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We describe the design and testing of a flexible bag ("Lung") accumulatorattached to a gas chromatographic (GC) analyzer capable of measuringsurface-atmosphere greenhouse gas exchange fluxes in a wide range ofenvironmental/agricultural settings. In the design presented here, theLung can collect up to three gas samples concurrently, each accumulated intoa Tedlar bag over a period of 20 min or longer.Toggling collection between 2 sets of 3 bags enables quasi-continuouscollection with sequential analysis and discarding of sample residues. TheLung thus provides a flexible "front end" collection system forinterfacing to a GC or alternative analyzer and has been used in 2 maintypes of application. Firstly, it has been applied to micrometeorologicalassessment of paddock-scale N2O fluxes, discussed here. Secondly, ithas been used for the automation of concurrent emission assessment fromthree sheep housed in metabolic crates with gas tracer addition and samplingmultiplexed to a single GC. The Lung allows the same GC equipment used in laboratory discrete sampleanalysis to be deployed for continuous field measurement. Continuity ofmeasurement enables spatially-averaged N2O fluxes in particular to bedetermined with greater accuracy, given the highly heterogeneous andepisodic nature of N2O emissions. We present a detailed evaluation ofthe micrometeorological flux estimation alongside an independent tuneablediode laser system, reporting excellent agreement between flux estimatesbased on downwind vertical concentration differences. Whilst the currentdesign is based around triplet bag sets, the basic design could be scaled upto a larger number of inlets or bags and less frequent analysis (longeraccumulation times) where a greater number of sampling points are required

The &quot;Lung&quot;: a software-controlled air accumulator for quasi-continuous multi-point measurement of agricultural greenhouse gases

The "Lung": a software-controlled air accumulator for quasi-continuous multi-point measurement of agricultural greenhouse gases