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We use the Kapuni Gas Treatment Plant to examine methodologies foratmospheric monitoring of point source fossil fuel CO2 (CO2ff)emissions. The Kapuni plant, located in rural New Zealand, removes CO2from locally extracted natural gas and vents that CO2 to theatmosphere, at a rate of ~0.1 Tg carbon per year. The plantis located in a rural dairy farming area, with no other significantCO2ff sources nearby, but large, diurnally varying, biospheric CO2fluxes from the surrounding highly productive agricultural grassland. Wemade flask measurements of CO2 and 14CO2 (from which wederive the CO2ff component) and in situ measurements of CO2downwind of the Kapuni plant, using a Helikite to sample transects acrossthe emission plume from the surface up to 100 m above ground level. We alsodetermined the surface CO2ff content averaged over several weeks fromthe 14C content of grass samples collected from the surrounding area.We use the WindTrax plume dispersion model to compare the atmosphericobservations with the emissions reported by the Kapuni plant, and todetermine how well atmospheric measurements can constrain the emissions. Themodel has difficulty accurately capturing the fluctuations and short-termvariability in the Helikite samples, but does quite well in representing theobserved CO2ff in 15 min averaged surface flask samples and in ~ one week integrated CO2ff averages from grass samples.In this pilot study, we found that using grass samples, the modeled andobserved CO2ff emissions averaged over one week agreed to within 30%. The results imply that greater verification accuracy may be achievedby including more detailed meteorological observations and refining 14Csampling strategies

Atmospheric measurement of point source fossil CO&lt;sub&gt;2&lt;/sub&gt; emissions

Atmospheric measurement of point source fossil CO<sub>2</sub> emissions