[CF-metadata] paleoclimate time axis

Karl Taylor taylor13 at llnl.gov
Fri Oct 29 16:10:58 MDT 2010

Hi all,

Example 4.6 in the convention shows an example for a paleoclimate 
time-axis, which I think should be made CF-compliant.  It has a calendar 
attribute defined as calendar="126 kyr B.P.", but according the the 
conventions, "the values currently defined for |calendar|" don't include 
this "paleo" option.  I propose adding the following sentence after the 
list of defined values for calendar (in section 4.4.1):

"The calendar attribute may also be used to identify the era of a 
paleoclimate simulation, when an exact year would be inappropriate.  The 
form of a paleoclimate calendar attribute should be patterned after this 
example:  calendar = "18 kyr B.P.", which indicates the simulation is 
for a period 18,000 years before present.  The appropriate units will 
usually be kyr, but yr or Myr might also be used."

If there are no immediate objections, I'll ask Jeff Painter to open up a 
track for this.

Best regards,

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