The objective of the project is the extension of the EASOE ozonesonde data set to 1993-94 and 1994-95 over Europe within SESAME, with the following specific goals:
- climatology of the ozone profile in winter above the Arctic and Europe;
- evaluation of the ozone losses during the two winters;
- support to satellite, aircraft, balloon and ground-based measurements;
- support to model simulations.
The project is to perform regular soundings once a week for climatic investigations over a wide geographic area during winter 1993-94 and 1994-95 from January to March 1994 and October 1994 to March 1995, re-enforced to twice a week from 15 November-15 December and during January and February, i.e. when ozone depletion is most likely to occur. The extra-sondes are expected to be launched on alert from forward isentropc trajectory modelling in order to evaluate a possible ozone photochemical change: where a trajectory passes near to another station, a second sonde will be triggered for launch at the appropriate time. The ozonesonde data will be entered into the data bank at NILU in real time by modem or e-mail so that they are available for all SESAME participants.
The stations selected in the project are stations already conducting ozonesonde programmes funded nationally and equipped with telemetry receivers, balloon inflations shelters and ozone calibration equipment. Consumables only will be provided: ECC ozonesondes (with the exception of Uccle in Belgium having a long record with Brewer-Mast), Vaisala transmitters, rubber balloons and some plastic balloons for cold temperature flights.
On average, weekly launches are anticipated only during the first phase of the campaign, although the trajectory forecasting method will be tested with a limited number of stations. Trajectories will be calculated from all sounding stations by the Danish Meteorological Institute from the ECMWF weather forecast model, scrutinised by a small operational group (NILU, Wales, DMI and CNRS) in conjunction with the SESAME Core Group, and alert messages to the field stations will be issued, recommending launches on a given day.
Funding SchemeCSC - Cost-sharing contracts
SY23 3BZ Aberystwyth