NOTICE: From 22 August 2014 through 4 Sept. 2015, the albedo at Table Mt. was consistently low by 1-2% compared to other years. The calibration of the pyranometer that was used during that period was checked and its responsivity value was found to be too great by 0.0164. On 16 Sept. 2015, the Table Mountain calibration file was adjusted and the upwelling solar recomputed over the affected period. The new data files were written to the FTP site on 16 Sept. 2015.
NOTICE: On 19 November 2014 the wind monitor was replaced at the Goodwin Creek SURFRAD site. When the replacement wind monitor was mounted, it was rotated 128 degrees clockwise from its proper alignment. Consequently, the wind direction reported in the SURFRAD processed data files was off by +128 deg. from 19 November 2014 through 11 May 2015. On 27 May 2015 all of the wind data during that ~6-month period was corrected and new daily data files with the proper wind direction were generated.
NOTICE: As of 1 Jan. 2015, ISIS network radiation data will be reported at a one-minute frequency.
NOTICE: The calibration value assigned to the quantum sensor that measured photosynthetically active radiation (PAR) at the Bondville SURFRAD station from 13-Jun-2014 through 13-Aug-2014 was found to be bad. A new calibration was assigned and all data during its two-month deployment were reprocessed. See the “Problems” page for more details.
NOTICE: The quantum sensor that measures photosynthetically active radiation (PAR) at the Penn State SURFRAD station lost approximately 4% sensitivity on 22 Sept. 2013. That sensor was replaced on 14 Nov. 2013 after which the PAR measurements increased to more normal values. On 21 Nov. 2013, the QC values of the Penn State SURFRAD PAR measurements over the affected period (22-Sept to 14-Nov. 2013) were set to bad (1), however, the PAR values were kept in the data files, i.e., not set to missing.
NOTICE: The clock in the Table Mountain SURFRAD station data logger drifted linearly from late October 2012 to 5 May 2013. On 5 May 2013 the clock time was found to be fast by nearly four minutes, and the problem was fixed. A linear correction has been applied to the time in all Table Mountain raw data files for that period and those files have been reprocessed. The new time-corrected data files were uploaded to the SURFRAD FTP site on 15 August 2013.
NOTICE: The station pressure at Penn State drifted by about 0.4 mb per year between 11-April-2003 and 18-June-2012. Those data have been corrected and new Penn State SURFRAD daily files have been generated with corrected pressure for the affected period.
NOTICE: The README file that describes the SURFRAD data files has been updated. Please download the latest version from any of the individual station FTP data directories, e.g., ftp://aftp.cmdl.noaa.gov/data/radiation/surfrad/Bondville_IL.