Oceanography and Atmospheric Sciences and Meteorology Commons^™

Precipitation Rates And Atmospheric Heat Transport During The Cenomanian Greenhouse Warming In North America: Estimates From A Stable Isotope Mass-Balance Model, David F. Ufnar, Greg A. Ludvigson, Luis González, Darren R. Gröcke

Faculty Publications

Stable isotope mass-balance modeling results of meteoric δ¹⁸O values from the Cenomanian Stage of the Cretaceous Western Interior Basin (KWIB) suggest that precipitation and evaporation fluxes were greater than that of the present and significantly different from simulations of Albian KWIB paleohydrology. Sphaerosiderite meteoric δ¹⁸O values have been compiled from the Lower Tuscaloosa Formation of southwestern Mississippi (25°N paleolatitude), The Dakota Formation Rose Creek Pit, Fairbury Nebraska (35°N) and the Dunvegan Formation of eastern British Columbia (55°N paleolatitude). These paleosol siderite δ¹⁸O values define a paleolatitudinal gradient ranging from − 4.2‰ VPDB at 25°N …