The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Annales Geophysicae Année : 2005

The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds

Résumé

An anomalous red glow due to scattered sunlight was observed at Longyearbyen (78° N, 15° E) on 6 December 2002 from 07:30 UT to 13:30 UT 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

Fichier principal
Vignette du fichier
angeo-23-1603-2005.pdf (497.32 Ko) Télécharger le fichier
Origine Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-00317813 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00317813 , version 1

Citer

N. D. Lloyd, D. A. Degenstein, F. Sigernes, E. J. Llewellyn, D. A. Lorentzen. The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds. Annales Geophysicae, 2005, 23 (5), pp.1603-1610. ⟨hal-00317813⟩

Collections

INSU EGU
88 Consultations
102 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More