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Titel |
Modelling regional to global CH4 emissions of boreal and arctic wetlands |
VerfasserIn |
A. M. R. Petrescu, L. P. H. Van Beek, J. van Huissteden, C. Prigent, T. Sachs, C. A. R. Corradi, F. J. W. Parmentier, A. J. Dolman |
Konferenz |
EGU General Assembly 2012
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 14 (2012) |
Datensatznummer |
250060427
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Zusammenfassung |
Methane (CH4) emission from arctic and subarctic wetlands constitutes a potentially positive
feedback to global climate warming. Many process-based models have been developed, but
high uncertainties remain in estimating the amount of CH4 released from wetlands at the
global scale. This study tries to improve estimates of CH4 emissions by up-scaling a wetland
CH4 emission model, PEATLAND-VU, to the global scale with a spatial resolution of 0.5°
for the period 2001–2006. This up-scaling was based on the global circum-arctic distribution
of wetlands with hydrological conditions being specified by a global hydrological model,
PCR-GLOBWB. In addition to the daily hydrological output from PCR-GLOBWB,
comprising water table depths and snow thickness, the parametrisation included air
temperature as obtained from the ECMWF Operational Archive. To establish the
uncertainty in the representations of the circum-arctic distribution of wetlands on the CH4
emission, several existing products were used to aggregate the emissions. Using the
description of potential peatlands from the FAO Digital Soil Map of the World and the
representation of floodplains by PCR-GLOBWB, the average flux over the period
2001–2006 was estimated to be 78 Tg yr-1. In comparison, the six-year average CH4
fluxes were 38, 89, 146, and 157 Tg yr-1 for different estimates of wetland extends
based on studies by Matthews and Fung, Prigent et al., Lehner and Döll and Kaplan,
respectively. This study shows the feasibility to estimate interannual variations in CH4
emissions by coupling hydrological and CH4 emission process models. It highlights the
importance of an adequate understanding of hydrology in quantifying the total emissions
from northern hemispheric wetlands and shows how knowledge of the sub-grid
variability in wetland extent helps to prescribe relevant hydrological conditions to the
emission model as well as to identify the uncertainty associated with existing wetland
distributions.
Reference
A. M. R. Petrescu, L. P. H. van Beek, J. van Huissteden, C. Prigent, T. Sachs, C. A. R.
Corradi, F. J. W. Parmentier, and A. J. Dolman, Global Biogeochem. Cycles, 24,
GB4009, doi:10.1029/2009GB003610, 2010. Copyright [2010] American Geophysical
Union.
Reproduced/modified by permission of American Geophysical Union. |
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