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Characteristics and sources of gravity waves observed in noctilucent cloud over Norway

Authors :
Gerd Baumgarten
N. H. Kleinknecht
Teferi Demissie
M. Hatlen
Natalie Kaifler
Patrick J. Espy
Source :
Atmospheric Chemistry and Physics, Vol 14, Iss 22, Pp 12133-12142 (2014), 12133-12142, Atmospheric Chemistry And Physics
Publication Year :
2014
Publisher :
Copernicus Publications, 2014.

Abstract

Four years of noctilucent cloud (NLC) images from an automated digital camera in Trondheim and results from a ray-tracing model are used to extend the climatology of gravity waves to higher latitudes and to identify their sources during summertime. The climatology of the summertime gravity waves detected in NLC between 64 and 74 N is similar to that observed between 60 and 64 N by Pautet et al. (2011). The direction of propagation of gravity waves observed in the NLC north of 64 N is a continuation of the north and northeast propagation as observed in south of 64 N. However, a unique population of fast, short wavelength waves propagating towards the SW is observed in the NLC, which is consistent with transverse instabilities generated in situ by breaking gravity waves (Fritts and Alexander, 2003). The relative amplitude of the waves observed in the NLC Mie scatter have been combined with raytracing results to show that waves propagating from near the tropopause, rather than those resulting from secondary generation in the stratosphere or mesosphere, are more likely to be the sources of the prominent wave structures observed in the NLC. The coastal region of Norway along the latitude of 70 N is identified as the primary source region of the waves generated near the tropopause. © Author(s) 2014. This work is distributed under the Creative Commons Attribution 3.0 License.

Details

Language :
English
ISSN :
16807324 and 16807316
Volume :
14
Issue :
22
Database :
OpenAIRE
Journal :
Atmospheric Chemistry and Physics
Accession number :
edsair.doi.dedup.....9b732a7393a9014c7a9f24b610d7a53a