### Categories

E3SM I-cases are for ATM data model, for example, ELM + MOSART forced by climate forcing. The default climate data is Qian2006 at T62 grid. There are two ways to replace this forcing.

##### 1. Change the paths in cime

Only one file needs to be modified in this file: /cime/src/components/data_comps/datm/cime_config/namelist_definition_datm.xml

• Stream domain file directory the directory that contains domain file
• Stream domain file name the domain file that associated with the forcing file
• Stream data file directory the forcing file direcotory
##### 2. Define a user stream file
• Copy the datm.streams.txt.CLM... file from CaseDocs to the case directory (one level up)
• Change the paths to the new forcing files in this file
• Modify the file name by adding user_ header

[Reference from CESM] (http://www.cesm.ucar.edu/models/cesm1.2/data8/doc/c72.html)