April 10, 2007 -------------- The initial Level 1 files provided by Russ Scott for the Kendall Grassland site (US-Wkg) were posted. March 27, 2008 -------------- The L1, L2, L3, and L4 files previously available for Kendall Grasslands were removed since Russ Scott provided new files in March 2008. The new files, spanning 2004 to 2007, include corrections to longwave and net radiation fluxes. September 2, 2008 ----------------- The finalized L2 files (Version 2) produced by CDIAC resulting from files provided by Russ Scott in March 2008 have been posted. The new L2s include 2007 data and corrections to longwave and net radiation fluxes. New L3 and L4 files will be generated by Dario Papale (CarboEurope) and available soon. October 12, 2008 ---------------- Version 2 of the L3 and L4 files produced by Dario Papale for the US-Wkg site have been posted. March 25, 2010 -------------- Russ Scott provided new files (third iteration or Version 3) for the US-Wkg site and these new files replace all previous Level 1 files. The new files contain data through 2009 and the following changes to the previous 2004-07 data. 1. Some (small) corrections to the way that that Fc was being computed 2. Ground heat flux-corrected bulk density to revise change in storage component to the flux 3. (for 2005-2007 only) undid corrections to the longwave components of Rn. Subsequent comparisons with a nearby, independent site revealed that these corrections were unwarranted. April 14, 2010 -------------- Version 3 of the L2 files for the Kendall Grassland site were posted and contain data through 2009. These files replace all previous versions and contain the changes mentioned above for 3/25/2010. March 28, 2011 -------------- Version 4 of the Level 2 files for the US-Wkg site were posted and contain data through 2010. Data before 2010 did not change from Version 3. January 4, 2013 --------------- Version 5 (V005) of the Level 2 files for the Kendall Grassland site was posted and provides data through 2011. Several corrections to data from earlier years are included in the latest version. Specifically, for 2005 through 2010 the flux terms (Fc, LE, and H) were re-processed to include frequency response corrections. PAR values for the period 2007 to 2010 were re-calculated using a new calibration coefficient and soil heat flux data for 2005 through 2008 were re-processed for spike filtering. April 10, 2013 -------------- Version 6 (V006) of the Level 2 (L2) files for US-Wkg was posted and provides data through 2012. Data before 2012 did not change from V005. February 20, 2014 ----------------- Version 7 (V007) of the Level 2 (L2) files for US-Wkg was posted and provides data through 2013. Data before 2011 did not change from V006. PAR data only for 2012 have been revised from V006. May 28, 2015 ------------ Version 8 (V008) of the Level 2 (L2) files for the Kendall Grassland site (US-Wkg) was posted and provides data through 2014. Data before 2014 did not change from V007. December 22, 2015 ----------------- Version 9 (V009) of the Level 2 (L2) files for the Kendall Grassland site (US-Wkg) was posted and provides data through 2014. V009 replaces all previous versions and reflects a correction on the time stamp across the entire period of record. Measurement values and estimates in V009 did not change from V008. February 23, 2016 ----------------- Version 10 (V010) of the Level 2 (L2) files for the Kendall Grassland site (US-Wkg) was posted and provides data from 2004 through 2015. V010 differs from V009 (1) with the inclusion of 2015 estimates for the first time, (2) revisions to soil moisture records for 2012-2014, and (3) revision of radiation, incoming and outgoing PAR terms in 2014. Details about the processing by CDIAC of the original files submitted by Russ Scott to produce the standardized V010 L2 files are provided at ftp://cdiac.ornl.gov/pub/ameriflux/data/Level2/Sites_ByID/US-Wkg/with_gaps/report_Kendall_Grassland.html