December 18, 2006
-----------------

Posted Version 1 of the Level 2 (L2) files for the Harvard Forest,
Massachusetts site (US-Ha1).  The files cover the time period 1992
through 2004.


March 25, 2007
--------------

Posted the first version (V1) of the Level 3 and 4 (L3, L4) files
for US-Ha1.


October 29, 2007
----------------

Posted Version 2 (V2) of the L2 files for US-Ha1.  Version 2 provides
data through 2006.  Data before 2005 did not change from Version 1.


July 7, 2008
------------

Bill Munger reviewed the V1 L3 and L4 files for US-Ha1 and discovered
differences in the productivity estimates produced by the Harvard
team and those produced through the standardized CarboEurope effort.
Munger and team believe a possible major source of the differences may
be in the gap filling techniques used by the CarboEurope effort for the
meteorological variables.  "Hybrid" L2 files are now being furnished for
processing by CarboEurope to produce another batch of L3 and L4 files.
The "hybrid" L2s contain the gap-filled meterological data created by
the Harvard team and the flux records with gaps, also provided by the
Harvard team.


October 12, 2008
----------------

New L3 and L4 files (Version 2) were posted and were generated using
the L2 "hybrid" files for Harvard Forest (i.e., flux records with gaps
and gap-filled meteorological records furnished by Bill Munger & team
at Harvard Forest).


March 16, 2009
--------------

New L2 files (Version 3) for the US-Ha1 site were posted and contain data
through 2007.  Previous data through 2006 did not change from Version 2.


October 27, 2010
----------------

New L2 files for Harvard Forest were posted.  The new Version 4 (V4)
files contain corrections to previously published Rn data for 2007 and
provide data through 2008.  Data for other variables are unchanged from
Version 3.  

October 6, 2011
---------------

Version 5 (V5) Level 2 files for Harvard Forest were posted.  The new file
provide data through 2009.  Details on the processing of the original
files provided by Bill Munger and team by CDIAC to produce the V5 L2
files are provided at

ftp://cdiac.ornl.gov/pub/ameriflux/data/Level2/Sites_ByName/Harvard_Forest/with_gaps/report_Harvard_Forest.html