Aircraft-based tropospheric program

The GMOS program has actively supported the use of aircraft based campaigns because of the importance of understanding the vertical distribution of mercury and in particular oxidised gas phase mercury compounds and particulate bound mercury.

The deposition flux of mercury during precicpitation events has been found to be closely related to the vertical extent of rainclouds, with tall convective clouds producing higher mercury fluxes than shallower synoptic cloud.

The importance of measurement data in order to test and validate globall and regional and have confidence in simulatied mercury concentration and deposition fields.

During the project phase of GMOS the European Tropospheric Mercury Experiment Program performed a number of flights over Europe. The flightpaths were chosen to include maritme, rural, industrial and in one instance volcanic regions (Mt Etna in Sicily).

The ongoing CARIBIC project (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrumented Container) is EC funded and is an integral part of GMOS. Measurements onboard a Lufthansa Airbus 340-600 are continuing adding further data to this unique data set, which began measurements in May 2005.

The results are available on the GMOS SDI.