Detectability of Arctic methane sources at six sites performing continuous atmospheric measurements
Abstract
Understanding the recent evolution of methane emissions in the Arctic is necessary to interpret the global methane cycle. Emissions are affected by significant uncertainties and are sensitive to climate change, leading to potential feedbacks. A polar version of the CHIMERE chemistry-transport model is used to simulate the evolution of tropospheric methane in the Arctic during 2012, including all known regional anthropogenic and natural sources, in particular freshwater emissions which are often overlooked in methane modelling. CHIMERE simulations are compared to atmospheric continuous observations at six measurement sites in the Arctic region. In winter, the Arctic is dominated by anthropogenic emissions; emissions from continental seepages and oceans, including from the East Siberian Arctic Shelf, can contribute significantly in more limited areas. In summer, emissions from wetland and freshwater sources dominate across the whole region. The model is able to reproduce the seasonality and synoptic variations of methane measured at the different sites. We find that all methane sources significantly affect the measurements at all stations at least at the synoptic scale, except for biomass burning. In particular, freshwater systems play a decisive part in summer, representing on average between 11 and 26 % of the simulated Arctic methane signal at themore »
- Authors:
-
- Univ. Paris-Saclay, Gif-sur-Yvette (France)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Purdue Univ., West Lafayette, IN (United States)
- Dept. of Geological Sciences and Bolin Centre for Climate Research, Stockholm (Sweden)
- Linkoping Univ., Linkoping (Sweden)
- NOAA Earth System Research Lab., Boulder, CO (United States)
- Northeast Science Station, Cherskiy (Russia)
- Finnish Meteorological Institute, Helsinki (Finland)
- NILU-Norwegian Institute for Air Research, Kjeller (Norway)
- Environment Canada, Toronto, ON (Canada)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1398216
- Report Number(s):
- PNNL-SA-128395
Journal ID: ISSN 1680-7324
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Atmospheric Chemistry and Physics (Online)
- Additional Journal Information:
- Journal Volume: 17; Journal Issue: 13; Journal ID: ISSN 1680-7324
- Publisher:
- European Geosciences Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Thonat, Thibaud, Saunois, Marielle, Bousquet, Philippe, Pison, Isabelle, Tan, Zeli, Zhuang, Qianlai, Crill, Patrick M., Thornton, Brett F., Bastviken, David, Dlugokencky, Ed J., Zimov, Nikita, Laurila, Tuomas, Hatakka, Juha, Hermansen, Ove, and Worthy, Doug E. J. Detectability of Arctic methane sources at six sites performing continuous atmospheric measurements. United States: N. p., 2017.
Web. doi:10.5194/acp-17-8371-2017.
Thonat, Thibaud, Saunois, Marielle, Bousquet, Philippe, Pison, Isabelle, Tan, Zeli, Zhuang, Qianlai, Crill, Patrick M., Thornton, Brett F., Bastviken, David, Dlugokencky, Ed J., Zimov, Nikita, Laurila, Tuomas, Hatakka, Juha, Hermansen, Ove, & Worthy, Doug E. J. Detectability of Arctic methane sources at six sites performing continuous atmospheric measurements. United States. https://doi.org/10.5194/acp-17-8371-2017
Thonat, Thibaud, Saunois, Marielle, Bousquet, Philippe, Pison, Isabelle, Tan, Zeli, Zhuang, Qianlai, Crill, Patrick M., Thornton, Brett F., Bastviken, David, Dlugokencky, Ed J., Zimov, Nikita, Laurila, Tuomas, Hatakka, Juha, Hermansen, Ove, and Worthy, Doug E. J. 2017.
"Detectability of Arctic methane sources at six sites performing continuous atmospheric measurements". United States. https://doi.org/10.5194/acp-17-8371-2017. https://www.osti.gov/servlets/purl/1398216.
@article{osti_1398216,
title = {Detectability of Arctic methane sources at six sites performing continuous atmospheric measurements},
author = {Thonat, Thibaud and Saunois, Marielle and Bousquet, Philippe and Pison, Isabelle and Tan, Zeli and Zhuang, Qianlai and Crill, Patrick M. and Thornton, Brett F. and Bastviken, David and Dlugokencky, Ed J. and Zimov, Nikita and Laurila, Tuomas and Hatakka, Juha and Hermansen, Ove and Worthy, Doug E. J.},
abstractNote = {Understanding the recent evolution of methane emissions in the Arctic is necessary to interpret the global methane cycle. Emissions are affected by significant uncertainties and are sensitive to climate change, leading to potential feedbacks. A polar version of the CHIMERE chemistry-transport model is used to simulate the evolution of tropospheric methane in the Arctic during 2012, including all known regional anthropogenic and natural sources, in particular freshwater emissions which are often overlooked in methane modelling. CHIMERE simulations are compared to atmospheric continuous observations at six measurement sites in the Arctic region. In winter, the Arctic is dominated by anthropogenic emissions; emissions from continental seepages and oceans, including from the East Siberian Arctic Shelf, can contribute significantly in more limited areas. In summer, emissions from wetland and freshwater sources dominate across the whole region. The model is able to reproduce the seasonality and synoptic variations of methane measured at the different sites. We find that all methane sources significantly affect the measurements at all stations at least at the synoptic scale, except for biomass burning. In particular, freshwater systems play a decisive part in summer, representing on average between 11 and 26 % of the simulated Arctic methane signal at the sites. This indicates the relevance of continuous observations to gain a mechanistic understanding of Arctic methane sources. Sensitivity tests reveal that the choice of the land-surface model used to prescribe wetland emissions can be critical in correctly representing methane mixing ratios. The closest agreement with the observations is reached when using the two wetland models which have emissions peaking in August–September, while all others reach their maximum in June–July. Such phasing provides an interesting constraint on wetland models which still have large uncertainties at present. Also testing different freshwater emission inventories leads to large differences in modelled methane. Attempts to include methane sinks (OH oxidation and soil uptake) reduced the model bias relative to observed atmospheric methane. Here, the study illustrates how multiple sources, having different spatiotemporal dynamics and magnitudes, jointly influence the overall Arctic methane budget, and highlights ways towards further improved assessments.},
doi = {10.5194/acp-17-8371-2017},
url = {https://www.osti.gov/biblio/1398216},
journal = {Atmospheric Chemistry and Physics (Online)},
issn = {1680-7324},
number = 13,
volume = 17,
place = {United States},
year = {Tue Jul 11 00:00:00 EDT 2017},
month = {Tue Jul 11 00:00:00 EDT 2017}
}
Web of Science
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- Atmospheric Chemistry and Physics, Vol. 17, Issue 18
Assessment of the theoretical limit in instrumental detectability of northern high-latitude methane sources using δ13CCH4 atmospheric signals
journal, January 2019
- Thonat, Thibaud; Saunois, Marielle; Pison, Isabelle
- Atmospheric Chemistry and Physics, Vol. 19, Issue 19
Monthly gridded data product of northern wetland methane emissions based on upscaling eddy covariance observations
journal, January 2019
- Peltola, Olli; Vesala, Timo; Gao, Yao
- Earth System Science Data, Vol. 11, Issue 3
Variability and quasi-decadal changes in the methane budget over the period 2000–2012
text, January 2017
- Saunois, Marielle; Bousquet, Philippe; Poulter, Ben
- European Geosciences Union
Monthly gridded data product of northern wetland methane emissions based on upscaling eddy covariance observations
text, January 2019
- Peltola, Olli; Vesala, Timo; Gao, Yao
- Copernicus Publications
Monthly gridded data product of northern wetland methane emissions based on upscaling eddy covariance observations
text, January 2019
- Peltola, Olli; Vesala, Timo; Gao, Yao
- Karlsruhe