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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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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



Biogenic voc emissions megan v2
BIOGENIC VOC EMISSIONS: MEGAN v2

  • εi is the emission factor at standard conditions for vegetation type i

  • χi, fractional areal coverage

  • the emission activity factor

  •  is the canopy loss and production factor

E=f( )

Baseline emission factors (for some species?) relatively well characterized in the SE…

(I defer to Alex and others…)

[Guenther et al., 2006]



How does uncertainty in land cover translate to uncertainty in emissions
HOW DOES UNCERTAINTY IN LAND COVER TRANSLATE TO UNCERTAINTY IN EMISSIONS?

CLM

Guenther

CLM-Guenther

% vegetation cover

Baseline Isoprene Emission Factor

Large uncertainties in BVOC emissions result.

More important than spatial resolution??


Bvoc emissions in the eastern us megan v2 in clm
BVOC EMISSIONS IN THE EASTERN US: MEGAN v2 in CLM IN EMISSIONS?

6.8 Tg/yr

0.6 Tg/yr

0.14 Tg/yr

3.2 Tg/yr

Fraction of US BVOC emitted in the SE: ~25% of isoprene, ~15% of MT, ~10% SQ, ~25% oVOC


What about bi directional flux of ovocs
WHAT ABOUT BI-DIRECTIONAL FLUX OF oVOCs? IN EMISSIONS?

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


Future anthropogenic land use change in the se
FUTURE ANTHROPOGENIC LAND USE CHANGE IN THE SE IN EMISSIONS?

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.


What about plantation species in the southeast
WHAT ABOUT PLANTATION SPECIES IN THE SOUTHEAST? IN EMISSIONS?

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


Natural land use change also highly uncertain
NATURAL LAND USE CHANGE ALSO HIGHLY UNCERTAIN IN EMISSIONS?

LAI (2100-2000)

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?


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