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Regarding NCAR-CCSM3 and NCAR-PCM1 1% to 2x CO2

Respected Sir,
Regarding 1%/yr co2 increase experiment (to doubling), I would like to know the year
at which the model is started (even though the model is considered nominal time scale)
and for that particular year what is the initial value of co2 at that particular level.
i.e what is co2 concentration value fixed at initial year and the the same for the
doubling co2 too. Can you give me information of co2 value and starting year before
doubling and after doubling of co2. Awaiting for ur reply
 
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