Syntax:
START_CONCENTRATION [eeeeee|PREVIOUS]
Where eeeeee is a floating point number that gives a global universal concentration in parts per billion by volume (ppbv). 1 ppb indicates that one per 1x109 air molecules is the concentration of the tracer.
The option PREVIOUS can be used to read in the tracer filed of the previous run. This allows longer runs, and can be used to initialize tracer fields.
First run (to generate an initial tracer distribution, without generating output):
TITLE test1
NAME Rn
MOLMASS 222.0
START_DATE 19911201
END_DATE 19920101
EMISSION LAND 1.0
LIFE_TIME 5.5
START_CONCENTRATION 0.0
END
Second run (to use the previously generated distribution and generate output):
TITLE test2
NAME Rn
MOLMASS 222.0
START_DATE 19920101
END_DATE 19930101
EMISSION LAND 1.0
LIFE_TIME 5.5
START_CONCENTRATION PREVIOUS
OUTPUT MONTHLY LATLON 1000HPA
END
Default:
START_CONCENTRATION 0.0