Abstract. A field study was undertaken to investigate the accuracy of two
micrometeorological flux footprint models for calculating the gas emission
rate from a synthetic 10 × 10 m surface area source, based on the vertical
flux of gas measured at fetches of 15 to 50 m downwind of the source.
Calculations were made with an easy-to-use tool based on the Kormann–Meixner
analytical model and with a more sophisticated Lagrangian stochastic
dispersion model. A total of 59 testable 10 min observation periods were
measured over 9 d. On average, both models underestimated the actual
release rate by approximately 30 %, mostly due to large underestimates at
the larger fetches. The accuracy of the model calculations had large
period-to-period variability, and no statistical differences were observed
between the two models in terms of overall accuracy.
A Compilation of Gas Emission-Rate Data from Volcanoes of Cook Inlet (Spurr, Crater Peak, Redoubt, Iliamna, and Augustine) and Alaska Peninsula (Douglas, Fourpeaked, Griggs, Mageik, Martin, Peulik, Ukinrek Maars, and Veniaminof), Alaska, from 1995-2006
