TROPOSPHERIC OZONE DATA FROM AURA OMI/MLS

The OMI Level-2 footprint measurements have a "row anomaly" problem (beginning in late June 2007) which has been corrected for. The row anomaly problem became very bad in late January 2009 with about 1/3 of OMI's 60 rows greatly affected. Note that the first three lines in the ASCII files below provide information about the data. In effort to provide data values to three significant digits in these ASCII files, tropospheric column ozone (in Dobson Units) was multiplied by 10 and mean volume mixing ratio (in ppbv) was multiplied by 5. - J. R. Ziemke

MONTHLY-MEAN TROPOSPHERIC COLUMN OZONE (IN DOBSON UNITS X 10):

October 2004, November 2004, December 2004
January 2005, February 2005, March 2005, April 2005, May 2005, June 2005, July 2005, August 2005, September 2005, October 2005, November 2005, December 2005
January 2006, February 2006, March 2006, April 2006, May 2006, June 2006, July 2006, August 2006, September 2006, October 2006, November 2006, December 2006
January 2007, February 2007, March 2007, April 2007, May 2007, June 2007, July 2007, August 2007, September 2007, October 2007, November 2007, December 2007
January 2008, February 2008, March 2008, April 2008, May 2008, June 2008, July 2008, August 2008, September 2008, October 2008, November 2008, December 2008
January 2009, February 2009, March 2009, April 2009, May 2009, June 2009, July 2009, August 2009, September 2009, October 2009, November 2009, December 2009
January 2010, February 2010, March 2010, April 2010, May 2010, June 2010, July 2010, August 2010, September 2010, October 2010, November 2010, December 2010
January 2011, February 2011, March 2011, April 2011, May 2011, June 2011, July 2011, August 2011, September 2011, October 2011, November 2011, December 2011
January 2012, February 2012, March 2012, April 2012, May 2012, June 2012, July 2012, August 2012, September 2012, October 2012, November 2012, December 2012
January 2013 February 2013, March 2013, April 2013, May 2013 June 2013 July 2013 August 2013 September 2013 October 2013 November 2013 December 2013
January 2014 February 2014, March 2014, April 2014, May 2014 June 2014 July 2014 August 2014 September 2014 October 2014 November 2014 December 2014
January 2015 February 2015, March 2015, April 2015, May 2015 June 2015 July 2015 August 2015 September 2015 October 2015 November 2015 December 2015
January 2016 February 2016, March 2016, April 2016, May 2016 June 2016 July 2016 August 2016 September 2016 October 2016 November 2016 December 2016
January 2017 February 2017, March 2017, April 2017, May 2017 June 2017 July 2017 August 2017 September 2017 October 2017 November 2017 December 2017
January 2018 February 2018, March 2018, April 2018, May 2018 June 2018 July 2018 August 2018 September 2018 October 2018 November 2018 December 2018
January 2019 February 2019, March 2019, April 2019, May 2019 June 2019 July 2019 August 2019 September 2019 October 2019 November 2019 December 2019
January 2020 February 2020, March 2020, April 2020, May 2020, June 2020 July 2020 August 2020 September 2020 October 2020 November 2020 December 2020

Here is an IDL reader for the above ASCII data files



NOTES FOR ALL MONTHLY MEAN DATA: OMI/MLS tropospheric ozone was first determined daily by subtracting co-located MLS stratospheric column ozone from OMI total column ozone each day. Stratospheric column ozone from MLS was spatially interpolated (2D Gaussian/linear latitude-longitude interpolation) each day to fill in between the actual along-track measurements. Monthly mean fields were then determined by averaging all available daily data within each month. OMI total column ozone was filtered for near clear-sky conditions by including only measurements when coincident OMI reflectivity was less than 0.3. Further details for the OMI/MLS method are discussed by Ziemke et al. [2006] (PDF file, 5.0 Mb)

The tropospheric ozone measurements use National Centers for Environmental Prediction (NCEP) analyses and World Meteorological Organization (WMO) 2K per km vertical temperature gradient definition to determine tropopause pressure. All data correspond to ascending (south to north) daytime Aura orbits where MLS makes a limb profile measurement in the direction of the Aura spacecraft orbital motion about 7 minutes prior to the total ozone measurement from OMI. The data are gridded to 288 longitude grid points with central longitudes -179.375, -178.125, -176.875, …., 178.125, 179.375, and 120 latitude gridpoints with central latitudes -59.5, -58.5, -57.5, …, 58.5, 59.5. The first three lines of each data file is preamble text describing the data file, and is followed by the actual data beginning with latitude -59.5. IMPORTANT: All ASCII data files were scaled to maximize information content to three numeric characters per value. Tropospheric column ozone (TCO, in Dobson Units) was multiplied by 10. Any missing data is listed as "999" in the data files.







BACK TO HOME PAGE