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
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
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
NOTES FOR THE 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)
DAILY TROPOSPHERIC OZONE "ALONG-TRACK" DATA:
Example image - June 1, 2009:
(click thumbnail
for large image)
Example image - June 2009:
(click thumbnail
for large image)
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
NOTES: The daily gridded tropospheric ozone data were determined
using only "along-orbital track" measurements between OMI and MLS (see
above example images). There was no attempt to use either
interpolation or transport schemes to fill in MLS stratospheric column
ozone between orbital tracks. The data (similar to the above monthly
means) used National Centers for Environmental Prediction (NCEP)
analyses and the World Meterological Organization (WMO) 2K per km
vertical temperature gradient definition to determine tropopause
pressure. These along-track measurements are referred to as being
"co-located" regarding Aura OMI and MLS retrievals. The data
correspond to ascending (south to north) daytime 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 formatting of the data files is identical
to the above monthly mean data files. The file naming for daily
tropospheric column ozone goes as L3_tropo_ozone_column_YYYYMMDD_at,
while for daily mean volume mixing ratio it goes as
L3_tropo_ozone_vmr_YYYYMMDD_at. (YYYY refers to year, MM refers to
month, and DD refers to day of the month.) Important note: The ASCII
data files have been scaled to maximize information content given
three numeric characters per value. Tropospheric column ozone (in
Dobson Units) was multiplied by 10. Tropospheric mean volume mixing
ratio (in ppbv) was multiplied by 5. The user may find these
measurements useful for multi-year scientific analysis or as a
stand-alone reference or "baseline" data set for comparing with
tropospheric ozone from other sources (e.g., satellite, ground-based,
models).
BACK TO HOME PAGE
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
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
NOTES FOR THE 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)
DAILY TROPOSPHERIC OZONE "ALONG-TRACK" DATA:
Example image - June 1, 2009:
(click thumbnail
for large image)
Example image - June 2009:
(click thumbnail
for large image)
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
NOTES: The daily gridded tropospheric ozone data were determined
using only "along-orbital track" measurements between OMI and MLS (see
above example images). There was no attempt to use either
interpolation or transport schemes to fill in MLS stratospheric column
ozone between orbital tracks. The data (similar to the above monthly
means) used National Centers for Environmental Prediction (NCEP)
analyses and the World Meterological Organization (WMO) 2K per km
vertical temperature gradient definition to determine tropopause
pressure. These along-track measurements are referred to as being
"co-located" regarding Aura OMI and MLS retrievals. The data
correspond to ascending (south to north) daytime 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 formatting of the data files is identical
to the above monthly mean data files. The file naming for daily
tropospheric column ozone goes as L3_tropo_ozone_column_YYYYMMDD_at,
while for daily mean volume mixing ratio it goes as
L3_tropo_ozone_vmr_YYYYMMDD_at. (YYYY refers to year, MM refers to
month, and DD refers to day of the month.) Important note: The ASCII
data files have been scaled to maximize information content given
three numeric characters per value. Tropospheric column ozone (in
Dobson Units) was multiplied by 10. Tropospheric mean volume mixing
ratio (in ppbv) was multiplied by 5. The user may find these
measurements useful for multi-year scientific analysis or as a
stand-alone reference or "baseline" data set for comparing with
tropospheric ozone from other sources (e.g., satellite, ground-based,
models).
BACK TO HOME PAGE
(click thumbnail
for large image)
Example image - June 2009:
(click thumbnail
for large image)
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
NOTES: The daily gridded tropospheric ozone data were determined
using only "along-orbital track" measurements between OMI and MLS (see
above example images). There was no attempt to use either
interpolation or transport schemes to fill in MLS stratospheric column
ozone between orbital tracks. The data (similar to the above monthly
means) used National Centers for Environmental Prediction (NCEP)
analyses and the World Meterological Organization (WMO) 2K per km
vertical temperature gradient definition to determine tropopause
pressure. These along-track measurements are referred to as being
"co-located" regarding Aura OMI and MLS retrievals. The data
correspond to ascending (south to north) daytime 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 formatting of the data files is identical
to the above monthly mean data files. The file naming for daily
tropospheric column ozone goes as L3_tropo_ozone_column_YYYYMMDD_at,
while for daily mean volume mixing ratio it goes as
L3_tropo_ozone_vmr_YYYYMMDD_at. (YYYY refers to year, MM refers to
month, and DD refers to day of the month.) Important note: The ASCII
data files have been scaled to maximize information content given
three numeric characters per value. Tropospheric column ozone (in
Dobson Units) was multiplied by 10. Tropospheric mean volume mixing
ratio (in ppbv) was multiplied by 5. The user may find these
measurements useful for multi-year scientific analysis or as a
stand-alone reference or "baseline" data set for comparing with
tropospheric ozone from other sources (e.g., satellite, ground-based,
models).
BACK TO HOME PAGE
for large image)
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):