The JMC Code L Improvement 1 code and data can be dowloaded from the download link under http://mitgcm.org/projects/ESMF/JMClimprov1, This link will fetch a compresses tar archive called JMClimprov1.tar.gz. After downloading this file needs to uncompressed using the command gzip -d JMClimprov1.tar.gz and its contents extracted using the command tar -xvf JMClimprov1.tar into an appropriate workspace directory ( for example a directory under /s01/USERID (where USERID refers to a login name) on the cg01.lcs.mit.edu system ).