A calibration between Chaac d18o and the instrument record of precipitation from a meteorological station in Merida indicates a significant correlation between the two signals

depth of sample from the top of stalagmite

Buhay, W.M.; Simpson, S.; Thorleifson, H.; Lewis, M.; King, J.; Telka, A.; Wilkinson, P.; Babb, J.; Timsic, S.; Bailey, D.

Manitoba Hydro; Geological Survey of Canada

Buhay, William Mark and Simpson, Shawna and Thorleifson, Harvey and Lewis, Mike and King, John and Telka, Alice and Wilkinson, Paul and Babb, Jeff and Timsic, Sandra and Bailey, Dan

A 1000-year record of dry conditions in the eastern Canadian prairies reconstructed from oxygen and carbon isotope measurements on Lake Winnipeg sediment organics

carbon isotopes from sediment organic matter

organic matter sediment samples sieved at 500 um

Yellow Lake, Colorado Holocene Calcite Oxygen Isotope Data

Rocky Mountain hydroclimate: Holocene variability and the role of insolation, ENSO, and the North American Monsoon

Kennett, D.J.; Breitenbach, S.F.M.; Aquino, V.V.; Asmerom, Y.; Awe, J.; Baldini, J.U.L.; Bartlein, P.; Culleton, B.J.; Ebert, C.; Jazwa, C.; Macri, M.J.; Marwan, N.; Polyak, V.; Prufer, K.M.; Ridley, H.E.; Sodemann, H.; Winterhalder, B.; Haug, G.H.

Yok Balum Cave, Belize 2000 Year Stalagmite Stable Isotope Data

The role of climate change in the development and demise of Classic Maya civilization (300 to 1000 C.E.) remains controversial because of the absence of well-dated climate and archaeological sequences. We present a precisely dated subannual climate record for the past 2000 years from Yok Balum Cave, Belize. From comparison of this record with historical events compiled from well-dated stone monuments, we propose that anomalously high rainfall favored unprecedented population expansion and the proliferation of political centers between 440 and 660 C.E. This was followed by a drying trend between 660 and 1000 C.E. that triggered the balkanization of polities, increased warfare, and the asynchronous disintegration of polities, followed by population collapse in the context of an extended drought between 1020 and 1100 C.E.