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
This database is made freely available to the scientific community and is intended to stimulate and support the global methane cycle and other modeling studies. We rely on the ethics and integrity of the user to assure that the authors receive fair credit for their work. Fair credit will depend on the nature of the work and the requirements of the institutions involved. Your use of this database implies an agreement to contact the database co-authors to discuss the nature of the work and the appropriate level of acknowledgment. If the database is essential to the work, or if an important result or conclusion depends on the database, co-authorship may be appropriate. This should be discussed with the data providers at an early stage in the work. Contacting the data providers is not optional; if you use the database, you must contact the data providers. A co-author email distribution list is provided during the database download process, which generates an automated e-mail to the user containing all relevant information.
Required Citation
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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