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

MONTHLY-MEAN TROPOSPHERIC OZONE MEAN VOLUME MIXING
RATIO (IN UNITS PARTS PER BILLION X 5):

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

Here is an IDL reader for the above ASCII data files



The monthly mean ASCII data and IDL reader may also be downloaded using anonymous ftp:

> ftp jwocky.gsfc.nasa.gov

> Name: anonymous

> Password: (your email address)

> cd pub/ccd/data_monthly

> mget L3*

> get read_lvl3.pro



NEW: CSV FILES OF MONTHLY-MEAN TROPOSPHERIC OZONE:

Below are the webpage links for two CSV files of tropospheric ozone.
One file is tropospheric column ozone (TCO, in Dobson Units) and the
other is tropospheric ozone mean volume mixing ratio (VMR, in units
parts per billion). The two files each have three columns: (1)
first column is ozone value, (2) second column is longitude, and (3)
third column is latitude.

Tropospheric column ozone CSV file (TCO, in Dobson Units)

Tropospheric ozone mean volume mixing ratio CSV file
(VMR, in units parts per billion)



The above CSV files may also be downloaded using anonymous ftp:

> ftp jwocky.gsfc.nasa.gov

> Name: anonymous

> Password: (your email address)

> cd pub/ccd/data_monthly

> get tco_oct04_to_dec13.csv

> get vmr_oct04_to_dec13.csv

> get read_lvl3.pro



NOTES FOR ALL MONTHLY MEAN DATA: OMI/MLS tropospheric ozone data were determined daily by subtracting MLS stratospheric column ozone from OMI total column ozone. 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. The monthly means were then determined by averaging all available daily data within each month. The formatting of the data files is standard "GRIDTOMS" at 1 degree latitude by 1.25 degree longitude resolution. OMI total column ozone was filtered for near clear-sky conditions by including only measurements when coincident OMI reflectivity was less than 0.3. Mean ozone volume mixing ratio (in ppbv) was calculated each day from tropospheric column ozone (TCO, in Dobson Units) from 1270*TCO/(Psurface-Ptropopause) where surface pressure and tropopause pressure in the denominator are measured in hPa (same as millibar). Further details for the OMI/MLS method are discussed by Ziemke et al. [2006] (PDF file, 5.0 Mb)




The daily gridded "along-track" ASCII data and IDL reader may be
downloaded using anonymous ftp (Note: total disk space required is
about 200 Mbytes for either tropospheric column ozone or tropospheric
ozone mean volume mixing ratio):

> ftp jwocky.gsfc.nasa.gov

> Name: anonymous

> Password: (your email address)

> cd pub/ccd/data

> mget L3*

> get read_lvl3.pro










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