Table 5.

Sensitivity of emissions, concentration and deposition in the bi-directional ammonia system to a 50 per cent increase in the soil gamma, a 50 per cent increase in the fertilization rate and parametrizing the apoplast gamma as a function of the annual nitrogen deposition and fertilizer application following Massad et al. [34].

sensitivity of the bi-directional ammonia system June 2006 continental domain
	50% increase in soil gamma	50% increase in crop fertilization	Massad et al. [34] appoplast gamma
	relative change (%)	relative change (%)	relative change (%)
fertilizer emissions	42.3	31.0	17.5
total NH3 emissions	11.8	8.6	4.9
NH3 air concentration	9.3	6.8	3.2
NH4+ air concentration	0.7	0.4	0.9
Red-N dry deposition	11.4	8.5	4.1
Red-N wet deposition	7.7	5.2	3.5
Red-N total deposition	8.9	6.3	3.7
Total N deposition	3.8	2.6	1.6