Developments in Flux Measurements of Greenhouse Gases

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The paper reviews methods for measuring the exchanges of gases between soil-plant systems and the atmosphere, with emphasis on the greenhouse gases CO₂ CH₄ and N₂O The methods vary in scale from chambers covering<1m² to convective boundary layer budgets for regions of 100 to 1000 km² They should be seen as complementary rather than alternatives, each having a special role.
New micrometeorological approaches are filling gaps in our measurement capabilities: less demanding mass balance techniques, new laser-based gas analysers, and convective boundary layer budget methods which permit estimates of trace gas fluxes on regional scales from relatively simple measurements