Pj. Walklate et al., A NEW GAS INJECTION METHOD TO ENHANCE SPATIAL UTILIZATION WITHIN A FREE-AIR CO2 ENRICHMENT (FACE) SYSTEM, Global change biology, 2(1), 1996, pp. 75-78
Visual observations of smoke dispersion in a wind tunnel and a computa
tional fluid dynamics (CFD) model were used to evaluate methods of imp
roving the performance of Free-Air CO2 Enrichment (FACE) Systems for f
ield studies of the effects of elevated CO2 on vegetation. A special b
affle, named an Enhanced Local Mixing (ELM) system, was observed to in
crease the turbulence and consequent dilution of fumigant gas in the a
tmosphere. Modelling results suggest that the ELM design reduces the s
patial variation of fumigant gas concentration in small experimental p
lots. The potential reduction in CO2 use and costs warrants further ev
aluation under field conditions.