September 2, 2008
-----------------

Version 2 of the Level 2 (L2) files for the University of Michigan
Biological Station site (US-UMB) were posted and provide updates through
2006.  New data include additional Ts measurements (e.g., 2 cm) and Fc
estimates without U* adjustments, unlike previous Fc values reported.


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

Version 2 of the L3 files were posted.


December 16, 2008
-----------------

Version 2 of the L4 files were posted.


February 23, 2010
-----------------

Version 3 of the L2 files were posted and include data through 2008.
Data prior to 2007 did not change.


March 11, 2011
--------------

Version 4 of the L2 files for the UMBS site (US-UMB) were posted and
include data into 2010.  The latest batch of UMBS files were provided
by Gil Bohrer and cover the period 2007-2010.  The latest batch of files
are reported on the preferred half-hourly basis rather than the previous
hourly basis.  The new files also reflect re-analysis using different
despiking and gap-filling techniques.  To maintain the longevity of the
UMBS L2 record, CDIAC provides both hourly (1999-2010) and half-hourly
(2007-2010) sets of L2 files.

The changes and calculations made by CDIAC during the creation of the
L2 files during processing of the Level 1 files provided by Bohrer and
team are detailed in

ftp://cdiac.ornl.gov/pub/ameriflux/data/Level2/Sites_ByName/UMBS/with_gaps/report_UMBS.html