HR: 11:10h
AN: A32A-03    [Abstracts]
TI: Past and Future Changes in Biogenic Volatile Organic Compound Emissions Simulated with a Global Dynamic Vegetation Model
AU: * LATHIERE, J
EM: juliette.lathiere@cea.fr
AF: LSCE CEA/CNRS, l'Orme des Merisiers, bat 712, GIF-SUR-YVETTE, F-91191 France
AU: Hauglustaine, D
EM: didier.hauglustaine@cea.fr
AF: LSCE CEA/CNRS, l'Orme des Merisiers, bat 712, GIF-SUR-YVETTE, F-91191 France
AU: De Noblet-Ducoudre, N
EM: Nathalie.De-Noblet@cea.fr
AF: LSCE CEA/CNRS, l'Orme des Merisiers, bat 712, GIF-SUR-YVETTE, F-91191 France
AU: KRINNER, G
EM: gerhard@lgge.obs.ujf-grenoble.fr
AF: LGGE/CNRS, 54 rue MoliŠre DU BP 96, Saint-Martin d'Heres, 38402 France
AU: Folberth, G
EM: Gerd.Folberth@ec.gc.ca
AF: SEOS, University of Victoria, Victoria, BC V8W 2Y2 Canada
AB: The terrestrial biosphere is an essential component of the surface-atmosphere interactions, emitting highly reactive compounds such as isoprene, monoterpenes, methanol and other alcohols, acetone, or aldehydes, in the troposphere. Those volatile organic compounds (VOC) are strongly involved in tropospheric chemistry, and participate not only to gas phase reactions but also to particulate formation. Moreover, biogenic VOC emissions are very sensitive to environmental conditions (temperature, radiation, vegetation type) and could thus be significantly affected by climate and vegetation distribution changes. Based on the interactive global biogenic emission and dynamic vegetation model ORCHIDEE, we investigate the evolution of biogenic VOC emissions in four scenarios: the Last Glacial Maximum (21,000 years BP), the preindustrial (1850s), present-day (1990s) and the future (2100). The combined effects of foliar expansion, climate change and ecosystem redistribution has a large impact on biogenic emissions. We estimate that total biogenic VOC emissions increase from 331 TgC/yr at the LGM to 702 TgC/yr at the preindustrial, 725 TgC/yr at present-day and to 1251 TgC/yr under future conditions. Furthermore, it is important to notice that if the tropics remain a major source region, a substantial decrease in VOC emissions is calculated over Amazonia for 2100 due to the recession of tropical forests in response to climate change. The northern hemisphere becomes a significant source of VOC in the future and globally, emissions increase by 27% for isoprene and 51% for monoterpenes compared to the present.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0365 Troposphere: composition and chemistry
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 1610 Atmosphere (0315, 0325)
DE: 1632 Land cover change
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005