Setup GSI run scripts for chemical analysis

GSI CHEMICAL ANALYSIS FOR CMAQ

Setup GSI run scripts for chemical analysis

The script run_gsi_chem.ksh was built based on regional GSI run scripts and has a similar structure to the regional run scriptrun_gsi_regional.ksh, but include a couple of different details.

The first part of the run script sets up the computer environment and case configuration. This is the similar to the regional analysis run scripts, except for the namelist for the chemical application, the specification of the chemical cases (bk_core and obs_type):

• Set the analysis date: ANAL_TIME=2013062112
• Set the observation file: PREPBUFR=${OBS_ROOT}/anow.2013062112.bufr
• Set the background file: BK_FILE=${BK_ROOT}/cmaq2gsi_4.7_20130621_120000.bin
• Set to use the namelist for chemical analysis: 
  GSI_NAMELIST=${GSI_ROOT}/ush/comgsi_namelist_chem.sh
• Set the core for the background file: BK_CORE=CMAQ
• Set the observation type: obs_type=PM2.5

Similar to the regional run script, this chemical run script will also double check the needed parameters. Then it creates a run directory and generates the namelist in the directory and copies the background, observations, and fixed files into the run directory

An example of the run script and namelist is available from the link run_gsi_chem.ksh namelist for chem