Community GSIV3.7 Online Tutorial | Case 1: Single observation test with GLOBAL BE > Setting up the Run Script

ARW SINGLE OBSERVATION TEST W/ GLOBAL BE

Setting up the Run Script

For this exercise, make a copy of the prepared basic run script from the section Prepare run script for basic cases: 

cp run_gsi_regional.ksh run_gsi_regional.ksh_psot. 

Make the following additional modifications to the script run_gsi_regional.ksh_psot:

• Set the name/path for the analysis run directory
• Set up the one observation test option to true
• if_oneob=Yes
• Select the background field format
• bk_core=ARW
• Select the global background error covariance
• bkcv_option=GLOBAL

An example of this run script is available from the link run_gsi_regional.ksh

Check the GSI namelist

Users can check the namelist to see how to set up a single observation test. The related namelist options include :

• oneobtest=.true.
• Set the location of the pseudo observation: &SINGLEOB_TEST
maginnov=1.0,magoberr=0.8,oneob_type='t',
oblat=38.,oblon=279.,obpres=500.,obdattim=${ANAL_TIME},
obhourset=0.,
/

An example namelist is available here.