Global BVOC Emission Inventories: A focus on the Southeastern US. Colette L. Heald. Are biogenic emission models sufficient to describe BVOC and oVOC emissions in forested areas, suburban areas, urban areas?. SOAS Workshop May 25, 2011. THE SOUTHEAST IS THE LUSHEST REGION IN THE US.
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A focus on the Southeastern US
Colette L. Heald
Are biogenic emission models sufficient to describe BVOC and oVOC emissions in forested areas, suburban areas, urban areas?
May 25, 2011
Leaf Area Index (LAI)
Baseline emission factors (for some species?) relatively well characterized in the SE…
(I defer to Alex and others…)
[Guenther et al., 2006]
% vegetation cover
Baseline Isoprene Emission Factor
Large uncertainties in BVOC emissions result.
More important than spatial resolution??
Fraction of US BVOC emitted in the SE: ~25% of isoprene, ~15% of MT, ~10% SQ, ~25% oVOC
Fluxes measured at the top of the canopy are NET
Risk that models are effectively double-counting deposition?
Larger issue of evaluating simulated deposition...
And possibly implications of oVOC deposition
Anthropogenic land use change is largely the invasion of croplands. In the W US this is at the expense of grasslands, but in the E US also at the expense of trees.
BVOC emissions will decrease in the SE.
Isoprene emissions from oil palm (basal EF: 7.8 mg/m2/h) are 4-8 times the fluxes at a Borneo rainforest.
Also saw higher estragole and lower monoterpenes.
Pictures courtesy: Nick Hewitt
Same land model (CLM) driven by 8 different climate projections
[Alo and Wang, 2008]
Some key questions:
1. Increase/decrease in precip?
2. How efficient is carbon fertilization?