Title European emissions of isoprene and monoterpenes from the last glacial maximum to present
Author Schurgers, G.; Hickler, T.; Miller, P.A.; Arneth, A.
Author Affil Schurgers, G., Lund University, Department of Physical Geography and Ecosystems Analysis, Lund, Sweden. Other: University of Helsinki, Finland
Source Biogeosciences, 6(12), p.2779-2797, . Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726- 4170
Publication Date 2009
Notes In English. Includes appendices; published in Biogeosciences Discussions: 3 September 2009, http://www.biogeosciences- discuss.net/6/8805/2009/bgd-6-8805-2009.html; accessed in March, 2011; abstract: doi:10.5194/bg-6-2779-2009. 105 refs. GeoRef Acc. No: 310493
Index Terms climatic change; models; ozone; paleoclimatology; photosynthesis; trees (plants); vegetation; Europe; atmospheric transport; biogenic processes; carbon dioxide; Cenozoic; climate change; glacial environment; Holocene; interglacial environment; isoprenoids; last glacial maximum; LPJ-GUESS; monterpenes; organic compounds; paleotemperature; photochemistry; physiology; Quaternary; seasonal variations; transport; trees
Abstract Biogenic volatile organic compounds (BVOC), such as isoprene and monoterpenes, play an important role in atmospheric processes. BVOC species are oxidized in the atmosphere and influence levels of ozone. The less volatile amongst the BVOC and their oxidation products are important for the formation and growth of secondary biogenic aerosol. In this way, the Earth's radiation balance is affected. Geographic distribution and temporal changes in BVOC emissions are highly uncertain. Here we assessed changes in emission patterns across Europe since the Last Glacial Maximum (LGM) with a dynamic vegetation model. This model reproduces European tree species distribution and includes a process-based algorithm for terpenoid production. In a set of simulations the model was driven with paleoclimate anomalies and reconstructed CO2 concentrations. We quantified three main driving factors for the changes in emissions of isoprene and monoterpenes since the LGM: (1) the changes in climate, with temperature changes as the most important factor affecting plant physiology and terpenoid production in all plant species, (2) a change in species distribution related to the changes in climate, causing local shifts in emission characteristics of the vegetation, and (3) a change in CO2 concentration, causing opposing effects on the availability of different substrates for terpenoid production. The effect of atmospheric CO2 concentration is particularly uncertain, but sensitivity simulations showed an increase in European BVOC emissions in all sensitivity experiments irrespective of the use of a direct inhibition of terpenoid production by CO2. The effects of climate change on physiology and terpenoid production resulted in an overall relatively uniform increase of emissions in Europe over the simulation period, but regionally the effect of changes in species distribution and the related changes in emission capacities resulted in changes of emissions that can dominate over the physiology effects. This may have consequences for regional atmospheric chemistry simulations for the past, that have to rely on suitable geographic patterns of forest emissions.
URL http://www.biogeosciences.net/6/2779/2009/bg-6-2779-2009.pdf
Publication Type journal article
Record ID 65007108