AN034: Simultaneous soil flux measurements of five gases -- N2O, CH4, CO2, NH3, and H2O -- with the Picarro G2508

AN034: Simultaneous soil flux measurements of five gases -- N2O, CH4, CO2, NH3, and H2O -- with the Picarro G2508

Picarro has developed a new analyzer capable of simultaneously measuring five gases: N2O, CH4, CO2, NH3, and H2O. This paper demonstrates the ability of this analyzer to measure soil fluxes when connected to a static chamber as part of a closed system.

Abstract: 

Picarro has developed a new analyzer capable of simultaneously measuring five gases: N2O, CH4, CO2, NH3, and H2O. This paper demonstrates the ability of this analyzer to measure soil fluxes when connected to a static chamber as part of a closed system. The experiments took place in a laboratory on a soil sample. The first set of chamber tests on dry soil were designed to demonstrate repeatability and showed rate-of-rise variation that was comparableto the standard error calculated for the slopes. The system was able to measure a CH4 rate-of-rise of 0.17 ppb/min with a 1σ uncertainty of +/- 0.016 ppb/minThe second set of tests simulated a rain event. Following the addition of water to the soil, the flux rates showed quitedifferent trends for each of the measured gases. N2O emission rate triples immediately and continues to rise over the next hour. CH4 emission immediately spiked, but then decreased toward the emission rates of the dry soil. CO2 emission was initially suppressed but recovered by the end of 2 hours. NH3 and water vapor content increased. The new Picarro G2508 analyzer was able to provide repeatable, statistically significant soil flux rate-of-rise measurements for N2O, CH4, CO2, NH3, and H2O.