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Characteristics and Sources of Gravity Waves Observed in Noctilucent Cloud Over Norway : Volume 14, Issue 22 (18/11/2014)

By Demissie, T. D.

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Book Id: WPLBN0003993511
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Characteristics and Sources of Gravity Waves Observed in Noctilucent Cloud Over Norway : Volume 14, Issue 22 (18/11/2014)  
Author: Demissie, T. D.
Volume: Vol. 14, Issue 22
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description: Norwegian University of Science and Technology (NTNU), Department of Physics, Trondheim, Norway. 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 ray-tracing 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.

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

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