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 programs)

 

·      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)

 

·      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)

 

·      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)

 

·      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)

 

 

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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