September 4, 2008
-----------------

Version 1 of the Walker Branch Level 2, 3, and 4 files were posted.  Level 2
files extend from 1995 through 2007, however, Level 4 files extend only from
1995 through 1999 due to the absence of CO2 data after 1999 necessary to
calculate the CO2 storage term.


December 8, 2009
-----------------

Version 2 of the Walker Branch Level 2 files were posted and provide the
variable nomenclature and units adopted for the entire network database.

Details on the processing of original Level 1 data into the Level 2 files
produced by CDIAC may be found at

ftp://cdiac.ornl.gov/pub/ameriflux/data/Level2/Sites_ByName/Walker_Branch/with_gaps/report_Walker_Branch.html