First field measurements of laughing gas isotopes

Thanks to a newly developed laser spectrometer, Empa researchers can for the first time show which processes in grassland lead to nitrous oxide emissions. The aim is to reduce emissions of this potent greenhouse gas by gaining a better understanding of the processes taking place in the soil. Nitrous oxide (N₂O, also known as laughing gas) is one of the most important greenhouse gases. Although it is much less abundant in the atmosphere than carbon dioxide (CO₂), it is around 300 times more potent. N₂O remains in the atmosphere for more than 100 years and thus contributes largely to global warming. It also damages the Earth's protective ozone layer. The largest source of N₂O emissions is soil - especially (but not only) when fertilised.