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  Present state of global wetland extent and wetland methane modelling: methodology of a model inter-comparison project (WETCHIMP)

Wania, R., Melton, J. R., Hodson, E. L., Poulter, B., Ringeval, B., Spahni, R., et al. (2013). Present state of global wetland extent and wetland methane modelling: methodology of a model inter-comparison project (WETCHIMP). Geoscientific Model Development, 6, 617-641. doi:10.5194/gmd-6-617-2013.

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 Creators:
Wania, R., Author
Melton, J. R., Author
Hodson, E. L., Author
Poulter, B., Author
Ringeval, B., Author
Spahni, R., Author
Bohn, T., Author
Avis, C. A., Author
Chen, G., Author
Eliseev, A. V., Author
Hopcroft, P. O., Author
Riley, W. J., Author
Subin, Z. M., Author
Tian, H., Author
van Bodegom, P. M., Author
Kleinen, Thomas1, Author           
Yu, Z. C., Author
Singarayer, J. S., Author
Zürcher, S., Author
Lettenmaier, D. P., Author
Beerling, D. J., AuthorDenisov, S. N., AuthorPrigent, C., AuthorPapa, F., AuthorKaplan, J. O., Author more..
Affiliations:
1Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913566              

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 Abstract: The Wetland and Wetland CH4 Intercomparison of Models Project (WETCHIMP) was created to evaluate our present ability to simulate large-scale wetland characteristics and corresponding methane (CH4) emissions. A multi-model comparison is essential to evaluate the key uncertainties in the mechanisms and parameters leading to methane emissions. Ten modelling groups joined WETCHIMP to run eight global and two regional models with a common experimental protocol using the same climate and atmospheric carbon dioxide (CO2) forcing datasets. We reported the main conclusions from the intercomparison effort in a companion paper (Melton et al., 2013). Here we provide technical details for the six experiments, which included an equilibrium, a transient, and an optimized run plus three sensitivity experiments (temperature, precipitation, and atmospheric CO2 concentration). The diversity of approaches used by the models is summarized through a series of conceptual figures, and is used to evaluate the wide range of wetland extent and CH4 fluxes predicted by the models in the equilibrium run. We discuss relationships among the various approaches and patterns in consistencies of these model predictions. Within this group of models, there are three broad classes of methods used to estimate wetland extent: prescribed based on wetland distribution maps, prognostic relationships between hydrological states based on satellite observations, and explicit hydrological mass balances. A larger variety of approaches was used to estimate the net CH4 fluxes from wetland systems. Even though modelling of wetland extent and CH4 emissions has progressed significantly over recent decades, large uncertainties still exist when estimating CH4 emissions: there is little consensus on model structure or complexity due to knowledge gaps, different aims of the models, and the range of temporal and spatial resolutions of the models.

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Language(s): eng - English
 Dates: 2013-052013-05
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.5194/gmd-6-617-2013
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Title: Geoscientific Model Development
  Abbreviation : GMD
Source Genre: Journal
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Publ. Info: Göttingen : Copernicus Publ.
Pages: - Volume / Issue: 6 Sequence Number: - Start / End Page: 617 - 641 Identifier: Other: 1991-959X
CoNE: https://pure.mpg.de/cone/journals/resource/1991-959X