1. Vegetation Global chemical transport model study of effects of temperature on isoprene chemistry and emissions Akinori Ito My previous talk will be available at the ACPD web site.

2. iLEAPS Conference, Boulder, January 2006 Isoprene chemistry in a future atmosphere Paul Young, Guang Zeng & John Pyle Centre for Atmospheric Science, Cambridge University, UK

3. The effect of climate: CCE all – E all Increase temp → less PAN → increase O 3 PAN → NO x Surface ΔPAN / ppbv [JAN] Surface ΔO 3 / ppbv [JAN] Increase temp → more H 2 O decrease O 3 O3O3 O( 3 P) O 2 + M M O( 1 D) H2OH2O OH hνhν NOT THE WHOLE STORY!

4. O 3 increase/decrease? Regional… Paul Young et al. Isoprene chemistry in a future atmosphere NO x -limited regions VOC-limited regions Surface ΔO 3 / ppbv: E all – E others [JJA] Increasing isoprene in a HIGH (2090) NO x /VOC background

5. O 3 increase/decrease? Regional… Paul Young et al. Isoprene chemistry in a future atmosphere NO x -limited regions VOC-limited regions Surface ΔO 3 / ppbv: E iso – E BASE [JJA] Increasing isoprene in a LOW (2000) NO x /VOC background Isoprene swamps the more NO x - limited atmosphere