How does rising atmospheric CO2 affect marine organisms?

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Lake Chichancanab, Mexico
Hodell, D.A., Brenner, M. and Curtis, J.H. 2005. Terminal Classic drought in the northern Maya lowlands inferred from multiple sediment cores in Lake Chichancanab (Mexico). Quaternary Science Reviews 24: 1413-1427.

Depth profiles of bulk density data were obtained by means of gamma-ray attenuation from sediment cores retrieved from Lake Chichanacanab in the center of the northern Yucatan Peninsula of Mexico (1950'-1957'N, 8845'-8846'W) and used as proxies for drought over the past several thousand years. These data revealed the existence of several massive droughts of unprecedented magnitude between AD 770 and 1100 that coincided with the demise of the Maya civilization, which we interpret to have occurred coincident with the MWP.