Jen works on examining the role of redox-active metals in carbon and nitrogen cycling – with a specific focus on greenhouse gas production (N2O and CH4). She is developing a more sophisticated understanding of the potential role of ‘un-conventional’ processes in the dynamics of N2O production in coastal sediments. Specifically, she is working to examine the metabolic activity of fungal denitrification as well as the possible contribution of reactive Fe(II) (e.g., ‘chemodenitrification’) and Mn to fluxes of N2O using a suite of various novel stable isotopic approaches. Recent work includes defining isotopic dynamics of reactions of Mn(III) with nitrogen intermediates such as nitrite and hydroxylamine, as well as investigating the role of oxidized forms of Fe and Mn in regulating anaerobic oxidation of CH4 in marine sediments.
Don’s interests lie at the physiological interface of trace metals and nitrogen cycling. Specifically, he is working to investigate how trace metal availability (Fe, Cu) and speciation may impact microbial nitrification, with specific implications for the dynamics of isotope fractionation and N2O production and fluxes in the ocean and elsewhere.
Lina comes to us with a background in methane isotopic analysis, but is now cutting her teeth testing our newly developed in situ chemiluminescent analyzer (SOLARIS) with the Hansel Lab. Her first project has been calibrating SOLARIS for analysis of superoxide in deep sea biological communities.
With a background in chemistry, Luciana joined the lab in 2020 and plans to focus on interactions between nitrogen and manganese cycling in surface ocean, local ponds and the Baltic Sea.
Sam Bowman joined us in late 2019 to help with keeping instruments and protocols in tip-top shape.
Zoe has been developing a multi-process, multi-species, multi-isotope mass balance model for application to unraveling complex systems of nitrogen cycling networks in coastal sediments. She is leveraging steady-state measurements of N and O isotopes in nitrate, nitrite, dissolved organic nitrogen, ammonium and nitrous oxide – to simultaneously solve for rates of 11 (eleven!) nitrogen cycling processes, and putting unique constraints on their associated isotope effects. Powerful stuff…
Maybe Gone, But Never Forgotten…
Jarek Kwiecinski (MIT)
Undergraduate researcher on N/Mn interactions
Chawalit "Net" Charoenpong
Now professor at Chulalongkorn University in Bangkok, Thailand.