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Brendan Roark

My research interests focus primarily on understanding natural and anthropogenic climate variability over the last 50,000 years emphasizing biogeochemical cycling and paleoceanographic reconstructions in marine and estuarine environments. My specific research interests include:

• Seasonal, multi-decadal and centennial climate variability (e.g. ENSO, Pacific Decadal Oscillation) recorded in both surface and deep-sea corals.

• Centennial to millennial climate variability (e.g., Holocene climate variability, Younger Dryas cooling, Heinrich events, glacial-interglacial cycles) recorded in ocean sediment cores.

• High-resolution records capable of resolving the rapid and abrupt climate changes that occur on these different timescales.

• Policy and conservation issues related to coastal oceans (coral reefs in particular), fisheries, climate change, and anthropogenic effects.

My research employs a diverse analytical toolbox using environmentally sensitive isotopic (d13C, d18O and d15N) and trace element proxies (Sr, Mg, and Cd) to reconstruct environmental variables such as temperature, ocean circulation, salinity, river inflow, and nutrient utilization in different natural archives. I also employ a variety of geochronology methods (14C, U/Th, and skeletochronology) in order to develop high-resolution chronologies in marine archives. Finally, I run a well developed and diverse field program ranging from small boat coral drilling operations to blue water oceanography cruises with ROVs, submersibles, and AUVs as a critical part of my research program.

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