Atmospheric Trace Constituents: Proceedings of the 5th Two-Annual Colloquium of the Sonderforschungsbereich 73 of the Universities Frankfurt and Mainz and the Max-Planck-Institut M

This colloquium on Atmospheric Trace Constituents held in Mainz on July 1, 1981, was a joint one-day meeting of all scientific working groups of the SFB-73. The purpose of this meeting was to provide a fairly intensive and comprehensive review of the SFB-73 research work during the last two years and to discuss the state and the problems as well as possible future developments of the various projects. According to the scientific program of the SFB, the meeting consisted of two separate sessions devoted to actual research problems of trace gases (session I) as well as aerosol particles (session II) in the atmospheric environment. As in previous years, each of the 14 partial projects presented its efforts at least by one research contribution. In nearly twenty papers and discussions, methods, results and the present state of art as well as particularly numerous open questions in the experimental and theoretical studies could be explained. The range of topics considered can be gauged from the contents of this publication. The proceedings contain almost all papers presented at the colloquium. These papers have been issued as quickly as possible. Most of the authors devoted considerable efforts to keep within tight time and space deadlines. It is a pleasure to acknowledge these efforts here. A few number of papers, however, could only be re· ceived with a considerable time extension and this unfortunately caused an editorial delay of several months.

Table of Contents:
Session I: Trace Gases.- Measurements of reduced sulfur gases in the atmosphere.- On a diurnal variation of NO2 found in North Atlantic air masses.- A discussion of approximate relations for transfer and deposition of trace constituents in the ABL.- Measurements relating to the heterogeneous SO2-oxidation in the atmosphere.- Contribution of tropospheric SO2 to the stratospheric aerosol layer.- The photolysis of acetaldehyde under atmospheric conditions.- Tropospheric OH measurements.- Session II: Aerosol Particles.- Development of a new sunphotometer and establishment of a network across Africa for the investigation of the transport of Sahara dust.- The determination of the atmospheric heating rate due to the absorption of shortwave radiation in particles.- New meteorological applications of the aerosol physical chemistry.- On the flux and collision mechanism of the scavenging process of atmospheric aerosol particles.- Elemental particle size distribution of the tropospheric aerosol, determined by PIXE.- Investigation on the saturation-spectra of ice-nuclei.- The determination of absorptive properties of atmospheric aerosol particles using photoacoustic spectroscopy.