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Using δ¹³C-CH₄ and δD-CH₄ to constrain Arctic methane emissions

Published version
Peer-reviewed

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Authors

Warwick, NJ 
Cain, ML 
Fisher, R 
France, JL 
Lowry, D 

Abstract

© Author(s) 2016.We present a global methane modelling study assessing the sensitivity of Arctic atmospheric CH₄ mole fractions, δ¹³C-CH₄ and δD-CH₄ to uncertainties in Arctic methane sources. Model simulations include methane tracers tagged by source and isotopic composition and are compared with atmospheric data at four northern high-latitude measurement sites. We find the model's ability to capture the magnitude and phase of observed seasonal cycles of CH₄ mixing ratios, δ¹³C-CH₄ and δD-CH₄ at northern high latitudes is much improved using a later spring kick-off and autumn decline in northern high-latitude wetland emissions than predicted by most process models. Results from our model simulations indicate that recent predictions of large methane emissions from thawing submarine permafrost in the East Siberian Arctic Shelf region could only be reconciled with global-scale atmospheric observations by making large adjustments to high-latitude anthropogenic or wetland emission inventories.

Description

Keywords

37 Earth Sciences, 3701 Atmospheric Sciences, 3705 Geology, 13 Climate Action

Journal Title

Atmospheric Chemistry and Physics

Conference Name

Journal ISSN

1680-7316
1680-7324

Volume Title

16

Publisher

Copernicus Publications
Sponsorship
Natural Environment Research Council (NE/I029161/1)
Natural Environment Research Council (NE/I010750/1)
Natural Environment Research Council (NE/K004964/1)
European Research Council (267760)
National Centre for Atmospheric Science (NERC) (via University of Leeds) (R8H12/83/009)
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