Reproducibility of Control Run of CESM1 (CAM5) Large Ensemble Community Project

[gfang2@masonlive_gmu_edu]

Hello,I would like to use the large ensemble 1 degree Pre-industrial fully coupled control run of CESM1 (CAM5) Large Ensemble Community Project. http://www.cesm.ucar.edu/experiments/cesm1.1/LE/ However, first of all, I need to test its reproducibility, i.e., to make sure the outputs would be exactly the same. Does anyone know the intial condition of this control run?  Which model is it, cesm1_2_2? Is it okay to create the new case like this:./create_newcase -case ~/cases/B1850C5CN.f09_g16 -res f09_g16 -compset B_1850_CAM5_CN -mach yellowstoneIs there any other control run like 1 degree present day fully coupled CESM1 (CAM5) for about 100 years with restart files (B_2000_CAM5.f09_g16)? Where can I find it?Thanks

 

[jedwards]

Information regarding LENS is at https://www2.cesm.ucar.edu/models/experiments/LENS  

 

[jedwards]

Information regarding LENS is at https://www2.cesm.ucar.edu/models/experiments/LENS  

 

[gfang2@masonlive_gmu_edu]

The control run is supposed to be reproducible, isn't it? I plot the psl for the control run and my run (same compset and resolution, CESM1_2_2) but they are different. Do you know why?

 

[gfang2@masonlive_gmu_edu]

The control run is supposed to be reproducible, isn't it? I plot the psl for the control run and my run (same compset and resolution, CESM1_2_2) but they are different. Do you know why?

 

[hannay]

Two comments:- the large ensemble didn't use CESM1_2_2. You have to be very careful if you use a different tag. There is no garantuee it will produce the same climate (expect if this was specifically tested)- even if you use the same tag as the large ensemble, you will not necessary get the same answers because there might changes in the machine since the run was done. 
However, in this case, I would expect the climate to be the same. 

 

[hannay]

Two comments:- the large ensemble didn't use CESM1_2_2. You have to be very careful if you use a different tag. There is no garantuee it will produce the same climate (expect if this was specifically tested)- even if you use the same tag as the large ensemble, you will not necessary get the same answers because there might changes in the machine since the run was done. 
However, in this case, I would expect the climate to be the same. 

 

[nick_szapiro@ou_edu]

Hi,I'm trying to reproduce ~4 years of a CESM-LE member's integration (member 24 starting at the 2030 restart).
Using the code tag at /glade/p/cesmdata/cseg/collections/cesm1_1_2_LENS/, I get a slightly different state already within the first few days.Can anyone tell me the compilers, libraries,... used for the original integration to at least have a chance at getting identical integrations on Yellowstone?
I've asked a few people and was directed to ask in these forums.Thanks!
Nick

 

[nick_szapiro@ou_edu]

Hi,I'm trying to reproduce ~4 years of a CESM-LE member's integration (member 24 starting at the 2030 restart).
Using the code tag at /glade/p/cesmdata/cseg/collections/cesm1_1_2_LENS/, I get a slightly different state already within the first few days.Can anyone tell me the compilers, libraries,... used for the original integration to at least have a chance at getting identical integrations on Yellowstone?
I've asked a few people and was directed to ask in these forums.Thanks!
Nick