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  Modeled Microbial Dynamics Explain the Apparent Temperature Sensitivity of Wetland Methane Emissions

Chadburn, S. E., Aalto, T., Aurela, M., Baldocchi, D., Biasi, C., Boike, J., Burke, E. J., Comyn‐Platt, E., Dolman, A. J., Duran‐Rojas, C., Fan, Y., Friborg, T., Gao, Y., Gedney, N., Göckede, M., Hayman, G. D., Holl, D., Hugelius, G., Kutzbach, L., Lee, H., Lohila, A., Parmentier, F. W., Sachs, T., Shurpali, N. J., Westermann, S. (2020): Modeled Microbial Dynamics Explain the Apparent Temperature Sensitivity of Wetland Methane Emissions. - Global Biogeochemical Cycles, 34, 11, e2020GB006678.
https://doi.org/10.1029/2020GB006678

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004026 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004026_1
Genre: Journal Article

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 Creators:
Chadburn, Sarah E.1, Author
Aalto, Tuula1, Author
Aurela, Mika1, Author
Baldocchi, Dennis1, Author
Biasi, Christina1, Author
Boike, Julia1, Author
Burke, Eleanor J.1, Author
Comyn‐Platt, Edward1, Author
Dolman, A. Johannes1, Author
Duran‐Rojas, Carolina1, Author
Fan, Yuanchao1, Author
Friborg, Thomas1, Author
Gao, Yao1, Author
Gedney, Nicola1, Author
Göckede, Mathias1, Author
Hayman, Garry D.1, Author
Holl, David1, Author
Hugelius, Gustaf1, Author
Kutzbach, Lars1, Author
Lee, Hanna1, Author
Lohila, Annalea1, AuthorParmentier, Frans‐Jan W.1, AuthorSachs, T.2, Author              Shurpali, Narasinha J.1, AuthorWestermann, Sebastian1, Author more..
Affiliations:
1External Organizations, ou_persistent22              
21.4 Remote Sensing, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146028              

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Free keywords: methane, wetland methane, microbial modeling, global modeling, methanogens
 Abstract: Methane emissions from natural wetlands tend to increase with temperature and therefore may lead to a positive feedback under future climate change. However, their temperature response includes confounding factors and appears to differ on different time scales. Observed methane emissions depend strongly on temperature on a seasonal basis, but if the annual mean emissions are compared between sites, there is only a small temperature effect. We hypothesize that microbial dynamics are a major driver of the seasonal cycle and that they can explain this apparent discrepancy. We introduce a relatively simple model of methanogenic growth and dormancy into a wetland methane scheme that is used in an Earth system model. We show that this addition is sufficient to reproduce the observed seasonal dynamics of methane emissions in fully saturated wetland sites, at the same time as reproducing the annual mean emissions. We find that a more complex scheme used in recent Earth system models does not add predictive power. The sites used span a range of climatic conditions, with the majority in high latitudes. The difference in apparent temperature sensitivity seasonally versus spatially cannot be recreated by the non‐microbial schemes tested. We therefore conclude that microbial dynamics are a strong candidate to be driving the seasonal cycle of wetland methane emissions. We quantify longer‐term temperature sensitivity using this scheme and show that it gives approximately a 12% increase in emissions per degree of warming globally. This is in addition to any hydrological changes, which could also impact future methane emissions.

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Language(s): eng - English
 Dates: 2020-11-182020
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1029/2020GB006678
GFZPOF: p3 PT3 Earth Surface and Climate Interactions
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Title: Global Biogeochemical Cycles
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 34 (11) Sequence Number: e2020GB006678 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals191