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    :caption: Content
 
    get.md
+   spinup.md
    wishlist.md
    tools.md
    in-code-documentation.md
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+# Setup CTSM
+
+For running CTSM on the Norwegian cluster you will be affilicated with a project account. 
+
+To check which project you are affiliated with can run by typing
+
+    [~/HOME]$ projects
+
+after logging to a remote HPC-computer. This will return something that looks like this
+
+    nn2806k
+    nn1000k
+
+In the example above, two projects can be used (nn2806k and nn1000k). The project you are affiliated with will depend on the accout you used when you applied for resources. Make sure you choose the right project when running CTSM. 
+
+## Setting up and running a case 
+The [original documentation](https://escomp.github.io/ctsm-docs/versions/master/html/users_guide/setting-up-and-running-a-case/index.html) gives a detailed description of how to create and run a case.  
+
+
+
+### Why do we do a spin-up?
+The idea behind doing a so-called **spin-up** is to reach an
+equilibrium state in your model. Typically any perturbation (e.g. 2x CO2) experiment starts from such a state.
+
+Running our perturbed system into equilibrium again will give you
+the maximum impact of the perturbation.
+
+### Which variables are important to check?
+Since we are interested in the equilibrium state of our system, the
+"slowest" variables matter the most (e.g. terrestrial soil
+carbon).
+
+#### BioGeoChemistry mode 
+If you are running in BioGeoChemistry (BGC) mode, it is important to
+check the *health* of your vegetation. The variable directly associated with the health
+is `Total Leaf Area
+Index (TLAI)`. 
+
+If `TLAI=0` your vegetation is dead and something went really
+wrong.
+
+### How long should a spin-up be?
+The overall duration (years before an equilibrium state is reached)
+varies. As mentioned above, the variables with the slowest turnover rate
+will define the time you'd need to spend for your spin-up.
+
+The rule of thumb for single-cell simulation is the higher the
+latitude the longer the spin-up. Spinning up a single cell case in the Tropics will approximately
+take 2x100 years after which the terrestrial carbon pools are in
+equilibrium (Fig.1). In the polar regions, this means that the spin-up time is a couple of 1000 years!
+
+```{figure} img/spinup_brazil_example.png
+:alt: Spin-up for a single cell case in the Tropics 
+
+Spin-up for a single cell case in the Tropics 
+```
+
+### What does equilibrium mean?
+Typically you'd cycle through a range of given meteorological
+years - referred to as time-slice (e.g. 1990-2000).
+
+After an initial rapid increase/decrease in your variables, you will
+start to see the interannual variability of the chosen time slice
+(wiggling). Equilibrium is reached as soon as consecutive time slices differ by
+less than a threshold that you have to choose (\< 0.1-1%).
+
+## How to perform a spin-up?
+Usually, we do a two-staged spin-up. See the necessary XML change commands below (NB you have to stand in the folder where you created your case for this to work!).
+
+`````{tabs}
+  ````{tab} Accelerated decomposition
+
+    Can be used for a reduced size of the carbon pools.
+    The following code would be saved in the script `~/MY_CASE/tailor_my_case_acc_spin_up.sh`,
+    to tailor the type of case you want to run
+        
+        ./xmlchange CLM_FORCE_COLDSTART="on"
+        ./xmlchange CLM_NML_USE_CASE="2000_control"
+        ./xmlchange DATM_CLMNCEP_YR_START="1991"
+        ./xmlchange DATM_CLMNCEP_YR_END="2010"
+        ./xmlchange DATM_PRESAERO="clim_2000"
+        ./xmlchange CCSM_CO2_PPMV="369."
+        ./xmlchange STOP_OPTION="nyears"
+        ./xmlchange RUN_REFDATE="0001-01-01"
+        ./xmlchange RUN_STARTDATE="0001-01-01"
+
+        #Additional xml changes for AD mode
+        ./xmlchange CLM_ACCELERATED_SPINUP="on"
+
+        #Number of years for spin-up 
+        #For Tropics only STOP_N=100 is needed!
+        ./xmlchange STOP_N=100
+
+        #Frequency of restart files (1/4 of STOP_N)
+        ./xmlchange REST_N=25
+
+        #Setting wall clock time (on saga 5 years / 30 min)
+        ./xmlchange JOB_WALLCLOCK_TIME=36:00:00
+        ./case.setup
+        ./preview_namelists
+  ````
+
+  ````{tab} Normal spin-up
+
+    Can be used for a normal size of the carbon pools. 
+    The following code would be saved in the script `~/MY_CASE/tailor_my_case_normal_spinup.sh`,
+    to tailor the type of case you want to run
+
+        # Switch off cold start
+        ./xmlchange CLM_FORCE_COLDSTART="off"
+        ./xmlchange CONTINUE_RUN="FALSE"
+
+        # Factory but re-define reference time
+        ./xmlchange RUN_REFDATE="0401-01-01"
+        ./xmlchange RUN_STARTDATE="0401-01-01"
+
+        #Additional xml changes for AD mode
+        ./xmlchange CLM_ACCELERATED_SPINUP="off"
+        ./xmlchange STOP_N=100
+
+        #Frequency of restart files (1/4 of STOP_N)
+        ./xmlchange REST_N=25
+
+        #Setting wall clock time
+        ./xmlchange JOB_WALLCLOCK_TIME=36:00:00
+        ./case.setup
+
+        #Point to restart file (IMPORTANT: Do not forget the single-quotation marks '<path to restart file>')
+        echo "finidat = '${restart_file}'" >> user_nl_clm
+        echo "Restart file: ${restart_file}"
+```
+`````