Letter to the Editor: A strange cloud in the Arctic summer stratosphere 1998 above Esrange (68°N), Sweden
International audience When the University of Bonn lidar on the Esrange (68°N, 21°E), Sweden, was switched on in the evening of July 18, 1998, a geometrically and optically thin cloud layer was present near 14 km altitude or 400 K potential temperature, where it persisted for two hours. The tropopau...
Main Authors: | , , , |
---|---|
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2000
|
Subjects: | |
Online Access: | https://hal.science/hal-00316639 https://hal.science/hal-00316639/document https://hal.science/hal-00316639/file/angeo-18-505-2000.pdf |
id |
ftccsdartic:oai:HAL:hal-00316639v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-00316639v1 2023-11-12T04:13:26+01:00 Letter to the Editor: A strange cloud in the Arctic summer stratosphere 1998 above Esrange (68°N), Sweden Siebert, J. Timmis, C. Vaughan, G. Fricke, K. H. Physikalisches Institut Bonn Rheinische Friedrich-Wilhelms-Universität Bonn Physics Department University of Wales 2000 https://hal.science/hal-00316639 https://hal.science/hal-00316639/document https://hal.science/hal-00316639/file/angeo-18-505-2000.pdf en eng HAL CCSD European Geosciences Union hal-00316639 https://hal.science/hal-00316639 https://hal.science/hal-00316639/document https://hal.science/hal-00316639/file/angeo-18-505-2000.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316639 Annales Geophysicae, 2000, 18 (4), pp.505-509 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2000 ftccsdartic 2023-10-21T23:08:17Z International audience When the University of Bonn lidar on the Esrange (68°N, 21°E), Sweden, was switched on in the evening of July 18, 1998, a geometrically and optically thin cloud layer was present near 14 km altitude or 400 K potential temperature, where it persisted for two hours. The tropopause altitude was 4 km below the cloud altitude. The cloud particles depolarized the lidar returns, thus must they have been aspherical and hence solid. Atmospheric temperatures near 230 K were approximately 40 K too high to support ice particles at stratospheric water vapour pressures of a few ppmv. The isentropic back trajectory on 400 K showed the air parcels to have stayed clear of active major rocket launch sites. The air parcels at 400 K had traveled from the Aleutians across Canada and the Atlantic Ocean arriving above central Europe and then turned northward to pass over above the lidar station. Parcels at levels at ±25 K from 400 K had come from the pole and joined the 400 K trajectory path above eastern Canada. Apparently the cloud existed in a filament of air with an origin different from those filaments both above and below. Possibly the 400 K level air parcels had carried soot particles from forest wild fires in northern Canada or volcanic ash from the eruption of the Korovin Volcano in the Aleutian Islands. Article in Journal/Newspaper Arctic Aleutian Islands Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Canada Esrange ENVELOPE(21.117,21.117,67.883,67.883) Korovin ENVELOPE(156.492,156.492,52.947,52.947) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Siebert, J. Timmis, C. Vaughan, G. Fricke, K. H. Letter to the Editor: A strange cloud in the Arctic summer stratosphere 1998 above Esrange (68°N), Sweden |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience When the University of Bonn lidar on the Esrange (68°N, 21°E), Sweden, was switched on in the evening of July 18, 1998, a geometrically and optically thin cloud layer was present near 14 km altitude or 400 K potential temperature, where it persisted for two hours. The tropopause altitude was 4 km below the cloud altitude. The cloud particles depolarized the lidar returns, thus must they have been aspherical and hence solid. Atmospheric temperatures near 230 K were approximately 40 K too high to support ice particles at stratospheric water vapour pressures of a few ppmv. The isentropic back trajectory on 400 K showed the air parcels to have stayed clear of active major rocket launch sites. The air parcels at 400 K had traveled from the Aleutians across Canada and the Atlantic Ocean arriving above central Europe and then turned northward to pass over above the lidar station. Parcels at levels at ±25 K from 400 K had come from the pole and joined the 400 K trajectory path above eastern Canada. Apparently the cloud existed in a filament of air with an origin different from those filaments both above and below. Possibly the 400 K level air parcels had carried soot particles from forest wild fires in northern Canada or volcanic ash from the eruption of the Korovin Volcano in the Aleutian Islands. |
author2 |
Physikalisches Institut Bonn Rheinische Friedrich-Wilhelms-Universität Bonn Physics Department University of Wales |
format |
Article in Journal/Newspaper |
author |
Siebert, J. Timmis, C. Vaughan, G. Fricke, K. H. |
author_facet |
Siebert, J. Timmis, C. Vaughan, G. Fricke, K. H. |
author_sort |
Siebert, J. |
title |
Letter to the Editor: A strange cloud in the Arctic summer stratosphere 1998 above Esrange (68°N), Sweden |
title_short |
Letter to the Editor: A strange cloud in the Arctic summer stratosphere 1998 above Esrange (68°N), Sweden |
title_full |
Letter to the Editor: A strange cloud in the Arctic summer stratosphere 1998 above Esrange (68°N), Sweden |
title_fullStr |
Letter to the Editor: A strange cloud in the Arctic summer stratosphere 1998 above Esrange (68°N), Sweden |
title_full_unstemmed |
Letter to the Editor: A strange cloud in the Arctic summer stratosphere 1998 above Esrange (68°N), Sweden |
title_sort |
letter to the editor: a strange cloud in the arctic summer stratosphere 1998 above esrange (68°n), sweden |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00316639 https://hal.science/hal-00316639/document https://hal.science/hal-00316639/file/angeo-18-505-2000.pdf |
long_lat |
ENVELOPE(21.117,21.117,67.883,67.883) ENVELOPE(156.492,156.492,52.947,52.947) |
geographic |
Arctic Canada Esrange Korovin |
geographic_facet |
Arctic Canada Esrange Korovin |
genre |
Arctic Aleutian Islands |
genre_facet |
Arctic Aleutian Islands |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316639 Annales Geophysicae, 2000, 18 (4), pp.505-509 |
op_relation |
hal-00316639 https://hal.science/hal-00316639 https://hal.science/hal-00316639/document https://hal.science/hal-00316639/file/angeo-18-505-2000.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331437599424512 |