1. HYMN Work Package 2: BIOSPHERE-ATMOSPHERE INTERACTIONS Colin Prentice (Leader)QUEST Rita Wania (PhD candidate)HYMN Renato Spahni (Visiting Fellow)Swiss NSF Leilei Dong (Researcher) HYMN/NERC Pru Foster (Coordinator)HYMN/QUEST Goal: LPJ to model emissions and uptake of the major reactive trace gases => benchmark via CTMs and trace gas measurements (analogous to TMs and CO 2 measurements) Work Package 2

2. New lpj

3. references references

4. Work Plan Benchmark LPJ-WHyMe Change soil layering to speed up computation Add in SPITFIRE (with carbon isotopes) Add in LPJ-DyN Add in VOCs and hydrogen modules “Structurally complete” version by Feb 2008 Benchmark new merged version (iteration with CTMs) => operational version by end 2008

5. Comments NitroEurope’s 3rd Annual meeting (Feb 18-21, 2008 Het Pand, Gent) Contact with Eurohydros (E. Nisbet) Synergy with other LPJ developments in Bristol, especially fire/vegetation interactions Inventory approach for minor trace gases, ?agricultural sources (e.g. CH 4 from rice) Disregard plant source of CH 4 ? Stable isotope modelling?? 13 CH 4 and CH 3 D 15 N 2 O and N 2 18 O DH