European Arctic Stratospheric Ozone Experiment (EASOE)

The European Arctic Stratospheric Ozone Experiment (EASOE) was undertaken in the northern winter of 1991-92 to study the processes in the Arctic which lead to ozone destruction and their connection with reduced ozone at northern mid-latitudes. The data from the campaign has been made available on CD-ROM by the Norwegian Institute for Air Research (NILU). The CDs are held at the BADC.

This two CD-ROM set contains measurements made from 16 ground stations throughout Europe, flights made by the three aircraft involved in the campaign, numerous stratospheric balloons launched from Kiruna in northern Sweden and from ozonesondes from 28 European stations. In addition data from the total ozone monitoring network are included.

The parameters measured include concentrations of ozone and the members of the chlorine and nitrogen families which are involved in the photochemical destruction of ozone, aerosol and PSC extinctions and meteorological parameters used to study transport into and out of the polar vortex.

The EASOE campaign coincided with the NASA AASE-II aircraft campaign and this dataset is also available from the BADC.

The EASOE data are held on two CD-ROMs at the BADC:

• The first holds the measurements of the chemical constituents and is public data (this CD is available for browsing purposes). This dataset is public.
• The second CD contains meteorological analyses and trajectory data from the European Centre for Medium-range Weather Forecasts (ECMWF). The content of this CD is restricted by a data protocol, and is not therefore publicly available. If you would like to use these data you should contact Geir Braathen at NILU, who will arrange for you to be granted access to the data.

The data on the CDs are stored in the so-called "NASA Ames format". This is an ASCII format with a header which describes the contents, allowing the data to be read by a standard set of software tools. The file structure is described in a postscript format specification document on the CDs. The CDs also contain a number of routines which allow you to read the data and plot it using UNIRAS.

There is a limited amount of documentation available on the CD for this dataset which has been extracted and made available through this WWW interface.

There is a special issue of Geophysics Research Letters (Volume 21, number 13 - June 1994) devoted to the EASOE campaign. A paper by Pyle et al. (see references) in that issue contains an overview of the mission and its objectives.

Norwegian Institute for Air Research, [Aimedieu, P.; Anderson, J.; Arnold, F.; Borchers, R.; Braathen, G.; Busing, J.; Camy-Peyret, C.; Cariolle, D.; Crutzen, P.; Damski, J.; de la Noe, J.; Delbouille, L.; De Muer, D.; Deshler, T.; de Zafra, R.; Eriksen, P.; Fabian, R.; Fiocco, G.; Fischer, H.; Flesia, C.; Fricke, K.H.; Gernandt, H.; Gil, M.; Giovanelli, G.; Godin, S.; Goutail, F.; Harries, J.; Helten, M.; Henriksen, K.; Herman, M.; Hughes, P.; Isaksen, I.; Jones, R.; Jorgensen, T.; Kampfer, N.; Khattatov, V.U.; Kley, D.; Kondo, Y.; Kunzi, K.; Kyro, E.; Larsen, N.; Matthews, A.; Megie, G.; Morschel, U.; Muller, R.; Murcray, D.G.; Nett, H.; Oelhaf, H.; O'Neill, A.; Ovarlez, J.; Penkett, S.; Perner, D.; Petzoldt, K.; Pirre, M.; Platt, U.; Pommereau, J.D.P.; Renger, W.; Roscoe, H.K.; Roeth, E.P.; Roth, A.; Runge, F.; Schiller, C.; Schmidt, U.; Sheldon, W.R.; Simon, P.; Staehelin, J.; Stefanutti, L.; Stordal, F.; Thomas, P.; Van Aalst, R.; Varotsos, C.; Vaughan, G.; Visconti, G.; Volkert; Wege, K.; Wolf, J.D.P.; Woods, P.; Zerefos, C.]. European Arctic Stratospheric Ozone Experiment (EASOE), [Internet]. Norwegian Institute for Air Research, 1992, Date of citation. Available from http://badc.nerc.ac.uk/view/badc.nerc.ac.uk__ATOM__dataent_EASOE.

If you would like to obtain a copy of the CD-ROM you should contact GeirBraathen or At the Norwegian Institute for Air Research (NILU).

General queries about these pages or browsing the data should be directed to the BADC support line. If you have queries about specific experiments, contacts for the individual Principal Investigators are listed in the documentation on the CD-ROM.