Brief Description of IMAGE Ouput Files

The numbers in some files have to be multiplied by a factor to get the units as described below. These factors are given below. For example, the values in the files with the temperature of the growing season (files GROWST_xxxx.ASC) have to be multiplied by 0.1 to get the unit degree Celsius (so the unit of the values in the files are in 1/10th degrees).

Not all Computed Scenarios or IMAGE simulations produces all these output files. Certain models genrate a subset of these files. output files. Certain models only generate a subset of these files.

Filename             Description
==================== =============================================
DECRAT_xxxx.ASC      Effect of temperature and water availability 
		     on soil respiration.
                                     Unit: none (value 1: no effect)
                                     Multiplier: 0.001
D_PRC_xxxx.ASC       Change in precipitation relative to 1970.
                                     Unit: none
                                     Multiplier: 0.01
D_TMP_xxxx.ASC       Change in temperature since 1970.
                                     Unit: oC
                                     Multiplier: 0.1
FL_xxxx.ASC          Net carbon flux from the terrestrial biosphere 
                     to the atmosphere.
                                     Unit: ton C / km2 yr
GAMTOT_xxxx.ASC      Effect of temperature, soil water, species 
		     characteristics, nutrient availability and 
		     altitude on the CO2 fertilization effect.
                                     Unit: none (value 1: no effect)
                                     Multiplier: 0.001
GECH4BB_xxxx.ASC     Methane emissions from biomass burning.
                                     Unit: kg CH4 / km2 yr
GEN2OS_xxxx.ASC      Nitrous oxide emissions from natural soils.
                                     Unit: Kg N / km2 yr
GNPP_xxxx.ASC        Net primary production.
                                     Unit: g C / m2 yr  or ton C / km2 yr
                                     Multiplier: 0.001
GPPC_xxxx.ASC        Potential productivity for 8 crops.
                                     Unit: ton dry matter / ha
                                     Multiplier: 0.1
GROWSL_xxxx.ASC      Length of the growing season.
                                     Unit: days
GROWST_xxxx.ASC      Mean temperature of the growing season.
                                     Unit: oC
                                     Multiplier: 0.1
GVEG_xxxx.ASC        Land cover type.
                                     Unit: none
MOIST_xxxx.ASC       Moisture index.
                                     Unit: %
MTMP_xxxx.ASC        Mean monthly temperatures.
                                     Unit: oC
                                     Multiplier: 0.01
POTVEG_xxxx.ASC      Potential vegetation.
                                     Unit: none
PRECIP_xxxx.ASC      Annual precipitation.
                                     Unit: mm
SWS_xxxx.ASC         Soil water status.
                                     Unit: none
                                     Multiplier: 0.01
TMPEFF_xxxx.ASC      Temperature effect on photosynthetical rates.
                                     Unit: none (value 1: no effect)
                                     Multiplier: 0.001
=============================================================================

NOTES:

1) D_PRC_xxxx.ASC, D_TMP_xxxx.ASC

These files contain 5 values for each gridcell.

The different values are:

• Average over the months December, January and February (winter)
• Average over the months March, April and May (spring)
• Average over the months June, July and August (summer)
• Average over the months September, October and November (autumn)
• Yearly average

2) GPPC_xxxx.ASC

These file contains 8 values for each gridcell.

The different values are potential productivities for the following crops:

• Temperate cereals
• Rice
• Maize
• Tropical cereals
• Pulses
• Roots and tubers
• Oil crops
• Sugar crops

3) MTMP_xxxx.ASC, SWS_xxxx.ASC

These files contain 12 values for each gridcell.

The different values are monthly values (January to December).