Vegetation

Global chemical transport model study of effects of temperature on

isoprene chemistry and emissionsAkinori Ito

My previous talk will be available at the ACPD web site.

iLEAPS Conference, Boulder, January 2006

Isoprene chemistry in a future atmospherePaul Young, Guang Zeng & John Pyle

Centre for Atmospheric Science, Cambridge University, UK

The effect of climate: CCEall – Eall

Increase temp → less PAN → increase O3

PAN → NOx

Surface ΔPAN / ppbv [JAN]

Surface ΔO3 / ppbv [JAN]

Increase temp → more H2O decrease O3

O3

O(3P)

O2 + M

M

O(1D)H2O

OH

hν

NOT THE WHOLE STORY!

O3 increase/decrease? Regional…

Paul Young et al. Isoprene chemistry in a future atmosphere

NOx-limited regions

VOC-limited regions

Surface ΔO3 / ppbv: Eall – Eothers [JJA]

Increasing isoprene in a HIGH (2090) NOx/VOC background

O3 increase/decrease? Regional…

Paul Young et al. Isoprene chemistry in a future atmosphere

NOx-limited regions

VOC-limited regions

Surface ΔO3 / ppbv: Eiso – EBASE [JJA]

Increasing isoprene in a LOW (2000) NOx/VOC background

Isoprene swamps the more NOx-limited atmosphere