The leaf-level emission factor of volatile isoprenoids : caveats, model algorithms, response shapes and scaling
Niinemets, Ülo (Eesti Maaülikool)
Monson, R. K. (University of Colorado. Department of Ecology and Evolutionary Biology)
Arneth, Almut (Lunds universitet. Institutionen för naturgeografi och ekosystemvetenskap)
Ciccioli, P. (Consiglio Nazionale delle Ricerche. Istituto di Metodologie Chimiche)
Kesselmeier, J. (Max-Planck-Institut für Chemie. Biogeochemistry Department)
Kuhn, U. (Forschungsanstalt Agroscope Reckenholz-Tänikon)
Noe, S. M. (Eesti Maaülikool)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Staudt, M. (Centre d'Ecologie Fonctionnelle et Evolutive)

Date:	2010
Abstract:	In models of plant volatile isoprenoid emissions, the instantaneous compound emission rate typically scales with the plant's emission potential under specified environmental conditions, also called as the emission factor, ES. In the most widely employed plant isoprenoid emission models, the algorithms developed by Guenther and colleagues (1991, 1993), instantaneous variation of the steady-state emission rate is described as the product of ES and light and temperature response functions. When these models are employed in the atmospheric chemistry modeling community, species-specific ES values and parameter values defining the instantaneous response curves are often taken as initially defined. In the current review, we argue that ES as a characteristic used in the models importantly depends on our understanding of which environmental factors affect isoprenoid emissions, and consequently need standardization during experimental ES determinations. In particular, there is now increasing consensus that in addition to variations in light and temperature, alterations in atmospheric and/or within-leaf CO₂ concentrations may need to be included in the emission models. Furthermore, we demonstrate that for less volatile isoprenoids, mono- and sesquiterpenes, the emissions are often jointly controlled by the compound synthesis and volatility. Because of these combined biochemical and physico-chemical drivers, specification of ES as a constant value is incapable of describing instantaneous emissions within the sole assumptions of fluctuating light and temperature as used in the standard algorithms. The definition of ES also varies depending on the degree of aggregation of ES values in different parameterization schemes (leaf- vs. canopy- or region-scale, species vs. plant functional type levels) and various aggregated ES schemes are not compatible for different integration models. The summarized information collectively emphasizes the need to update model algorithms by including missing environmental and physico-chemical controls, and always to define ES within the proper context of model structure and spatial and temporal resolution.
Grants:	Ministerio de Ciencia e Innovación CSD2008-00040 Ministerio de Ciencia e Innovación CGL2006-04025/BOS Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-458
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Biogeosciences, Vol. 7 Issue 6 (2010) , p. 1809-1832, ISSN 1726-4189

DOI: 10.5194/bg-7-1809-2010

24 p, 484.5 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles