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Home > Society and Social Sciences > Politics and government > Modeling Modern Methane Emissions from Natural Wetlands: 2; Interannual Variations 1982-1993
Modeling Modern Methane Emissions from Natural Wetlands: 2; Interannual Variations 1982-1993

Modeling Modern Methane Emissions from Natural Wetlands: 2; Interannual Variations 1982-1993


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About the Book

A global run of a process-based methane model [Walter et al., this issue] is performed using high-frequency atmospheric forcing fields from ECMWF reanalyses of the period from 1982 to 1993. We calculate global annual methane emissions to be 260 Tg/ yr. 25% of methane emissions originate from wetlands north of 30 deg. N. Only 60% of the produced methane is emitted, while the rest is re-oxidized. A comparison of zonal integrals of simulated global wetland emissions and results obtained by an inverse modeling approach shows good agreement. In a test with data from two wetlands, the seasonality of simulated and observed methane emissions agrees well. The effects of sub-grid scale variations in model parameters and input data are examined. Modeled methane emissions show high regional, seasonal and interannual variability. Seasonal cycles of methane emissions are dominated by temperature in high latitude wetlands, and by changes in the water table in tropical wetlands. Sensitivity tests show that +/- 1 C changes in temperature lead to +/- 20 % changes in methane emissions from wetlands. Uniform changes of +/- 20% in precipitation alter methane emissions by about +/- 18%. Limitations in the model are analyzed. Simulated interannual variations in methane emissions from wetlands are compared to observed atmospheric growth rate anomalies. Our model simulation results suggest that contributions from other sources than wetlands and/or the sinks are more important in the tropics than north-of 30 deg. N. In higher northern latitudes, it seems that a large part, of the observed interannual variations can be explained by variations in wetland emissions. Our results also suggest that reduced wetland emissions played an important role in the observed negative methane growth rate anomaly in 1992.


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Product Details
  • ISBN-13: 9781287275039
  • Publisher: Bibliogov
  • Publisher Imprint: Bibliogov
  • Height: 246 mm
  • No of Pages: 54
  • Spine Width: 3 mm
  • Weight: 113 gr
  • ISBN-10: 1287275036
  • Publisher Date: 02 Aug 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: 2; Interannual Variations 1982-1993
  • Width: 189 mm


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Modeling Modern Methane Emissions from Natural Wetlands: 2; Interannual Variations 1982-1993
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