Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
9
12
2009
10.5194/acp-9-4053-2009
http://www.atmos-chem-phys.net/9/4053/2009/
http://www.atmos-chem-phys.net/9/4053/2009/acp-9-4053-2009.html
http://www.atmos-chem-phys.net/9/4053/2009/acp-9-4053-2009.pdf
4053
4076
2009-06-19
Process based inventory of isoprenoid emissions from European forests: model comparisons, current knowledge and uncertainties
T. Keenan
t.keenan@creaf.uab.es
Ü. Niinemets
S. Sabate
C. Gracia
J. Peñuelas
CREAF, Autonomous University of Barcelona (UAB), 08193 Barcelona, Spain
Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia
Department of Ecology, University of Barcelona (UB), 08007 Barcelona, Spain
Global Ecology Unit CSIC-CEAB-CREAF, CREAF, Edifici C, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
Large uncertainties exist in our knowledge of regional emissions of
non-methane biogenic volatile organic compounds (BVOC). We address
these uncertainties through a two-pronged approach by compiling
a state of the art database of the emissions potentials for 80
European forest species, and by a model assessment and
inter-comparison, both at the local and regional scale, under present
and projected future climatic conditions. We coupled three contrasting
isoprenoid models with the ecophysiological forest model GOTILWA+ to
evaluate leaf and ecosystem isoprenoid emissions, build an emissions
inventory for European forests, and to consider model behaviour in
present climate and under projected future climate change conditions.
Hourly, daily and annual isoprene emissions
as simulated by the models were evaluated against flux
measurements. The validation highlighted a general model capacity to
capture gross fluxes but inefficiencies in capturing short term
variability. A regional inventory of isoprenoid emissions for
European forests was created using each of the three modelling
approaches. The models agreed on an average European emissions budget
of 1.03 TgC a<sup>−1</sup> for isoprene and 0.97 TgC a<sup>−1</sup>
for monoterpenes for the period 1960–1990, which was dominated by
a few species with largest aerial coverage. Species contribution to
total emissions depended both on species emission potential and
geographical distribution. For projected future climate conditions,
however, emissions budgets proved highly model dependent, illustrating
the current uncertainty associated with isoprenoid emissions responses
to potential future conditions.
<br><br>
These results suggest that current model estimates of isoprenoid
emissions concur well, but future estimates are highly uncertain. We
conclude that development of reliable models is highly urgent, but for
the time being, future BVOC emission scenario estimates should
consider results from an ensemble of available emission models.
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