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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
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
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.

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

Excerpt
Baumgarten, G., Fiedler, J., Fricke, K. H., Gerding, M., Hervig, M., Hoffmann, P., Müller, N., Pautet, P.-D., Rapp, M., Robert, C., Rusch, D., von Savigny, C., and Singer, W.: The noctilucent cloud (NLC) display during the ECOMA/MASS sounding rocket flights on 3 August 2007: morphology on global to local scales, Ann. Geophys., 27, 953–965, doi:10.5194/angeo-27-953-2009, 2009a.; Baumgarten, G., Gerding, M., Kaifler, B., and Müller, N.: A trans-European network of cameras for observation of noctilucent clouds from 37° N to 69° N, Proceedings 19th ESA Symposium on European Rocket and Ballon Programmes and Related Research, Bad Reichenhall, Germany, 7–11 June 2009, 2009b.; Chandran, A., Rusch, D. W., Palo, S. E., Thomas, G. E., and Taylor, M. J.: Gravity wave observations in the summertime polar mesosphere from the cloud imaging and particle size (CIPS) experiment on the AIM spacecraft, J. Atmos. Sol.-Terr. Phys., 71, 285–288, 2009.; Chandran, A., Rusch, D. W., Merkel, A. W., Palo, S. E., Thomas, G. E., Taylor, M. J., Bailey, S. M., and Russell III, J. M.: Polar Mesospheric Cloud structures observed from the CIPS experiment on the AIM spacecraft: atmospheric gravity waves as drivers for longitudinal variability in PMC occurrence, J. Geophys. Res., 115, D13102, doi:10.1029/2009JD013185, 2010.; Eckermann, S. D.: Ray-tracing simulation of the global propagation of inertia gravity waves through the zonally averaged middle atmosphere, J. Geophys. Res. , 97 , 15849–15866, doi:10.1029/92JD01410, 1992.; Eckermann, S. D. and Marks C. J.: GROGRAT: A new model of the global propagation and dissipation of atmospheric gravity waves, Adv. Space Res. 20, 1253–1256, 1997.; Ejiri, M. K., Shiokawa, K., Ogawa, T., Igarashi, K., Nakamura, T., and Tsuda, T.: Statistical study of short-period gravity waves in OH and OI nightglow images at two separated sites, J. Geophys. Res., 108, 4679, doi:10.1029/2002JD002795, 2003.; Espy, P. J. and Stegman, J.: Trends and variability of mesospheric temperature at high-latitudes, Phys. Chem. Earth, 27, 543–553, 2002.; Espy, P. J., Jones, G. O. L., Swenson, G. R., Tang, J., and Taylor, M. J.: Seasonal variations of the gravity-wave momentum flux in the Antarctic mesosphere and lower thermosphere, J. Geophys. Res., 109, D23109, doi:10.1029/2003JD004446, 2004.; Espy, P. J., Hibbins, R. E., Swenson, G. R., Tang, J., Taylor, M. J., Riggin, D. M., and Fritts, D. C.: Regional variations of mesospheric gravity-wave momentum flux over Antarctica, Ann. Geophys., 24, 81–88, doi:10.5194/angeo-24-81-2006, 2006.; Fiedler, J., Baumgarten, G., and Lübken, F. -J.: NLC observations during one solar cycle above ALOMAR, J. Atmos. Sol.-Terr. Phys., 71, 424, 2009.; Fritts, D. C. and Alexander, M. J.: Gravity wave dynamics and effects in the middle atmosphere, Rev. Geophys., 41, 1003, doi:10.1029/2001RG000106, 2003.; Fritts, D. C. and Luo, Z. G.: Dynamical and radiative forcing of the summer mesopause circulation and thermal structure: 1. Mean solstice conditions, J. Geophys. Res., 100, 3119–3128, 1995.; Holton, J. R.: The role of gravity wave induced drag and diffusion in the momentum budget of the mesosphere, J. Atmos. Sci., 39, 791–799, 1982.; Fritts, D. C., Isler, J. R., Thomas, G. E., and Andreassen, Ø: Wave breaking signatures in noctilucent clouds, Geophys. Res. Lett., 20, 2039–2042, doi:10.1029/93GL01982, 1993.; Gadsden, M. and Schröder, M.: Noctilucent Clouds, Springer-Verlag, Berlin, 165 pp., 1989.; Garcia, R. G. and Solomon, S.:

 

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