The Octopus


This “octopus” will control our mass flow controllers through analog voltage signals operated by a Campbell Scientific data logger.


Finding Luke Skywalker

Here are some photos from the beginning of the month. Rick Wehr had called the flow diagram of the environmental methane sampling system that we will deploy in Brazil “The map to find Luke Skywalker”. If the diagram is the map, then following the diagram may be considered “Finding Luke Skywalker”. Left, pre-assembly of the calibration system manifold. Right, the completed manifold without the two-way solenoid valves. The system now has some working code as well.


New Preprint Online

A preprint of my article, “Subterranean karst environments as a global sink for atmospheric methane” is now online. My team and I present research on 36 caves from across the world and show that the methane concentration of cave air is depleted compared to the atmosphere. Our work demonstrates that atmospheric methane is consumed by methanotrophic bacteria living in caves. Additionally, our work shows that the methanogenic processes of carbonate reduction and acetate fermentation are widespread in the environment. The article can be found here

Recommended citation:

Webster KD, Drobniak A, Etiope G, Mastalerz M, Sauer PE, Schimmelmann A (2017) . Subterranean karst environments as a global sink for atmospheric methane. Preprints, 2017080009.

Producing pastures


Our sampling from Rondônia, Brazil is showing that pastures are emitting methane whereas primary forests and secondary forests are neutral and weakly consuming respectively. What is behind the production in the pastures?