Articles | Volume 17, issue 7
Research article
 | Highlight paper
05 Apr 2017
Research article | Highlight paper |  | 05 Apr 2017

Constraining N2O emissions since 1940 using firn air isotope measurements in both hemispheres

Markella Prokopiou, Patricia Martinerie, Célia J. Sapart, Emmanuel Witrant, Guillaume Monteil, Kentaro Ishijima, Sophie Bernard, Jan Kaiser, Ingeborg Levin, Thomas Blunier, David Etheridge, Ed Dlugokencky, Roderik S. W. van de Wal, and Thomas Röckmann


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Discussed (final revised paper)

Latest update: 17 Apr 2024
Short summary
Nitrous oxide is the third most important anthropogenic greenhouse gas with an increasing mole fraction. To understand its natural and anthropogenic sources we employ isotope measurements. Results show that while the N2O mole fraction increases, its heavy isotope content decreases. The isotopic changes observed underline the dominance of agricultural emissions especially at the early part of the record, whereas in the later decades the contribution from other anthropogenic sources increases.
Final-revised paper