Lison Soussaintjean

CL Climate: Past, Present & Future

The 2025 Outstanding Student and PhD candidate Presentation (OSPP) Award is awarded to Lison Soussaintjean for the poster/PICO entitled:

Towards understanding the N₂O production in dust-rich Antarctic ice (Soussaintjean, L.; Schmitt, J.; Savarino, J.; Menking, A.; Brook, E.; Seth, B.; Röckmann, T.; Fischer, H.)

Click here to download the poster/PICO file.

Lison Soussaintjean is a PhD candidate at the Department of Climate and Environmental Physics, University of Bern, Switzerland. Her research focuses on reconstructing past atmospheric N₂O concentrations from polar ice cores and using isotope analyses to understand past changes in N₂O sources. A key challenge is understanding the production of excess N₂O in dust-rich Antarctic ice (referred to as “in situ N₂O”) that masks the atmospheric signal recorded in ice cores. At EGU, she presented new N₂O isotope analyses showing that this in situ N₂O is “hybrid”: one nitrogen atom comes from nitrate (NO₃^-), while the other originates from an unknown nitrogen source. This work is an important step toward identifying and correcting in situ N₂O production to improve past atmospheric reconstructions.