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Modeling regional to global CH4 emissions of boreal and arctic wetlands

Petrescu, A.M.R.; van Beek, L.P.H.; van Huissteden, J.; Prigent, C.; Sachs, T.; Corradi, C.A.R.; Parmentier, Frans-Jan LU and Dolman, A.J. (2010) In Global Biogeochemical Cycles 24(4).
Abstract
Methane (CH4) emission from boreal, 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 degrees 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... (More)
Methane (CH4) emission from boreal, 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 degrees 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 parameterization 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 annual flux over the period 2001-2006 was estimated to be 78 Tg yr(-1). In comparison, the six-year average CH4 fluxes were 37.7, 89.4, 145.6, and 157.3 Tg yr(-1) for different estimates of wetland extends based on the studies by Matthews and Fung, Prigent et al., Lehner and Doll, 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. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
METHANE EMISSIONS, NATURAL WETLANDS, ATMOSPHERIC METHANE, CARBON, CLIMATE, PARAMETERIZATION, SENSITIVITY, PERMAFROST, BUDGET, TUNDRA
in
Global Biogeochemical Cycles
volume
24
issue
4
publisher
American Geophysical Union
external identifiers
  • other:Article number GB4009
  • scopus:77956537442
ISSN
0886-6236
DOI
10.1029/2009GB003610
language
English
LU publication?
no
id
341662d3-6352-442c-952d-7a15935a06d4 (old id 4221410)
date added to LUP
2014-01-08 16:07:50
date last changed
2018-06-17 04:35:22
@article{341662d3-6352-442c-952d-7a15935a06d4,
  abstract     = {Methane (CH4) emission from boreal, 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 degrees 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 parameterization 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 annual flux over the period 2001-2006 was estimated to be 78 Tg yr(-1). In comparison, the six-year average CH4 fluxes were 37.7, 89.4, 145.6, and 157.3 Tg yr(-1) for different estimates of wetland extends based on the studies by Matthews and Fung, Prigent et al., Lehner and Doll, 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.},
  author       = {Petrescu, A.M.R. and van Beek, L.P.H. and van Huissteden, J. and Prigent, C. and Sachs, T. and Corradi, C.A.R. and Parmentier, Frans-Jan and Dolman, A.J.},
  issn         = {0886-6236},
  keyword      = {METHANE EMISSIONS,NATURAL WETLANDS,ATMOSPHERIC METHANE,CARBON,CLIMATE,PARAMETERIZATION,SENSITIVITY,PERMAFROST,BUDGET,TUNDRA},
  language     = {eng},
  number       = {4},
  publisher    = {American Geophysical Union},
  series       = {Global Biogeochemical Cycles},
  title        = {Modeling regional to global CH4 emissions of boreal and arctic wetlands},
  url          = {http://dx.doi.org/10.1029/2009GB003610},
  volume       = {24},
  year         = {2010},
}