Articles | Volume 22, issue 10
Research article
30 May 2022
Research article |  | 30 May 2022

Towards reconstructing the Arctic atmospheric methane history over the 20th century: measurement and modelling results for the North Greenland Ice Core Project firn

Taku Umezawa, Satoshi Sugawara, Kenji Kawamura, Ikumi Oyabu, Stephen J. Andrews, Takuya Saito, Shuji Aoki, and Takakiyo Nakazawa

Data sets

Composition of firn air at the North Greenland Ice Core Project (NGRIP) site K. Kawamura, T. Umezawa, S. Sugawara, S. Ishidoya, K. Ishijima, T. Saito, I. Oyabu, S. Murayama, S. Morimoto, S. Aoki, and T. Nakazawa

Short summary
Greenhouse gas methane in the Arctic atmosphere has not been accurately reported for 1900–1980 from either direct observations or ice core reconstructions. By using trace gas data from firn (compacted snow layers above ice sheet), air samples at two Greenland sites, and a firn air transport model, this study suggests a likely range of the Arctic methane reconstruction for the 20th century. Atmospheric scenarios from two previous studies are also evaluated for consistency with the firn data sets.
Final-revised paper