Global terrestrial isoprene emission models: sensitivity to variability in climate and vegetation
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2162188
- author
- Arneth, Almut LU ; Schurgers, Guy LU ; Lathiere, J. ; Duhl, T. ; Beerling, D. J. ; Hewitt, C. N. ; Martin, Marion LU and Guenther, A.
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Atmospheric Chemistry and Physics
- volume
- 11
- issue
- 15
- pages
- 8037 - 8052
- publisher
- Copernicus GmbH
- external identifiers
-
- wos:000293826500038
- scopus:80051610563
- ISSN
- 1680-7324
- DOI
- 10.5194/acp-11-8037-2011
- language
- English
- LU publication?
- yes
- id
- a56fa7cf-a649-4a5c-96a4-0aa5ea30ff24 (old id 2162188)
- date added to LUP
- 2016-04-01 10:02:52
- date last changed
- 2022-04-27 18:02:53
@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 GmbH}},
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}},
doi = {{10.5194/acp-11-8037-2011}},
volume = {{11}},
year = {{2011}},
}