Seasonality of monoterpene emission potentials in Quercus ilex and Pinus pinea : implications for regional VOC emissions modeling
Keenan, Trevor F. (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Niinemets, Ülo (Eesti Maaülikool. Institut of Agricultural and Environmental Sciences)
Sabaté i Jorba, Santi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Gracia, Carles (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)

Fecha:	2009
Resumen:	VOC emissions from terrestrial ecosystems provide one of the principal controls over oxidative photochemistry in the lower atmosphere and the resulting air pollution. Such atmospheric processes have strong seasonal cycles. Although similar seasonal cycles in VOC emissions from terrestrial ecosystems have been reported, regional emissions inventories generally omit the effect of seasonality on emissions. We compiled measurement data on seasonal variations in monoterpene emissions potentials for two evergreen species (Quercus ilex and Pinus pinea) and used these data to construct two contrasting seasonal response functions for the inclusion in monoterpene emission models. We included these responses in the Niinemets et al. model and compared simulation results to those of the MEGAN model, both with and without its predicted seasonality. The effect of seasonality on regional monoterpene emissions inventories for European Mediterranean forests dominated by these species was tested for both models, using the GOTILWA+ biosphere model platform. The consideration of seasonality in the Niinemets et al. model reduced total estimated annual monoterpene emissions by up to 65% in some regions, with largest reductions at lower latitudes. The MEGAN model demonstrated a much weaker seasonal response than that in the Niinemets et al. model, and did not capture the between species seasonality differences found in this study. Results suggest that previous regional model inventories based on one fixed emission factor likely overestimate regional emissions, and species-specific expressions of seasonality may be necessary. The consideration of seasonality both largely reduces monoterpene emissions estimates, and changes their expected seasonal distribution.
Ayudas:	European Commission 00075 European Commission 506675 European Commission 512464 European Commission 212535 Ministerio de Educación y Ciencia CGL2006-04025 Ministerio de Ciencia e Innovación CSD2008-00040 Agència de Gestió d'Ajuts Universitaris i de Recerca 2005/SGR-00312
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Monoterpene emission ; Regional VOC emission
Publicado en:	Journal of geophysical research : atmospheres, Vol. 114 Issue D22 (Nov. 2009) , p. D22202, ISSN 2169-897X

DOI: 10.1029/2009JD011904
DOI: 10.1029/2009JDO11904

11 p, 390.6 KB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
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