Research Group

Postdocs

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Ana Arellano
My primary research interests involve the biogeochemical cycling of carbon in both marine and fresh water environments. I am particularly interested in understanding sources and transformations of colored dissolved organic matter (CDOM).

Currently, I am investigating wetland dissolved organic matter (DOM) or “blue carbon” loss from coastal wetlands to shelf waters in Barataria Bay and Apalachicola Bay. My project will enable a better understanding of carbon fluxes of wetland DOM exported to the coastal ocean using chemical biomarkers alongside CDOM’s optical properties, which are relatable to remote sensing observations. My work will help translate remotely sensed properties to geochemical information, and ultimately compute carbon fluxes from remote sensing algorithms.

I will also be exploring the formation of CDOM in the open ocean by tracking the evolution of CDOM’s chemical properties alongside its optical properties and comparing CDOM formed by phytoplankton culture experiments with field observations. My work will allow a better understanding of the source of open ocean CDOM.

I received my Ph.D. in Chemical Oceanography in 2013 from the University of South Florida, Florida, United States.


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Mathieu Le Meur

My research focuses on organic and mineral chemistry, trace metal cycling in surface ecosystems, and biochemical markers in aquatic systems. I will continue my work on characterizing suspended particulate matter using chemical biomarkers and exploring organic-mineral interactions in rivers with varying hydrologic regimes. I received my Ph.D. in Water Chemistry in 2016 at the University of Lorraine, Nancy, France.


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Michael R. Shields

My primary interests lie in the biogeochemical cycling of carbon in aquatic and terrestrial ecosystems, particularly at the crossroads of both. Currently, I am exploring the fate and burial efficiency of organic carbon within deltaic soils and sediments of the Wax Lake Delta, Louisiana. This delta is unique due to its relatively young age (subaerial since 1973) and the fact that it is building land while the majority of surrounding coastline is losing it. I’ll be initially taking measurements of the soil/sediment organic carbon pool along a soil chronosequence, which will then be fine-tuned by focusing on the individual mechanisms responsible for preserving organic carbon over longer periods of time. This is all done by using chemical biomarkers, stable and radiogenic isotopes, soil aggregate structures, and organomineral binding measurements to uncover the carbon cycling story for this embryonic delta. This project will allow for a better estimate/understanding of the carbon sequestration potential for delta restoration projects, and connect the dots between the deposition of organic carbon in young delta soils and its ability to be preserved in delta lobes over a thousand years old.


Graduate Students

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Xiaowen Zhang
Ph.D. candidate

My research primarily focuses on the changes in carbon cycling that took place during the Holocene in the Alaskan Arctic, especially the response of continuous permafrost to the warming climate. In particular I am using compound specific isotope and radiocrabon analysis of fatty acids, as well as lignin phenols and pigments to reconstruct organic carbon inputs to sediments of the Colville River Delta (home to the largest river-confined continuous permafrost watershed in North America).


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Jack Hutchings
Ph.D. candidate

My research pursuits include understanding the dynamics of natural systems and how those systems interact with society. My research at present is focused on understanding the amount and quality of carbon stored in Arctic permafrost soils as well as the response of permafrost and stored carbon to a warming Arctic. My projects include using biomarkers to assess how the organic carbon composition of permafrost soils change during controlled laboratory incubations, the development of novel techniques for the extraction and analysis of amino acids, and exploration of permafrost sediment cores that contain a record spanning into the last glacial maximum. Together, these projects will assist in characterizing how these high latitude systems have responded to perturbations in the past in order to better predict the impacts of contemporary climate change.

I received my B.A. degree in philosophy in 2010 from the University of South Florida. During this time, my interests included the political philosophy of Plato and John Rawls as well as the embodiment thesis, which attempts to reconcile philosophical conceptions of the human mind with contemporary science. I later received my M.S. degree in geology in 2013 also from the University of South Florida where I used experimental marine biology to investigate the origin of incomplete drilling traces by naticid gastropods. This research directly impacted long-held assumptions on incomplete drill holes found in fossils throughout the Cenozoic used to interpret the nature of evolutionary predator-prey arms races.


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Derrick Vaughn
PhD Student

My research interests revolve around using geochemistry to create high-resolution paleoclimate records. The research I will be performing will involve the use of several biomarker-based proxies, including the LDI (long-chain diol index), the mass accumulation rates of diatom and coccolithophore biomarkers, and GDGTs (glycerol dialkyl glycerol tetraether).  My upcoming project will utilize these proxies to examine ENSO variability during the last glacial period in the tropical Pacific. This record can then be compared to North Atlantic records and ongoing modeling studies to examine the relationship of ENSO variability to abrupt climate events and to glacial climate forcings.


Visiting Scholars

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Bin Zhao

Ph.D. Student from Ocean University of China, Qingdao, China


Undergraduate Lab Assistants

angelicaAngelica Ares

Major: Biology


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Geethu Kurian
Major: Biology

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Jennifer Green

Major: Environmental Engineering


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Jonathan Roman

Major: Geological Sciences


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Kate Dobson

Major: Environmental Geoscience


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Lindsay Lockwood
Major: Plant Science
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