If you are senior graduate student or postdoc interested in joining our group, please consider applying to
- Lamont-Doherty Earth Observatory Postdoctoral Fellowships
- NSF Atmospheric Science Postdoctoral Research Fellowships
Or contact Róisín with an overview of your research interests to discuss proposal ideas. There are no open positions in the group at the moment.
Research Overview
We investigate surface - atmosphere fluxes of greenhouse gases and air pollutants using field measurements, atmospheric trace gas observations and various modeling tools and the ecosystem processes driving these fluxes. Our urban work is hosted on the New York Atmospheric composition and Air Quality (NYAAQ) website. We focus on carbon (CO2 and methane) fluxes for our Arctic tundra and Boreal ecosystems. Our global approach to quantifying carbon fluxes is explained in the CarbonFOX project and more recently through collaborations with the MethaneSAT mission.
Recent News
Hallward-Driemeier, A., Zhao, Y., Drews, M., Sargent, M., Wofsy, S., Barton-Grimley, R., Yerasi, A., Collins, J., Nehrir, A., and Commane, R.: Seasonal Landfill Methane Emissions Driven by Temperature and Pressure, Environ. Sci. Technol., https://doi.org/10.1021/acs.est.5c16757, 2026.
Dandan Wei's ES&T paper: High-Resolution Modeling of Summertime Biogenic Isoprene Emissions in New York City received a lot of interest from NYC news! Kevin Krajick at LDEO wrote a press release that interested many media outlets, some of which wasn't quite what we intended. But thankfully, Austyn Gaffney interviewed Dandan, Andrew Reinmann and Roisin for a really well written article in the New York Times: New York City's Trees Work Hard. Still, they could use a little help that explained the link between biogenic volatile organic compounds…
Oaks and sweetgums, which currently account for a majority of New York City’s trees, produce huge amounts of volatile compounds called isoprenes. Harmless by themselves, isoprenes interact rapidly with polluting nitrogen oxides emitted from combustion (by vehicles, buildings and industry) to form ground-level ozone―a prime factor in many respiratory ailments, especially chronic bronchitis and asthma.
A new peer-reviewed article evaluates a first-of-its-kind pilot project to study the effects of residential cooking electrification (gas-to-induction) in a public housing setting in the U.S. Results suggest the effectiveness of electric stoves as a means to reduce nitrogen dioxide (NO2) exposure in the home with households that replaced their gas stove for an induction stove registering a 56% drop in NO2 concentrations compared to households that still had gas stoves. Participants also unanimously reported satisfaction with their induction stoves and cited significant quality of life…
Yuwei attended the 2024 Summer School for Inverse Modeling of Greenhouse Gases, Fort Collins, CO, June 2024
The group attended three workshops in Boulder, CO over the space of two weeks in May to present on our Arctic and urban work.
Congratulations to Dr Ludda Ludwig on brilliantly defending her PhD dissertation. Ludda was an amazing student to work with over the last 4.5 years! While we are sorry to lose her, we are delighted that she has taken a position at the US EPA to focus on methane. Best wishes for the future Dr. Ludwig!!
Roisin gave the April Public Lecture at Lamont Doherty Earth Observatory:
Clearing the Air: Understanding New York City's Air Quality and Climate
Thanks to all who joined in person. The lecture was recorded and is available on Lamont's YouTube channel alongside all the previous Lectures:
https://www.youtube.com/watch?v=qtMcAQVOvUk
Many of the group presented at the American Geophysical Union (AGU) Fall meeting in San Francisco, CA in December 2023.
Ludda had her second paper published (Ludwig et al., 2023) and she has submitted her third paper to Biogeosciences Discussion.
She is now working on her fourth paper and we're all excited to see those results. Congrats Ludda!
