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European Arctic stratospheric ozone experiment : EASOE modelling


The primary objectives of this measurement campaign are: to study the processes of denitrification and dehydration; to search for evidence of photochemical destruction of ozone; to study the evolution of the Arctic vortex during the entire measurement period; and to study the processes by which chemically perturbed air is moved southward.

The European Arctic stratospheric ozone experiment (EASOE) will take place between November 1991 and March 1992. A variety of physical and chemical measurements of the northern hemisphere lower stratosphere will be made from the ground, from large and small balloons and from aircraft. Supporting theoretical analyses will be carried out.

During EASOE the following tasks will be accomplished.
Ozone concentration profiles will be measured using ozone sondes at 18 sites.
Ground based measurements will be made especially for EASOE at 20 northern hemisphere sites. Measurements will include ozone, nitrogen dioxide, hydrogen nitrate, bromine oxide, chlorine oxide, hydrogen chloride, hydrogen fluoride, temperature and polar stratospheric clouds.
It is planned to launch 39 stratospheric balloons from ESRANGE, Kiruna. These will carry scientific payloads to monitor the lower stratosphere making measurements of many chemical constitutents (ozone, nitrogen dioxide, hydrogen chloride, bromine oxide, chlorine oxide, methane, etc) as well as of temperature and polar stratospheric clouds.

All data obtained during the operational phase of EASOE (1 November 1991 until 31 March 1992) will be reported to the EASOE data centre at Nilu in Norway in preliminary form. Thereafter, necessary corrections will be reported during the period of data evaluation and interpretation.


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University of Cambridge
EU contribution
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Lensfield Road
CB2 1EW Cambridge
United Kingdom

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Participants (8)