Premium
Measurements of δ 13 C in CH 4 and using particle dispersion modeling to characterize sources of Arctic methane within an air mass
Author(s) -
France J. L.,
Cain M.,
Fisher R. E.,
Lowry D.,
Allen G.,
O'Shea S. J.,
Illingworth S.,
Pyle J.,
Warwick N.,
Jones B. T.,
Gallagher M. W.,
Bower K.,
Le Breton M.,
Percival C.,
Muller J.,
Welpott A.,
Bauguitte S.,
George C.,
Hayman G. D.,
Manning A. J.,
Myhre C. Lund,
Lanoisellé M.,
Nisbet E. G.
Publication year - 2016
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/2016jd026006
Subject(s) - methane , atmospheric methane , environmental science , arctic , atmospheric sciences , atmospheric dispersion modeling , dispersion (optics) , planetary boundary layer , air mass (solar energy) , trace gas , isotopic signature , atmosphere (unit) , altitude (triangle) , air pollution , boundary layer , meteorology , geology , isotope , oceanography , physics , chemistry , nuclear physics , geometry , mathematics , organic chemistry , optics , thermodynamics
A stratified air mass enriched in methane (CH 4 ) was sampled at ~600 m to ~2000 m altitude, between the north coast of Norway and Svalbard as part of the Methane in the Arctic: Measurements and Modelling campaign on board the UK's BAe‐146‐301 Atmospheric Research Aircraft. The approach used here, which combines interpretation of multiple tracers with transport modeling, enables better understanding of the emission sources that contribute to the background mixing ratios of CH 4 in the Arctic. Importantly, it allows constraints to be placed on the location and isotopic bulk signature of the emission source(s). Measurements of δ 13 C in CH 4 in whole air samples taken while traversing the air mass identified that the source(s) had a strongly depleted bulk δ 13 C CH 4 isotopic signature of −70 (±2.1)‰. Combined Numerical Atmospheric‐dispersion Modeling Environment and inventory analysis indicates that the air mass was recently in the planetary boundary layer over northwest Russia and the Barents Sea, with the likely dominant source of methane being from wetlands in that region.