Merge OCN

This page describes the work done to include the nitrogen cycle into ORCHIDEE. The nitrogen cycle was introduced into ORCHIDEE by Sonke Zaehle a few years ago. This version called O-CN was not parallelized and is based on a obsolete version, so it will be progressively merged into a copy of trunk of ORCHIDEE with regular updates (synchronization with the trunk). The release is expected for the end of 2013.

Preliminary work : add extra dimensions for some carbon variables (October 2012)

Work done by Didier : the following variables (global) have now an extra dimension :

    turnover daily
    turnover_littercalc
    turnover_longterm
    biomass
    litter
    bm_to_litter
    bm_to_littercalc
    bm_sapl (parameter)
    bm_alloc

Some local variables need an extra dimension too :

lpj_cover	dilu_lit
lpj_establish	total_bm_sapl
stomate_lcchange	bm_new, biomass_loss, dilu_lit
stomate_litter	qd, litter_inc_PFT, litter_inc, litter_pft
stomate_lpj	tot_bm_to_litter, tot_live_biomass, bm_alloc, tot_turnover
stomate_soilcarbon	fluxtot, flux

Moreover, I need to add the following parameters :

INTEGER(i_std), PARAMETER :: nelements = 1    !! Number of isotopes considered 
INTEGER(i_std), PARAMETER :: icarbon = 1      !! Index for carbon  

Test done : A simple binary comparison test was performed on Obelix. The tests are OK.

This work has been commited see [1025].