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Research Interests:
My general research area is paleoceanography. Within this broader field,
I employ isotopic and organic geochemical techniques to the questions of sea surface temperature
and global circulation change. I have maintained a long-term focus on improving paleo-sea surface
temperature (SST) estimates using biomarkers, in conjunction with foraminiferally based estimates.
My studies on deep water ventilation, employing isotopic tools (primarily radiocarbon) are
elucidating Southern Ocean influence on carbon cycling during climate driven circulation
changes in the past. These concordant studies investigate the interplay between ocean circulation
and glacial/interglacial regimes.
The unifying theme in my work is carbon cycling. These paleoclimate studies are complimented by
work on sediment trap and coastal studies investigating sources, pathways, and sinks of both terrestrial
and marine carbon in modern environments. Presently I am implementing work to further integrate my
biomarker and isotopic studies by employing compound-specific stable and radiocarbon isotopic studies
to improve the assessment of carbon partitioning (marine, terrestrial, organic inorganic) and the
influences of climate change on carbon pathways over multi-million, millennial, and decadal time scales.
Research Lab:
Paleoceanography and organic geochemistry |
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Web log from
the Research Vessel Roger Revelle in the Southwest Pacific Ocean |
