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| Titel |
Present state of global wetland extent and wetland methane modelling: methodology of a model inter-comparison project (WETCHIMP) |
| VerfasserIn |
R. Wania, J. R. Melton, E. L. Hodson, B. Poulter, B. Ringeval, R. Spahni, T. Bohn, C. A. Avis, G. Chen, A. V. Eliseev, P. O. Hopcroft, W. J. Riley, Z. M. Subin, H. Tian, P. M. Bodegom, T. Kleinen, Z. C. Yu, J. S. Singarayer, S. Zürcher, D. P. Lettenmaier, D. J. Beerling, S. N. Denisov, C. Prigent, F. Papa, J. O. Kaplan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 3 ; Nr. 6, no. 3 (2013-05-15), S.617-641 |
| Datensatznummer |
250017816
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| Publikation (Nr.) |
 copernicus.org/gmd-6-617-2013.pdf |
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| Zusammenfassung |
| 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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