Amitabh, I did not look at the code (ini_spherical_polar) but I don't think that delyY can be a negative value nor that your domain can extend south of 90S. Dimitris -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mitgcm.org/pipermail/mitgcm-support/attachments/20040621/2330710c/attachment.htm>