File : D4.4
Author : Rona Thompson (NILU)
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 mineral soils, as well as from inland water bodies. 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 (see Section 2.1.1). 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 (see Section 2.2.1). Results are presented from both models as gridded maps at 0.1°×0.1° resolution (see Section 3).
Figure 1 : Estimated CH4 emission from laked and reservoirs. Flux rates refer to total continental area.
