Current Research ProjectS:

Antarctic ice-sheet initiation at the Eocene-Oligocene boundary, and subsequent ice and sediment evolution in the Cenozoic, using coupled GCM-regional climate-ice sheet-sediment models (with Robert DeConto, U. Massachusetts, and ACE [Antarctic Climate Evolution] and ANDRILL [ANTarctic geological DRILLing] projects)

Development of combined ice sheet, ice shelf and sub-glacial sediment models, and applications to past and future vulnerable sectors of Antarctica and Greenland (with CReSIS Science and Technology Center, U. Kansas and PSU)

Coupling of global climate, ice sheet and geochemical models capable of several-million-year long simulations to investigate intrinsically time-continuous transitions in Earth history (with Lee Kump, PSU)

Warm Cretaceous climates, O¹⁸/O¹⁶ precipitation and sea-water distributions, using coupled atmospheric and ocean GCMs with isotopic capability (with Timothy White, PSU, and Christopher Poulsen, U. Michigan)

Using past GCM climates as an input to geochemical models of soil weathering over long time periods (with Jennifer Williams and Susan Brantley, PSU, and Yves Godderis, LMTG, France)

GCM modeling of climates of Earth-like planets tidally locked around M-type stars (with Adam Edson and James Kasting, PSU)

Recent Research ProjectS:

Conditions for collapse to Snowball Earth in the Neoproterozoic, and the viability of thin-ice Snowball conditions, using GCM-ice sheet models, and an EBM with sea glacier flow (with James Kasting, PSU)

Climates before and during the Permo-Carboniferous glaciation, and relationships to O¹⁸/O¹⁶ data, using GCM and 3-D ice sheet models (with Ethan Grossman and William Hyde, Texas A&M)

Climate connections with the demise of the Neanderthals, using the RegCM regional climate model over Europe around 30,000 years BP (with Eric Barron, PSU, and the international Stage 3 Project)

Modeling the Quaternary Ice Ages, sediment fluxes and ⁸⁷Sr/⁸⁶Sr budgets, with coupled GCM-ice sheet models (with Peter Clark and Steven Hostetler, Oregon State Univ.)

Coupling of a fine-grid continental-scale hydrology model with coarse-grid climate models, over modern North America (with Zhongbo Yu, U. Nevada Las Vegas)

Future anthropogenic climate change over North America and East Asia, using the RegCM and MM5 regional climate models (with Ming Chen, U. New Hampshire)

Extraordinary climates with extreme orbits, using GCM simulations with present Earth surface conditions (with Darren Williams, PSU-Erie)

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