A lack of well preserved paleoclimate indicators coupled with the abundance of gypsic soils in arid and semi-arid regions has stimulated research on using dO and dD isotopic analysis of the hydration water of gypsum to interpret paleoclimate. This study stresses the importance of establishing a pedogenic origin for gypsum crystals prior to isotopic analysis and evaluates the dominant processes ...

Pancontinental droughts in North America, or droughts that simultaneously affect a large percentage of the geographically and climatically distinct regions of the continent, present significant on-the-ground management challenges and, as such, are an important target for scientific research. The methodology of paleoclimate-model data comparisons is used herein to provide a more comprehensive un...

Radiatively active trace gases such as CO2, methane, nitrous oxide and chlorofluorocarbons warm the surface-troposphere system by iru~reasing the infrared opacity of the atmosphere. Climate models have been used to estiimate the warming associated with future increases in these gases. An important issue is the sensitivity, or the amount of climate response associated with a given amount of radi...

Professors McShane and Wyner have written a thought-provoking paper that intends to challenge some of the conventional wisdom in the paleoclimate literature. Rather than commenting on the merits of the entire methodology we focus on one topic. Namely, we discuss theoretical and practical aspects of the use of the least absolute shrinkage and selection operator [Tibshirani (1996)], more popularl...

Prevailing opinion assigns the Tibetan Plateau a crucial role in shaping Asian climate, primarily by heating of the atmosphere over Tibet during spring and summer. Accordingly, the growth of the plateau in geologic time should have written a signature on Asian paleoclimate. Recent work on Asian climate, however, challenges some (not all) of these views. The high Tibetan Plateau may affect the S...

Paleoclimate records are extremely rich sources of information about the past history of the Earth system. We take an informationtheoretic approach to analyzing data from the WAIS Divide ice core, the longest continuous and highest-resolution water isotope record yet recovered from Antarctica. We use weighted permutation entropy to calculate the Shannon entropy rate from these isotope measureme...

Abstract. The history of the long-term variations in astronomical elements used paleoclimate research shows that, contrary to what might be thought, Milutin Milankovitch is not father theory but he definitely modeling. He did calculate these himself them extensively for calculating “secular march” incoming solar radiation. advanced our understanding Quaternary climate by two important and origi...

ATMOSPHERIC AND OCEANIC INTERCONNECTIONS 9:00 Lehman, S. Abyssal Circulation and inter-hemispheric climate change 9:45 Brook, E. Interhemispheric correlation of ice core paleoclimate records using atmospheric gas records: methods and recent results