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Additional resources for Laser in der Umweltmeßtechnik / Laser in Remote Sensing: Vorträge des 11. Internationalen Kongresses / Proceedings of the 11th International Congress

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Res. 94, 5029-5041, 1989. Jager, H. and K. Wege, Stratospheric ozone depletion at northern midlatitudes after major volcanic eruptions, J. Atmos. Chern. 10, 273·287, 1990. Jager, H. and D. Hofmann, Midlatitude lidar backscatter to mass, area, and extinction conversion model based on in situ aerosol measurements from 1980 to 1987, Appl. Opt. 30, 129-138, 1991. , The Pinatubo eruption cloud observed by lidar at GarmischPartenkirchen, Geophys. Res . , 19, 191-194 , 1992. K. Graber and M. Furger Paul Scherrer Intitute, CH-5232 Villigen-PSI, Switzerland Abstract A scintillation-based optical technique for the measurement of the average wind velocity across a laser light beam is presented and first results are shown.

Explosive eruptions penetrating into the stratosphere can provide large signals to the atmospheric radiation budget and to atmospheric chemistry. The investigation of periods without volcanic input to the stratosphere provides information on non-volcanic sources of the stratospheric aerosol. Such sources are the diffusion of sulphurous precursor gases into the stratosphere or convective processes. In addition, sources resulting from anthropogenic activities cannot be ruled out. The stratospheric perturbation following the eruption of the volcano El Chich6n (Mexico), 1982, caused an increase in aerosol surface area which was sufficiently large for measurable ozone destruction through heterogeneous chemistry processes (HOFMANN and SOLOMON, 1989).

An example of these measurements is shown in Fig. 3. These demonstrate unambiguously the importance of the reference channel. 3a illustrates the signal received by the C02 channel. The signal spans over considerable time delay, due to luminescence arising from the cell windows and walls as well as from the laser beam dump. The strong luminescence gives an apparent signal which looks like a signal arriving after scattering from a more distant objects /2-4/. This apparent delay is attributed to the long-lived luminescence.

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