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GOME stratospheric NO2 data


Introduction   Station Data   Gridded Data   Disclaimer   Contact

Introduction:

For the European project QUILT, a complete time series of GOME NO2 columns has been created which can be downloaded in ASCII format as gridded monthly averages or daily values over the QUILT stations

For a description of the method used to derive the NO2 columns, please see:

and

For data after the end of nominal GOME operations please have a look at our SCIAMACHY pages or go directly to the SCIAMACHY NO2 data page.

TopGOME total NO2 columns over stations Version 1:

Please also read the disclaimer.

The data format is plain ASCII with 27 header lines starting with a '*' character followed by the lines with the data organized in 9 columns separated by blanks:

column 1: fractional day of year 1993 UT

column 2: fractional day of year UT

column 3: solar zenith angle []

column 4: daily average slant column of NO2 [molec cm-2] in 200 km radius

column 5: daily average vertical column of NO2 [molec cm-2] in 200 km radius

column 6: daily minimum slant column of NO2 [molec cm-2] in 200 km radius

column 7: daily minimum vertical column of NO2 [molec cm-2] in 200 km radius

column 8: daily maximum slant column of NO2 [molec cm-2] in 200 km radius

column 9: daily maximum vertical column of NO2 [molec cm-2] in 200 km radius

 

Station Lat. Long.
Ny-Alesund, Spitzbergen 78.9N 11.9E
Summit, Greenland 72.5N 38W
Scoresbysund, Greenland 70.5N 22.0W
Andoya, Norway 69.3N 16.0E
Kiruna, Sweden 67.8N 21.1E
Sodankyla, Finland 67.4N 26.7E
Salekhard, Siberia 66.7N 66.7E
Zhigansk, Russia 66.7N 123.4E
Harestua, Norway 60.2N 10.8E
Bremen, Germany 53.1N 8.9E
Aberystwyth, UK 52.0N 4.1W
Jungfraujoch, Switzerland 46.6N 8.0E
OHP, France 43.9N 5.7E
Mt Cimone, Italy 44.2N 10.7E
Bologna, Italy 44.5N 11.3E
Stara Zagora, Bulgaria 42.4N 25.0E
Izana, Canaries 28.3N 16.5W
Merida, Venezuela 21.0N 99.5W
Paramaribo, Suriname 5.8N 55.2W
Tarawa, Kiribati Republic 1.4N 172.9E
Nairobi, Kenya 1.3S 36.8E
Reunion Island 21.1S 55.5E
Bauru, Brazil 22.4S 49.0W

Lauder, New Zealand

45.0S 169.7E
Kerguelen Island 49.4S 70.3E
Dumont dUrville, Antarctica 66.7S 140E
Marambio, Antarctica 64.3S 56.7W
Faraday, Antarctica 65.3S 64W
Rothera, Antarctica 67.6S 68.1W
Neumayer, Antarctica 70.7S 8.3W
Terra Nova Bay, Antarctica 74S 164E
Arrival Heights, Antarctica 77.8S 166.7E
Want more stations? Send a request to Andreas Richter.

TopGridded GOME total NO2 columns Version 1:

Please also read the disclaimer.

The data format is plain ASCII with 24 header lines starting with a '*' character followed by 360 blocks of data for the 0.5 latitude bands starting with 90S-89.5S. Each latitude block consists of 720 0.5 longitude values starting with 180W-179.5E and starts with a comment line stating the centre latitude of the block, e.g. "* lat = -89.7500". All values are given in units of 10E14 molec cm-2 using 999.99 as an error flag for missing values.

These are encrypted zip-files, for the password please contact Andreas Richter.

TopDisclaimer:

GOME NO2 columns provided on this page are a scientific product created at the University of Bremen and based on the operational lv1-spectra provided by DFD/DLR Oberpfaffenhofen and ESA. They are not related to the operational GOME lv2-products distributed by DFD/DLR that also contain NO2 columns. Although the two GOME NO2 data products agree qualitatively, the differences are significant, in particular with respect to seasonal changes.

The NO2 columns in the files provided on this page are total columns assuming a stratospheric profile. Wherever there is substantial NO2 in the troposphere (for example in polluted regions such as Italy or Germany), the columns will exceed the real stratospheric ones and are not very accurate.

To correct for drifts in the GOME instrumental function, all NO2 columns are normalized with respect to the equatorial Pacific where a constant vertical column of 2E15 molec/cm2 of NO2 is assumed. This has two effects: i) any seasonal or interannual variability in NO2 in this region will lead to errors in the NO2 columns at all latitudes and ii) GOME NO2 columns in the tropics are not really independent measurements but strongly influenced by this a priori assumption. However, comparison with results from the SLIMCAT model indicates that the uncertainty introduced by the normalisation is smaller than 5E14 molec/cm2 in all conditions and usually well below this value.

TopContact Andreas Richter.

web master:  folkard@iup.physik.uni-bremen.de      Last Update: 25-05-18      Data Privacy