fixes #3042

[bena-nasa]

See issue, as discussed, changed default ExtData used in ExtDataDriver.x for my own benefits but did not touch Cap.

Types of change(s)

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Trivial change (affects only documentation or cleanup)
• [X] Refactor (no functional changes, no api changes)

Checklist

• [ ] Tested this change with a run of GEOSgcm
• [ ] Ran the Unit Tests (make tests)

Description

Related Issue