The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds
An anomalous red glow due to scattered sunlight was observed at Longyearbyen (78° N, 15° E) on 6 December 2002 from 07:30UT to 13:30UT when the solar zenith angle varied between 100.7° and 104°. A model for this red sky event using sunlight scattered in a two stage process by Polar Stratospheric Clo...
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ftcopernicus:oai:publications.copernicus.org:angeo35609 2023-05-15T17:08:27+02:00 The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds Lloyd, N. D. Degenstein, D. A. Sigernes, F. Llewellyn, E. J. Lorentzen, D. A. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-23-1603-2005 https://angeo.copernicus.org/articles/23/1603/2005/ eng eng doi:10.5194/angeo-23-1603-2005 https://angeo.copernicus.org/articles/23/1603/2005/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-23-1603-2005 2020-07-20T16:27:25Z An anomalous red glow due to scattered sunlight was observed at Longyearbyen (78° N, 15° E) on 6 December 2002 from 07:30UT to 13:30UT when the solar zenith angle varied between 100.7° and 104°. A model for this red sky event using sunlight scattered in a two stage process by Polar Stratospheric Clouds (PSC) at 25km is presented and demonstrated to be feasible. The model requires a significant fraction of the polar vortex, which is cold enough for the formation of ice PSC, to be occupied with PSC with an integrated vertical extinction of approximately 0.037 at 845nm. Given these conditions, the model is able to predict, within an order of magnitude, the spatial distribution of intensities measured by meridional scanning photometers located at Longyearbyen across the visible and near infra-red spectrum. Keywords. Aerosols and particles; Transmission and scattering of radiation; Polar Meteorology Text Longyearbyen Svalbard Copernicus Publications: E-Journals Longyearbyen Svalbard Annales Geophysicae 23 5 1603 1610 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
An anomalous red glow due to scattered sunlight was observed at Longyearbyen (78° N, 15° E) on 6 December 2002 from 07:30UT to 13:30UT when the solar zenith angle varied between 100.7° and 104°. A model for this red sky event using sunlight scattered in a two stage process by Polar Stratospheric Clouds (PSC) at 25km is presented and demonstrated to be feasible. The model requires a significant fraction of the polar vortex, which is cold enough for the formation of ice PSC, to be occupied with PSC with an integrated vertical extinction of approximately 0.037 at 845nm. Given these conditions, the model is able to predict, within an order of magnitude, the spatial distribution of intensities measured by meridional scanning photometers located at Longyearbyen across the visible and near infra-red spectrum. Keywords. Aerosols and particles; Transmission and scattering of radiation; Polar Meteorology |
format |
Text |
author |
Lloyd, N. D. Degenstein, D. A. Sigernes, F. Llewellyn, E. J. Lorentzen, D. A. |
spellingShingle |
Lloyd, N. D. Degenstein, D. A. Sigernes, F. Llewellyn, E. J. Lorentzen, D. A. The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds |
author_facet |
Lloyd, N. D. Degenstein, D. A. Sigernes, F. Llewellyn, E. J. Lorentzen, D. A. |
author_sort |
Lloyd, N. D. |
title |
The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds |
title_short |
The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds |
title_full |
The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds |
title_fullStr |
The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds |
title_full_unstemmed |
The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds |
title_sort |
red sky enigma over svalbard in december 2002: a model using polar stratospheric clouds |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-23-1603-2005 https://angeo.copernicus.org/articles/23/1603/2005/ |
geographic |
Longyearbyen Svalbard |
geographic_facet |
Longyearbyen Svalbard |
genre |
Longyearbyen Svalbard |
genre_facet |
Longyearbyen Svalbard |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-23-1603-2005 https://angeo.copernicus.org/articles/23/1603/2005/ |
op_doi |
https://doi.org/10.5194/angeo-23-1603-2005 |
container_title |
Annales Geophysicae |
container_volume |
23 |
container_issue |
5 |
container_start_page |
1603 |
op_container_end_page |
1610 |
_version_ |
1766064224170147840 |