File : D4.5
Author : Tuula Aalto (FMI) et al.
Natural CH4 emissions are an important component of the global CH4 budget, comprising approximately 40% of the total emissions. The largest source of natural emissions is from wetlands with a smaller, but very uncertain, contribution from inland water bodies. This deliverable provides estimates of natural emissions of CH4 from wetlands and inland water bodies, as well as fluxes to/from mineral soils. Two modelling frameworks are used to estimate the emissions: 1) the combined model JSBACH-HIMMELI, which is used to estimate wetland and mineral soil emissions, and 2) an empirical model of inland water emissions. JSBACH-HIMMELI is a process-based model consisting of a land-surface model, JSBACH, which is used to drive a model of CH4 emissions from wetlands, HIMMELI. The inland water bodies model is empirical and scales-up measurements of CH4 emissions from lakes and reservoirs to the European scale relying on proxy data. Results are presented from both models as gridded maps at 0.1°×0.1° resolution for Europe (see Section 4.2).
Figure 1 : Estimated CH4 emission from lakes and reservoirs. Flux rates refer to total continental area.
