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1. Create a new case/build a new executable. I recommend using the "run_acme.csh" style script that Peter Caldwell and Philip Cameron-Smith (Unlicensed) created for this:
   
   1. git clone https://github.com/ACME-Climate/SimulationScripts.git,
   2. cd SimulationScripts/serving_as_a_template/recommended,
   3. modify run_acme.template.csh as needed
      
      1. replace "template" in name with better descriptor,
      2. copy file to non-git directory (if desired)
      3. change stuff in file as needed. I can't say what you will want to change since each simulation is different, but at least think about:
         
         1. change run_name
         2. in particular, change "submit_run" to false so you can set the code up for a restart before submitting it
         3. Change run length/restart freq/output freq. By default the code you just downloaded runs 5 days with daily atm output, then stops without writing any restart files.
   4. execute run_acme...csh and make sure it completes without errors
2. Copy restart files from previous run to ${run_root_dir}/run where ${run_root_dir} is the root directory where your run will occur (which will have subdirectories called run, case_scripts, build, etc)
   
   1. I wrote a script called cp_continue_run.sh to do this (based on input by Chris Golaz). It is also in the git repo from step 1b under subdirectory SimulationScripts/serving_as_a_template/recommended/. In cp_continue_run.sh:
      
      1. change TIME1 to the day you want to restart from
      2. change TIME2 to the month before the day you want to restart on
      3. set the CASE to the name of the case you want to use ***Note that for simplicity I'm assuming the name of the case you're branching from is the same as the case you want to continue from. We should generalize this in the futureAttempts to change the casename have always failed - apparently changing the file names of the restart files you want to use to reflect the new run directory is not enough ***
      4. INDIR is the absolute path to the restart files you want to copy
      5. OUTDIR is the absolute path to ${run_root_dir}/run.
   2. Execute cp_continue_run.sh and make sure the copied files exist in ${run_root_dir}/run as expected.
3. Change each of the rpointer files in ${run_root_dir}/run to reflect a consistent desired start date (if they don't already)
4. Change CONTINUE_RUN to TRUE in ${run_root_dir}/case_scripts/env_run.xml
5. Submit the run by typing "./$CASE.submit" (where $CASE is the name of your case) in subdirectory ${run_root_dir}/case_scripts/