Dr Caitlyn Witkowski

Postdoctoral Research Associate

Background

I graduated with Honors from Bryant University in Rhode Island, USA in 2007 with a double major in Environmental Science and Global Studies with a minor in Business Administration. I worked as a research assistant with Prof. Hong Yang and Dr. Qin Leng time on a NASA Rhode Island Space Grant, developing tools to understand the role of labile biomolecules, both from an organic geochemical and paleobotanical perspective. I learned organic geochemical techniques from Mark Pagani’s group at Yale University and analytical instrumentation from Roger Summon’s group at MIT.

My Masters in Global Environmental Studies was also completed at Bryant University with Prof. Hong Yang. The first year took place at the China University of Geosciences (Wuhan) where I conducted degradation experiments on Metasequoia leaves (Chinese dawn redwood) to better understand the effects of microbial degradation versus diagenesis on molecular preservation. Returning to the US, I worked as a research associate and then as laboratory manager for two years (NASA Rhode Island Space Grant). Other research during this time included origins of rice agriculture in China via biomarker fingerprinting and tracing the ancient silk road via stable isotope analysis and degradation studies.

My PhD project was completed at the Royal Netherlands Institute on Sea Research (NIOZ) and Utrecht University in the Netherlands, advised by Prof. Jaap Sinninghe Damsté, Prof. Stefan Schouten, and Dr. Marcel van der Meer. My research focus was to develop and apply a novel proxy for PCO2 reconstruction, where I tested the stable carbon isotopic fractionation associated with CO2-fixation via general algal biomarkers (compounds derived from many species) such as the diagenetic products of pigments, sterols, hopanoids, and highly branched isoprenoids. These studies were conducted in modern settings across transects from CO2 seeps and over the geologic record, including sapropel formations in the past 150 thousand years (Quaternary), in a Deep Sea Drilling Site off the coast of California over the past 16 million years (Neogene), and a compilation over the past 500 million years (Phanerozoic). 

I am currently a Postdoctoral Research Associate within the organic geochemistry unit (OGU) with Prof. Rich Pancost, Prof. Paul Valdes, and Dr. David Naafs on Biosphere Evolution, Transitions and Resilience (BETR) funding as part of the Understanding Monsoon and Biodiversity Relevant to Landscapes and Livelihoods in Asia (UMBRELLA) project.

 

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Research

My current research is to reconstruct Cenozoic climate change in China associated with Tibetan uplift and the biodiversification of terrestrial ecosystems.

The Himalaya/Tibet region provides more than 1.4 billion people with water and is a major biodiversity hotspot but is also one of the most sensitive to development, habitat-species loss, and climate change. Less than 25% of its natural habitat is intact and 163 native species are globally threatened. The aim of this project is to untangle the multiple tectonic and climatic controls that led to the modern monsoon system and that has led to and sustains the notably high biodiversity in the surrounding area, relying on strong UK-Chinese collaborations across a diverse team with climate modelling, palaeobotany, physical geology, and organic geochemistry approaches.

My role is to explore sedimentary archives in a transect from the Himalaya through mid-altitude Yunnan and sea-level southern China, with ages ranging from the Eocene through to the Pliocene (56-3 Ma). My primary focus is to reconstruct temperatures, as well as to trace changes to environmental regimes, altitude, and precipitation. This work, in combination with the information learned by the paleobotanical research, will be used to inform the models to ultimately better understand the evolution of this dynamic region, both geophysically and biologically, and understand the implications for the near future.

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Publications

 Further details of publications can be found in the University of Bristol publications system and Google Scholar

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