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The leaf-level emission factor of volatile isoprenoids: caveats, model algorithms, response shapes and scaling

Niinemets, Ü.; Monson, R. K.; Arneth, Almut LU ; Ciccioli, P.; Kesselmeier, J.; Kuhn, U.; Noe, S. M.; Peñuelas, J. and Staudt, M. (2010) In Biogeosciences 7(6). p.1809-1832
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biogeosciences
volume
7
issue
6
pages
1809 - 1832
publisher
Copernicus Publications
external identifiers
  • wos:000279390700001
  • scopus:77953094868
ISSN
1726-4189
DOI
10.5194/bg-7-1809-2010
project
MERGE
BECC
language
English
LU publication?
yes
id
51096ac0-6103-4bbc-ba76-58da225c5b84 (old id 4153351)
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http://www.biogeosciences.net/7/1809/2010/bg-7-1809-2010.pdf
http://www.biogeosciences.net/7/1809/2010/
date added to LUP
2013-11-14 12:51:33
date last changed
2018-05-29 09:35:02
@article{51096ac0-6103-4bbc-ba76-58da225c5b84,
  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.},
  author       = {Niinemets, Ü. and Monson, R. K. and Arneth, Almut and Ciccioli, P. and Kesselmeier, J. and Kuhn, U. and Noe, S. M. and Peñuelas, J. and Staudt, M.},
  issn         = {1726-4189},
  language     = {eng},
  number       = {6},
  pages        = {1809--1832},
  publisher    = {Copernicus Publications},
  series       = {Biogeosciences},
  title        = {The leaf-level emission factor of volatile isoprenoids: caveats, model algorithms, response shapes and scaling},
  url          = {http://dx.doi.org/10.5194/bg-7-1809-2010},
  volume       = {7},
  year         = {2010},
}