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Stratospheric NO2 data from SCIAMACHY


Introduction   Station Data   Disclaimer   Climatology  Contact   Links

Introduction:

For validation purposes, a time series of all daily SCIAMACHY NO2 columns (August 2002 - April 2012) within a 200 km radius has been created which can be downloaded in ASCII format for all SCIAMACHY validation stations

For data before SCIAMACHY operations please have a look at our GOME pages or go directly to the GOME NO2 data page. There also is a similar page based on GOME-2 stratospheric data which provides much better spatial coverage and continues after April 8, 2012 when ENVISAT ceased operation.

TopSCIAMACHY stratospheric NO2 columns over stations Version 2.1:

Existing data have been updated to V2.1 on June 7, 2007. The differences to version 2.0 are

  • fix of a bug in the time stamp close to the date change (affects only few stations and only the time stamp, not the columns)

  • limitation to lv1 data which improves consistency but reduces the coverage slightly

The old version 1.5 data have been replaced by a new data release V2.0 on November 20, 2006. The differences to version 1.5 are

  • much more data in 2002 and 2003 as consolidated SCIAMACHY lv1 files were used

  • less effects of drift as daily solar spectra have been used

  • no offset is applied to the slant columns any more leading to significant improvement compared to ground-based measurements

Please also read the disclaimer.

The data format is plain ASCII with 26 header lines starting with a '*' character followed by the lines with the data organized in 10 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

column 10: average chisquare of retrieval

 

Station data Plot Lat. Long.
Eureka plot 80.1N 86.4W
Ny-Alesund, Spitzbergen plot 78.9N 11.9E
Summit, Greenland plot 72.5N 38W
Thule plot 76.5N 68.8W
Scoresbysund, Greenland plot 70.5N 22.0W
Andoya, Norway plot 69.3N 16.0E
Kiruna, Sweden plot 67.8N 21.1E
Sodankyla, Finland plot 67.4N 26.7E
Salekhard, Siberia plot 66.7N 66.7E
Zhigansk, Russia plot 66.7N 123.4E
Trondheim, Norway plot 63.7N 10.5E
Harestua, Norway plot 60.2N 10.8E
St. Petersburg, Russia plot 60.0N 30.3E
Zvenigorod, Russia plot 55.4N 36.5E
Bremen, Germany plot 53.1N 8.9E
Aberystwyth, UK plot 52.0N 4.1W
Zugspitze, Germany plot 47.4N 12.0E
Jungfraujoch, Switzerland plot 46.6N 8.0E
OHP, France plot 43.9N 5.7E
Mt Cimone, Italy plot 44.2N 10.7E
Kislovodsk plot 43.7N 42.7E
Rikubestu plot 43.5N 143.8E
Issyk-Kul plot 42.6N 77.0E
Stara Zagora, Bulgaria plot 42.4N 25.0E
Evora, Portugal plot 38.56N 7.90W
Kiso plot 35.8N 137.6E
Izana, Canaries plot 28.3N 16.5W
Mauna Loa plot 19.7N 155.6E
Djougou plot 9.7N 1.7E
Merida, Venezuela plot 8.2N 71.1W
Paramaribo, Suriname plot 5.8N 55.2W
Tarawa, Kiribati Republic plot 1.4N 172.9E
Nairobi, Kenya plot 1.3S 36.8E
Ciater Bandung plot 6.4S 107.4E
Saint-Denis plot 21.1S 55.4E
Bauru, Brazil plot 22.4S 49.0W
Wollongong plot 34.4S 150.9E
Lauder, New Zealand plot 45.0S 169.7E
Kerguelen Island plot 49.4S 70.3E
Rio Gallegos plot 51.6S 69.32W
Macquarie plot 54.5S 159.0E
Ushuaia, Argentinia plot 54.82S 68.32W
Marambio, Antarctica plot 64.3S 56.7W
Faraday, Antarctica plot 65.3S 64W
Dumont dUrville, Antarctica plot 66.7S 140E
Rothera, Antarctica plot 67.6S 68.1W
Syowa, Antarctica plot 69.0S 39.6E
Neumayer, Antarctica plot 70.65S 8.3W
Mario Zucchelli Station, Antarctica plot 74.69S 164.12E
Concordia, Antarctica plot 75.1S 123.35E
Belgrano, Antarctica plot 77.87S 34.62W
Arrival Heights, Antarctica plot 77.8S 166.7E
Want more stations or updated files? Send a request to Andreas Richter.

The full data set with all individual overpasses can be downloaded as a zip-file (> 170 MBytes) here.

TopDisclaimer:

SCIAMACHY NO2 columns provided on this page are a scientific product created at the University of Bremen and based on the operational lv0 and uncalibrated lv1-spectra provided by DFD/DLR Oberpfaffenhofen and ESRIN/ESA. They are not related to the operational SCIAMACHY lv2-products distributed by DFD/DLR that also contain NO2 columns. Although the two SCIAMACHY NO2 data products agree qualitatively, the differences are significant, and thorough validation will have to be performed of both products.

The NO2 columns in the files provided on this page are total columns assuming a stratospheric profile (US standard atmosphere with the troposphere set to 0). Wherever there is substantial NO2 in the troposphere (for example in polluted regions such as Germany), the columns will exceed the real stratospheric ones and are not very accurate.

As only part of the SCIAMACHY measurements is available to us at this time, all time series have substantial gaps that will be filled as more data is delivered by ESA. At the same time, some data are received several times and therefore have too much weight in the averages. As stratospheric NO2 fields are relatively smooth, this should usually not impact the results very much. In the next data version, duplicates will be removed.

To decontaminate the SCIAMACHY IR detectors, the instrument is heated on a regular basis. During these periods, data quality is reduced and larger errors are to be expected.

TopTotal NO2 climatology:

SCIAMACHY data from 2003 to 2007 have been averaged on a monthly basis to create a NO2 total column climatology on a 0.125 x 0.125 grid. The data are a combination of the tropospheric columns (see SCIAMACHY tropospheric NO2 page) and the estimate of the stratospheric column derived over the Pacific. More details are given in the readme file included in the archive file with the climatology.

Download: SCIAMACHY total NO2 column climatology (70 MBytes)

Top Links:

TopContact

If you have any questions, comments or data requests, please contact Andreas Richter.

web master:  folkard@iup.physik.uni-bremen.de      Last Update: 11-04-16