Brief description of the modifications done into LPJ module

Evaluation of this new version

For all the simulations that have been tested, we use a simulation performed with V1.6 and provided by Nathalie De Noblet. They all run 200 years using a climatology from CRU (monthly data) provided by Nathalie as well. We first ensure that we were capable to re-do the simulation performed by Nathalie. Below is the PFT distribution of natural vegetation (one PFT per column) for the simulation performed by Nathalie (upper panel), and our simulation (middle panel) and the difference between the two (lower panel).

We then ran a simulation with the tag 1.9.5.1, to check how ORCHIDEE was performing before changes. Here below is a comparison with the simulation provided by Nathalie. The main changes are :

• The high latitudes are defined as 100% noBio fraction.
• Increase of the fraction of Bare Soil in Central Asia at the expense of Grass PFT.
• Extension of the Tropical PFT zone in Africa at the expense of C3 and C4 grass PFT.
• Extension of the zone occupied by 'Temperate broad-leaved summergreen' (but with low fraction).
• Change in the fractions occupied by Boreal PFT.

Last, we evaluate how performs the version of ORCHIDEE updated for LPJ module.