Early Eocene latitudinal isotope gradients in precipitation and implications for global latent heat transport: new data from British Columbia, Canada and a global data-model comparison (original) (raw)

Abstract

The Early Eocene Climatic Optimum (EECO), occurring roughly 52 million years ago, represents an Earth system response to elevated atmospheric CO2 levels and potentially serves as an analog for the Earth system response to anthropogenic CO2 emissions over the next several centuries. During EECO, global temperatures were 12-15 ºC warmer than modern, with the majority of warming occurring at high latitudes, effectively reducing the Earth’s latitudinal temperature gradient. Despite a wealth of studies, there remain discrepancies between proxy records and global climate models as to the magnitude of this reduction in temperature gradients. In particular, proxy records of isotopes in precipitation appear to indicate shallower temperature gradients than models are able to simulate; however, many of these studies utilize empirical relationships between precipitation isotopes and temperature gradients that likely do not hold under different climate regimes. Here we present 5 new proxy record...

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