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CCSM4 CMIP5 historical runs r1i1p1 r1i2p1 r1i2p2 r2i1p1 r6i1p1

M

mfwehner@lbl_gov

Member
I would like to know the difference between these CCSM4 historical runs r1i1p1  r1i2p1  r1i2p2  r2i1p1  r6i1p1

clearly r1i1p1   r2i1p1  r6i1p1 are a three member ensemble with different initial conditions. r1i2p1 is the same physics but something else. I thought i2 was reserved for differences in decadal predictability runs. r1i2p2 is something different again with different physics. What is that? Can someone explain how i2 and p2 differ from i1 and p1 for CCSM4? ThanksMichael 
 
S

strandwg

Moderator
Staff member
The original casename for CCSM4_historical_r1i2p1 is b40.lm1850-2005.1deg.001, which was branched from the past1000 run (b40.lm850-1850.1deg.001) at 1850 as opposed to the piControl (b40.1850.track1.1deg.006) so that's why the "i2" (different initial condition).CCSM4_historical_r1i2p2 is b40.lm1850-2005.1deg.002, also branched from the past1000 run (b40.lm850-1850.1deg.001) at 1850, but with "annual orbital forcing", according to the old CSEG web pages. Therefore the "i2" and "p2" instead of "p1". 
 
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