Emission of Reactive Terpene Compounds from Orange Orchards and their Removal by within-Canopy Processes.

VOC emission from an orange field was measured in the frame of two field campaign carried out in Burriana (Spain) during the summer and spring season. The potential emission fluxes were scaled from enclosing the major emission sources, i.e. branches and soils of different orange varieties present in the fetch seen by micrometeorological measurements. Concurrentlyl the real fluxes of biogenicc VOC above the orange orchard were determined by relaxed eddy accumulation. A comparisonbetween emission rates and fluxes indicate that substantial removal of b-caryophyllene and linalool occurred during transport of orange emission from the canopy into the atmospheric boundary layer. While within-canopy removal of the sesquiterpene component is fully consistent with laboratory studies indicating high reactivity toward OH radicals and ozone, linalool losses are more difficult to explain. Although high fluxes of acetone suggest linalool decomposition by gas-phase reactivity, removal by heterogeneous chemistry and/or deposition cannot be ruled out.

CICCIOLI Paolo;  BRANCALEONI E.;  FRATTONI Massimiliano;  DI PALO V.;  VALENTINI Riccardo;  TIRONE Giampiero;  SEUFERT Guenther;  BERTIN Nadia;  HANSEN Ute;  CSIKY Olav;  LENZ Roman;  SHARMA Meeta; 

1998-05-04

JRC16246

https://publications.jrc.ec.europa.eu/repository/handle/JRC16246,