Orals

Methane is a potent greenhouse gas with ever-rising atmospheric concentrations. While anthropogenic sources are comparably well understood, it is still a major scientific challenge to understand and quantify the contribution of natural sources. One reason for this knowledge gap is that (bio)geochemical and geological controls on methane dynamics in aquatic and terrestrial systems as well as the spatial distribution of methane in marine and aquatic sediments, soils and permafrost areas is not well constrained.
The topics of the session will include:
- methane formation (biological and geological processes
- subsurface fluid flow and methane/hydrocarbon transport mechanisms
- ‘marine’ methane-rich systems: e.g. gas hydrates, shallow gas, cold seep-related systems
- ‘terrestrial’ methane-rich systems: e.g. wet lands (natural & artificial), lakes (from puddles to inland seas), permafrost areas and rivers
- methane-associated (bio)geochemical reactions, microbial communities and food web structures
- methane-derived carbonates and microbe-mineral interactions
- monitoring of methane emission
- methane in paleo environments

The session will highlight the significance of (geo)physical, geological, (bio/geo)chemical and (micro)biological controls on methane release in ocean, permafrost, wetlands, lake and river environments.
We will also discuss recent advances on gas hydrate properties & occurrences in sediments.
We aim at gathering scientists from the fields of geology, (bio/geo)chemistry, (geo)physics, modeling, (micro)biology and ecology, to evaluate our current knowledge of aquatic and terrestrial methane dynamics, interactions between element cycles and ecosystems, environmental controls and mechanisms.
A further intention is to create synergies between marine and terrestrial sciences for a multifaceted view on methane dynamics.
This session is also an invitation to scientists from the wider field of environmental geo- and/or bio-engineering dealing with natural methane emissions as an alternative energy source.
We also welcome specialists designing instruments for monitoring methane.