HR: 16:00h
AN: A54B-01 INVITED    [Abstracts]
TI: Interannual to millennial variation of biogenic ozone and aerosol precursor emissions
AU: * Arneth, A
EM: almut.arneth@nateko.lu.se
AF: Department of Physical Geography and Ecosystem Analysis, Lund University, Solvegatan 12, Lund, 22362, Sweden
AU: Schurgers, G
EM: guy.schurgers@nateko.lu.se
AF: Department of Physical Geography and Ecosystem Analysis, Lund University, Solvegatan 12, Lund, 22362, Sweden
AU: Olofsson, J
EM: jorgen.olofsson@nateko.lu.se
AF: Department of Physical Geography and Ecosystem Analysis, Lund University, Solvegatan 12, Lund, 22362, Sweden
AU: Miller, P
EM: paul.miller@nateko.lu.se
AF: Department of Physical Geography and Ecosystem Analysis, Lund University, Solvegatan 12, Lund, 22362, Sweden
AU: Hickler, T
EM: thomas.hickler@nateko.lu.se
AF: Department of Physical Geography and Ecosystem Analysis, Lund University, Solvegatan 12, Lund, 22362, Sweden
AB: Biogenic volatile organic compounds (BVOC), particularly isoprene and monoterpenes are important precursors for the formation of tropospheric ozone and secondary organic aerosol. But the amount and regional distribution of their emissions are poorly known which makes them one of the chief sources of uncertainty in atmospheric chemistry-climate models. What is more, a number of processes have emerged over recent years that need to be taken into account in simulation experiments and that previously have not been accounted for in global emission estimates. To investigate the transient responses of isoprene and monoterpene emissions over time-scales from inter- annual to millennia BVOC algorithms have to be coupled into dynamic global vegetation models (DGVM) to account for variation in vegetation productivity, phenology and leaf area index as important controls on BVOC emissions. We will present here analyses of isoprene and monoterpene emissions in response to variation in climate and atmospheric CO2 concentration concentrating using a process-based BVOC algorithm within the DGVM framework LPJ-GUESS. The model accounts for the CO2-inhibition of leaf isoprene and monoterpene production. Our analysis concentrates specifically on emission variation over (i) the last two decades and (ii) from the mid- Holocene to the pre-industrial period. These analyses provide novel insight of emission responses to short-term fluctuations in climate, long term trends in climate and atmospheric CO2 concentration and of early human deforestation associated with establishment of agriculture.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 1615 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 4805, 4912)
DE: 1622 Earth system modeling (1225)
DE: 1631 Land/atmosphere interactions (1218, 1843, 3322)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting