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Global terrestrial isoprene emission models: sensitivity to variability in climate and vegetation

Arneth, Almut LU ; Schurgers, Guy LU ; Lathiere, J.; Duhl, T.; Beerling, D. J.; Hewitt, C. N.; Martin, Marion LU and Guenther, A. (2011) In Atmospheric Chemistry and Physics 11(15). p.8037-8052
Abstract
Due to its effects on the atmospheric lifetime of methane, the burdens of tropospheric ozone and growth of secondary organic aerosol, isoprene is central among the biogenic compounds that need to be taken into account for assessment of anthropogenic air pollution-climate change interactions. Lack of process-understanding regarding leaf isoprene production as well as of suitable observations to constrain and evaluate regional or global simulation results add large uncertainties to past, present and future emissions estimates. Focusing on contemporary climate conditions, we compare three global isoprene models that differ in their representation of vegetation and isoprene emission algorithm. We specifically aim to investigate the between-and... (More)
Due to its effects on the atmospheric lifetime of methane, the burdens of tropospheric ozone and growth of secondary organic aerosol, isoprene is central among the biogenic compounds that need to be taken into account for assessment of anthropogenic air pollution-climate change interactions. Lack of process-understanding regarding leaf isoprene production as well as of suitable observations to constrain and evaluate regional or global simulation results add large uncertainties to past, present and future emissions estimates. Focusing on contemporary climate conditions, we compare three global isoprene models that differ in their representation of vegetation and isoprene emission algorithm. We specifically aim to investigate the between-and within model variation that is introduced by varying some of the models' main features, and to determine which spatial and/or temporal features are robust between models and different experimental set-ups. In their individual standard configurations, the models broadly agree with respect to the chief isoprene sources and emission seasonality, with maximum monthly emission rates around 20-25 Tg C, when averaged by 30-degree latitudinal bands. They also indicate relatively small (approximately 5 to 10% around the mean) interannual variability of total global emissions. The models are sensitive to changes in one or more of their main model components and drivers (e. g., underlying vegetation fields, climate input) which can yield increases or decreases in total annual emissions of cumulatively by more than 30 %. Varying drivers also strongly alters the seasonal emission pattern. The variable response needs to be interpreted in view of the vegetation emission capacities, as well as diverging absolute and regional distribution of light, radiation and temperature, but the direction of the simulated emission changes was not as uniform as anticipated. Our results highlight the need for modellers to evaluate their implementations of isoprene emission models carefully when performing simulations that use nonstandard emission model configurations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
11
issue
15
pages
8037 - 8052
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • wos:000293826500038
  • scopus:80051610563
ISSN
1680-7324
DOI
10.5194/acp-11-8037-2011
project
MERGE
BECC
language
English
LU publication?
yes
id
a56fa7cf-a649-4a5c-96a4-0aa5ea30ff24 (old id 2162188)
date added to LUP
2011-09-21 09:00:53
date last changed
2017-10-29 03:04:31
@article{a56fa7cf-a649-4a5c-96a4-0aa5ea30ff24,
  abstract     = {Due to its effects on the atmospheric lifetime of methane, the burdens of tropospheric ozone and growth of secondary organic aerosol, isoprene is central among the biogenic compounds that need to be taken into account for assessment of anthropogenic air pollution-climate change interactions. Lack of process-understanding regarding leaf isoprene production as well as of suitable observations to constrain and evaluate regional or global simulation results add large uncertainties to past, present and future emissions estimates. Focusing on contemporary climate conditions, we compare three global isoprene models that differ in their representation of vegetation and isoprene emission algorithm. We specifically aim to investigate the between-and within model variation that is introduced by varying some of the models' main features, and to determine which spatial and/or temporal features are robust between models and different experimental set-ups. In their individual standard configurations, the models broadly agree with respect to the chief isoprene sources and emission seasonality, with maximum monthly emission rates around 20-25 Tg C, when averaged by 30-degree latitudinal bands. They also indicate relatively small (approximately 5 to 10% around the mean) interannual variability of total global emissions. The models are sensitive to changes in one or more of their main model components and drivers (e. g., underlying vegetation fields, climate input) which can yield increases or decreases in total annual emissions of cumulatively by more than 30 %. Varying drivers also strongly alters the seasonal emission pattern. The variable response needs to be interpreted in view of the vegetation emission capacities, as well as diverging absolute and regional distribution of light, radiation and temperature, but the direction of the simulated emission changes was not as uniform as anticipated. Our results highlight the need for modellers to evaluate their implementations of isoprene emission models carefully when performing simulations that use nonstandard emission model configurations.},
  author       = {Arneth, Almut and Schurgers, Guy and Lathiere, J. and Duhl, T. and Beerling, D. J. and Hewitt, C. N. and Martin, Marion and Guenther, A.},
  issn         = {1680-7324},
  language     = {eng},
  number       = {15},
  pages        = {8037--8052},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Global terrestrial isoprene emission models: sensitivity to variability in climate and vegetation},
  url          = {http://dx.doi.org/10.5194/acp-11-8037-2011},
  volume       = {11},
  year         = {2011},
}