Report on Atmospheric Effects (1995-2001) — October 1997
Atmospheric Effects (1995-2001)
Bulletin of the Global Volcanism Network, vol. 22, no. 10 (October 1997)
Managing Editor: Richard Wunderman.
Atmospheric Effects (1995-2001) Lidar data from Germany
Please cite this report as:
Global Volcanism Program, 1997. Report on Atmospheric Effects (1995-2001) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 22:10. Smithsonian Institution.
Atmospheric Effects (1995-2001)
All times are local (unless otherwise noted)
The Pinatubo aerosol layer at Garmisch-Partenkirchen declined to a minimum in the summer of 1996 (Bulletin v. 21, no. 12, and v. 22, no. 5). Since then no further decay has been observed. The backscattering ratio during June-October 1997 was consistently in the 1.05-1.08 range (Nd-YAG) with the peak layer altitude at 16.4-19.2 km (table 12).
Table 12. Lidar data from Germany (June-October 1997) showing altitudes of aerosol layers. Backscattering ratios are for the Nd-YAG wavelength of 0.53 µm with equivalent ruby values in parentheses. The integrated value shows total backscatter, expressed in steradians-1, integrated over 300-m intervals from the tropopause to 30 km. The "ci" stands for cirrus clouds; their presence in the tropopause region usually obscures the lower boundary of the aerosol layer. Courtesy of Horst Jager.
| DATE | LAYER ALTITUDE (km) (peak) | BACKSCATTERING RATIO | BACKSCATTERING INTEGRATED |
| Garmisch-Partenkirchen, Germany (47.5°N, 11.0°E) | |||
| 04 Jun 1997 | ci-25 (19.9) | 1.08 (1.16) | -- |
| 29 Jun 1997 | 9-26 (16.8) | 1.08 (1.15) | -- |
| 11 Jul 1997 | 13-27 (17.9) | 1.06 (1.12) | -- |
| 15 Jul 1997 | 12-27 (17.7) | 1.07 (1.14) | -- |
| 20 Jul 1997 | 10-27 (18.5) | 1.07 (1.14) | -- |
| 30 Jul 1997 | 13-24 (18.2) | 1.05 (1.10) | -- |
| 04 Aug 1997 | 12-25 (18.8) | 1.06 (1.12) | -- |
| 18 Aug 1997 | 12-25 (17.7) | 1.05 (1.10) | -- |
| 08 Sep 1997 | 14-25 (18.3) | 1.08 (1.15) | -- |
| 26 Sep 1997 | 14-28 (16.5) | 1.08 (1.16) | -- |
| 06 Oct 1997 | 13-28 (16.4) | 1.07 (1.14) | -- |
| 17 Oct 1997 | 14-26 (17.7) | 1.06 (1.13) | -- |
| 28 Oct 1997 | 11-28 (19.2) | 1.08 (1.16) | -- |
Information Contacts: Horst Jager, Fraunhofer-Institut fur Atmospharische Umweltforschung, Kreuzeckbahnstrasse 19, D-8100 Garmisch-Partenkirchen, Germany.
