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The oxygen isotopic composition of seawater during the Last Glacial Maximum
Evolution of Ocean Temperature and Ice Volume Through the Mid-Pleistocene Climate Transition
The results suggest that the MPT was initiated by an abrupt increase in Antarctic ice volume 900 thousand years ago, and reveal the contributions of ice volume and temperature to glacial cycles, suggest when and why the Mid-Pleistocene Climate Transition occurred, and clarify how carbon is lost from the ocean-atmosphere during deglaciations but also changes because of ocean circulation.
Possible role of climate in the collapse of Classic Maya civilization
THE Maya civilization developed around 3,000 years ago in Mesoamerica, and after flourishing during the so-called Classic period, it collapsed around 750900 AD1. It has been specula ted26 that…
Rapid Acidification of the Ocean During the Paleocene-Eocene Thermal Maximum
Geochemical data from five new South Atlantic deep-sea sections indicate that a large mass of carbon dissolved in the ocean at the Paleocene-Eocene boundary and that permanent sequestration of this carbon occurred through silicate weathering feedback.
Solar Forcing of Drought Frequency in the Maya Lowlands
It is concluded that a significant component of century-scale variability in Yucatan droughts is explained by solar forcing, and some of the maxima in the 208-year drought cycle correspond with discontinuities in Maya cultural evolution, suggesting that the Maya were affected by these bicentennial oscillations in precipitation.
Climate Variability on the Yucatan Peninsula (Mexico) during the Past 3500 Years, and Implications for Maya Cultural Evolution
Climate variability on the Yucatan Peninsula during the past 3500 yrs is reconstructed from the measurement of δ18O in monospecific ostracods and gastropods in a 6.3-m sediment core from Lake Punta…
Terminal Classic drought in the northern Maya lowlands inferred from multiple sediment cores in Lake Chichancanab (Mexico)
Reconstruction of Caribbean climate change over the past 10,500 years
SEDIMENT cores from low-latitude lakes provide some of the best records of tropical climate change since the late Pleistocene. Here we report a high-resolution reconstruction of Caribbean climate…
Production, sedimentation, and isotopic composition of organic matter in Lake Ontario
Organic matter and its carbon and nitrogen isotopic composition were measured in sequential sediment trap and core samples from the Rochester Basin of Lake Ontario to evaluate their usefulness in…