CESM Initial Conditions for the RCP4.5 and RCP8.5 Scenarios

[twglotfe@ncsu_edu]

I'm planning on doing a time slice simulation using CESM version 1.2.2 for the years 2045-2055 following both the RCP4.5 and RCP8.5 scenarios. The focus of this simulation is aerosols so I plan on using the STRATMAM7 fully coupled configuration similar to the B_RCP4.5_CAM5_CN component set. However, when I generated the case for this simulation the default initial conditions for each component are those shown below. These initial conditions are quite far removed in time from my period of interest (e.g., 2006 compared to 2045). Is there anywhere I can get initial condition files that better represent the time period and configuration I'm interested in? CAM IC: b.e10.B20TRC5CN.f09_g16.001.cam.i.2006-01-01-00000.ncCLM IC: b.e10.B20TRC5CN.f09_g16.001.clm2.r.2006-01-01-00000.ncCICE IC: b.e10.B20TRC5CN.f09_g16.001.cice.r.2006-01-01-00000.ncPOP2 IC: /glade/p/cesmdata/cseg/inputdata/ocn/pop/gx1v6/ic/ts_PHC2_jan_ic_gx1v6_20090205.ieeer8 Thanks,Tim Glotfelty

 

[strandwg]

We have the following CESM1-CAM5 restarts from RCP4.5 and RCP8.5 from the 2040s: b.e11.BRCP45C5CN.f09_g16.001 2046b.e11.BRCP45C5CN.f09_g16.002 2044b.e11.BRCP45C5CN.f09_g16.004 2044b.e11.BRCP85C5CN.f09_g16.001 2040b.e11.BRCP85C5CN.f09_g16.001 2047b.e11.BRCP85C5CN.f09_g16.002 2047b.e11.BRCP85C5CN.f09_g16.004 2042b.e11.BRCP85C5CN.f09_g16.004 2048Which one(s) would you like? 

 

[twglotfe@ncsu_edu]

I think the following three would be the best choices.b.e11.BRCP45C5CN.f09_g16.004 2044b.e11.BRCP85C5CN.f09_g16.004 2042b.e11.BRCP85C5CN.f09_g16.001 2047Thanks,Tim

 

[strandwg]

Please seeftp://ftp.cgd.ucar.edu/pub/strandwg/b.e11.BRCP45C5CN.f09_g16.004_2044.tarftp://ftp.cgd.ucar.edu/pub/strandwg/b.e11.BRCP85C5CN.f09_g16.001_2047.tarftp://ftp.cgd.ucar.edu/pub/strandwg/b.e11.BRCP85C5CN.f09_g16.004_2042.tar 

 

[twglotfe@ncsu_edu]

Thanks for the restart files. I ran a test simulation using the RCP4.5 file for the year 2045 but when I checked that top of the model radiative forcing the RESTOM is only 1.0 W m-2 instead of being somewhere between 3-4 W m-2 according to the scenario. At first I thought this might be because he greenhous gases didn't have initial conditions but I generated some from a WACCM simulation data from the Earth System Grid Website. I could only generate 3-D fields of CH4, O3, N2O, and CO2. There was no available data for CHC11 and CFC12. After I used these inital conditions the radiative forcing increased to 1.5 W m-2. Is there anyway to figure out if this is the result of using full chemistry, a problem with the configuration, or if I need to tune some of the cloud parameters?