Articles | Volume 19, issue 7
Atmos. Chem. Phys., 19, 4637–4658, 2019
https://doi.org/10.5194/acp-19-4637-2019
Atmos. Chem. Phys., 19, 4637–4658, 2019
https://doi.org/10.5194/acp-19-4637-2019

Research article 08 Apr 2019

Research article | 08 Apr 2019

Analysis of atmospheric CH4 in Canadian Arctic and estimation of the regional CH4 fluxes

Misa Ishizawa et al.

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Revised manuscript not accepted
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Cited articles

AMAP: Assesment 2015: Methane as an Arctic clilmate forcer, Arctic Monitoring ans Assessment Programme (AMAP), Oslo, Norway, 2015. 
Belikov, D. A., Maksyutov, S., Sherlock, V., Aoki, S., Deutscher, N. M., Dohe, S., Griffith, D., Kyro, E., Morino, I., Nakazawa, T., Notholt, J., Rettinger, M., Schneider, M., Sussmann, R., Toon, G. C., Wennberg, P. O., and Wunch, D.: Simulations of column-averaged CO2 and CH4 using the NIES TM with a hybrid sigma-isentropic (σ-θ) vertical coordinate, Atmos. Chem. Phys., 13, 1713–1732, https://doi.org/10.5194/acp-13-1713-2013, 2013. 
Bloom, A. A., Bowman, K. W., Lee, M., Turner, A. J., Schreder, R., Worden, J. R., Wedner, R. J., Mcdonald, K. C., and Jacob, D. J.: CMS: Global 0.5-deg Wetland Methane Emissions and Uncertainty (WetCHARTs v1.0), ORNL Distributed Active Archive Center, https://doi.org/10.3334/ORNLDAAC/1502, 2017a. 
Bloom, A. A., Bowman, K. W., Lee, M., Turner, A. J., Schroeder, R., Worden, J. R., Weidner, R., McDonald, K. C., and Jacob, D. J.: A global wetland methane emissions and uncertainty dataset for atmospheric chemical transport models (WetCHARTs version 1.0), Geosci. Model Dev., 10, 2141–2156, https://doi.org/10.5194/gmd-10-2141-2017, 2017b. 
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The Canadian Arctic has the potential for enhanced methane (CH4) emissions under global warming. However, the regional CH4 emission (fluxes) estimates range widely. This study analyzes recent Canadian Arctic CH4 observations and estimates the regional emissions. The additional observations yield robust CH4 flux estimates and enable the partitioning of the CH4 sources into wetland and forest fires. The results indicate that years with warmer summer conditions result in more wetland CH4 emissions.
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