Code for global wetland d13C-CH4 model (isoTEM)

Wetlands are the largest single natural methane (CH4) source and strongly influence atmospheric stable carbon isotope (δ13C-CH4) changes, but the spatial and temporal information of wetland δ13C-CH4 is limited. Studies show that source partitioning in atmospheric modeling is highly sensitive to spatio-temporal understanding of wetland δ13C-CH4. Here, we use a process-based carbon isotope biogeochemistry model, isoTEM, to calculate the δ13C-CH4 of global wetland emissions. We estimated the mean global wetland source signature to be -61.3±0.7‰ during 1984-2016. The latitudinal distribution of δ13C-CH4 ranges from a mean of -57±3‰ in the tropics to -68±4‰ in boreal regions. Our model simulates isotopically depleted global δ13C-CH4 during the summer due to larger emissions from boreal regions and a long-term trend of -0.7±0.1‰ during 1984-2016 when incorporating the long-term trend in δ13C-POM. A detailed explanation of the model results can be found in the corresponding publication. This website contains one zipped file and two pdf files to help you understand and simulate isoTEM model.

Fair Use Statement

These data are made freely available to the public and the scientific community in the belief that their wide dissemination will lead to greater understanding and new scientific insights. To ensure that GML receives fair credit for their work please include relevant citation text in publications. We encourage users to contact the data providers, who can provide detailed information about the measurements and scientific insight. In cases where the data are central to a publication, co-authorship for data providers may be appropriate.

Citation

This database has a Digital Object Identifier (DOI) registered with the International DOI Foundation (https://doi.org/10.15138/cem6-ka15). The database accompanies an article in the journal Communications Earth and Environment. In addition to the conditions of fair use as stated above, users should also include the following citation in any publication or presentation using the product:

Oh, Y., Zhuang, Q., Welp, L.R. et al. Improved global wetland carbon isotopic signatures support post-2006 microbial methane emission increase. Commun Earth Environ 3, 159 (2022). https://doi.org/10.1038/s43247-022-00488-5


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Code for global wetland d13C-CH4 model (isoTEM)

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