Abstract
The application of a mobile DIAL (differential absorption lidar) remote sensing system inmeasurements of gas fluxes is discussed. UV-DIAL has been employed in the monitoring ofsulphur dioxide and mercury emissions both from natural and anthropogenic sources. The concentration distributions downwind from the sources, deduced from vertical lidar scans ortraverses under the plumes, were combined with wind data to determine the atmospheric fluxes of these gases. Measurements of the total flux of sulphur dioxide from the Italian volcanoes Etna, Stromboli and Vulcano were performed from an oceanographic research ship makingtraverses under the volcanic plumes with the lidar system sounding vertically. Some resultsfrom lidar measurements on atmospheric atomic mercury in Italian geothermal fields are alsopresented. Finally, some examples of remote monitoring of industrial emissions are given. Themobile DIAL system has been used for measurements on several Swedish industrial plantswithin the framework of a control programme commissioned by the Swedish Environmental Protection Agency.
