Lachniet et al. 2004 Chilibrillo Cave, Panama Speleothem Stable Isotope Data Lachniet, M.S. Lachniet, M.S. earth science/paleoclimate/speleothems (depth,null,null,millimeter,null,speleothems,null,null,N,depth measured relative to bottom of core) earth science/paleoclimate/speleothems (age,null,null,calendar year before present,null,speleothems,null,null,N,null) 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 13C,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/speleothems earth science/paleoclimate/speleothems (Chilibrillo Cave>LATITUDE 9.2>LONGITUDE -79.7) The effect of the El Niņo/Southern Oscillation (ENSO) on tropical rainfall variations of the past two millennia is largely unknown. High-resolution monsoon records are sparse, despite the role of ENSO in generating global hydrologic anomalies in modern climate. To investigate the relationship between ENSO and the Central American Monsoon, we generated a high-resolution (~2.9 yr/sample) oxygen-isotope monsoon rainfall record from a U/Th-dated stalagmite (180 B.C. to 1310 A.D.) from the Isthmus of Panama. We present evidence for a weakened monsoon during the ""High Medieval"" (1100 - 1200 A.D.) and the Classic Maya Collapse (750 - 950 A.D.). Rainfall decreased and was more variable after 550 A.D., and the period 900 - 1310 A.D. was drier than the preceding millennium. A weaker monsoon corresponds with increased El Niņo variability, and our data display statistical variance in the ENSO band. We conclude that ENSO variation has forced isthmian rainfall and may have contributed to hemispheric climatic anomalies at this time. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Lachniet, M.S. 2004-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5430 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/panama/chilibrillo2004.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/panama/chilibrillo2004.txt English https://www.ncdc.noaa.gov/paleo/study/5430 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/northamerica/panama/chilibrillo2004.txt Lachniet, M.S. 2004. A 1500-year El Niņo/Southern Oscillation and rainfall history for the Isthmus of Panama from speleothem calcite. Journal of Geophysical Research, Atmospheres Vol. 109, D20117 START YEAR: -230 AD * END YEAR: 1260 AD -79.7 9.2 -79.7 9.2