May-November) precipitation reconstruction from Juxtlahuaca Cave, Mexico, for the past 2,250 years NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Lachniet, M.S. Investigator : Asmerom, Y. Investigator : Polyak, V.J. Investigator : Bernal, J.P. 2016-12-15 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/21019 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx6z.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx718o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jxchron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx7z.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx6z.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx718o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jxchron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx7z.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017.xlsx English https://www.ncdc.noaa.gov/paleo/study/21019 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx6z.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx718o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jxchron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017jx7z.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/mexico/juxtlahuaca2017.xlsx Matthew S. Lachniet, Yemane Asmerom, Victor Polyak, Juan Pablo Bernal2017Two millennia of Mesoamerican monsoon variability driven by Pacific and Atlantic synergistic forcingQuaternary Science Reviews155100-11310.1016/j.quascirev.2016.11.012http://www.sciencedirect.com/science/article/pii/S0277379116305352 START YEAR: -248 AD * END YEAR: 2009 AD -99.16 17.44 -99.16 17.44