TransCom model simulations of CH4 and related species: linking transport, surface flux and chemical loss with CH4 variability in the troposphere and lower stratosphere

A chemistry-transport model (CTM) intercompar- ison experiment (TransCom-CH4) has been designed to in- vestigate the roles of surface emissions, transport and chemi- cal loss in simulating the global methane distribution. Model simulations were conducted using twelve models and four model variants and results were archived for the period of 1990-2007. All but one model transports were driven by reanalysis products from 3 different meteorological agen- cies. The transport and removal of CH4 in six different emission scenarios were simulated, with net global emis- sions of 513± 9 and 514± 14 Tg CH4 yr 1 for the 1990s

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