3 Simulation

The following scripts are provided by the author for running CESM with LCZs.

Modify job script

• use_lcz: If true, use 10-LCZ urban land cover representation instead of the default 3-class scheme.

• Define the LCZ-based surface input. Please refer to the last section 2 Surface Input.

• Define the LCZ-based T_BUILDING_MAX stream and set the stream start and end time covering the simulation period.

  echo "use_lcz = .true.">> user_nl_clm
  echo "fsurdat='${SURF}'" >> user_nl_clm
  echo "stream_fldfilename_urbantv = '${INPUT}/project2/CTSM52_tbuildmax_OlesonFeddema_2020_0.9x1.25_simyr1849-2106_c240520.nc'">> user_nl_clm 
  echo "stream_year_first_urbantv = 1849" >> user_nl_clm
  echo "stream_year_last_urbantv = 2106" >> user_nl_clm
  echo "model_year_align_urbantv = 1849" >> user_nl_clm
  

• (optional) Enable collapse_urban = .true. to represent a single dominant LCZ class for each grid cell containing urban fractions.

  • This is cost-efficient for high-resolution simulations.

Surface initial data

• Currently, we do not have global initial data that fits well for LCZ urban classes. Thus, we need to spin up the model from a cold start.

• Generating LCZ-based initial data by interpolating the existing initial data with three urban classes might cause an error.