SOURCE IDENTIFICATION DURING THE GREAT DUN FELL CLOUD EXPERIMENT 1993

A characterisation of the sources influencing the site for the final f ield campaign of the EUROTRAC subproject GCE (Ground-based Cloud Exper iment) at Great Dun Fell, Cumbria, Great Britain in April-May 1993 is presented. The sources were characterised mainly by means of aerosol f ilter and cascade impactor data, single particle analysis, gas data, d ata on aromatic organic compounds, cloud water ionic composition, meas urements of aerosol size distributions and hygroscopic properties and various meteorological information. Receptor models applied on the aer osol filter and impactor data sets separately revealed two major sourc e types being a marine sea spray source and a long-range transported a nthropogenic pollution source. The results of the receptor models were largely consistent with the other observations used in the source ide ntification. Periods of considerable anthropogenic pollution as well a s almost pure marine air masses were clearly identified during the cou rse of the experiment. (C) 1997 Elsevier Science Ltd.