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Diurnal Variation in Gravity Wave Activity at Low and Middle Latitudes : Volume 31, Issue 11 (29/11/2013)

By Andrioli, V. F.

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Book Id: WPLBN0004002297
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Diurnal Variation in Gravity Wave Activity at Low and Middle Latitudes : Volume 31, Issue 11 (29/11/2013)  
Author: Andrioli, V. F.
Volume: Vol. 31, Issue 11
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Clemesha, B. R., Batista, P. P., Andrioli, V. F., Fritts, D. C., & Janches, D. (2013). Diurnal Variation in Gravity Wave Activity at Low and Middle Latitudes : Volume 31, Issue 11 (29/11/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Instituto Nacional de Pesquisas Espaciais – INPE, São José dos Campos, SP, Brazil. We employ a modified composite day extension of the Hocking (2005) analysis method to study gravity wave (GW) activity in the mesosphere and lower thermosphere using 4 meteor radars spanning latitudes from 7° S to 53.6° S. Diurnal and semidiurnal modulations were observed in GW variances over all sites. Semidiurnal modulation with downward phase propagation was observed at lower latitudes mainly near the equinoxes. Diurnal modulations occur mainly near solstice and, except for the zonal component at Cariri (7° S), do not exhibit downward phase propagation. At a higher latitude (SAAMER, 53.6° S) these modulations are only observed in the meridional component where we can observe diurnal variation from March to May, and semidiurnal, during January, February, October (above 88 km) and November. Some of these modulations with downward phase progression correlate well with wind shear. When the wind shear is well correlated with the maximum of the variances the diurnal tide has its largest amplitudes, i.e., near equinox. Correlations exhibiting variations with tidal phases suggest significant GW-tidal interactions that have different characters depending on the tidal components and possible mean wind shears. Modulations that do not exhibit phase variations could be indicative of diurnal variations in GW sources.

Summary
Diurnal variation in gravity wave activity at low and middle latitudes

Excerpt
Andrioli, V. F., Clemesha, B. R., Batista, P. P., and Schuch, N. J.: Atmospheric tides and mean winds in the meteor region over Santa Maria (29.7° S; 53.8° W), J. Atmos. Sol.-Terr. Phy., 71, 1864–1876, doi:10.1016/j.jastp.2009.07.005, 2009.; Andrioli, V. F., Fritts, D. C., Batista, P. P., and Clemesha, B. R.: Improved analysis of all-sky meteor radar measurements of gravity wave variances and momentum fluxes, Ann. Geophys., 31, 889–908, doi:10.5194/angeo-31-889-2013, 2013.; Antonita, T. M., Ramkumar, G., Kumar, K. K., and Deepa, V.: Meteor wind radar observations of gravity wave momentum fluxes and their forcing toward the Mesospheric Semiannual Oscillation, J. Geophys. Res., 113, doi:10.1029/2007JD009089, 2008.; Batista, P. P., Clemesha, B. R., Tokumoto, A. S., and Lima, L. M.: Structure of the mean winds and tides in the meteor region over Cachoeira Paulista, Brazil (22.7° S; 45° W) and its comparison with models, J. Atmos. Sol.-Terr. Phys., 66, 623–636, doi:10.1016/j.jastp.2004.01.007, 2004.; Beldon, C. L. and Mitchell, N. J.: Gravity wave-tidal interactions in the mesosphere and lower thermosphere over Rothera, Antarctica (68° S, 68° W), J. Geophys. Res., 115, D18101, doi:10.1029/2009JD013617, 2010.; Buriti, R. A., Hocking, W. K., Batista, P. P., Medeiros, A. F., and Clemesha, B. R.: Observations of equatorial mesospheric winds over Cariri (7.4° S) by a meteor radar and comparison with existing models, Ann. Geophys., 26, 485–497, doi:10.5194/angeo-26-485-2008, 2008.; Clemesha, B. R. and Batista, P. P.: Gravity waves and wind-shear in the MLT at 23° S, Adv. Space Res., 41, 1471–1476, doi:10.1016/j.jastp.2008.01.013, 2008.; Clemesha, B. R., Batista, P. P., Buriti da Costa, R. A., and Schuch, N.: Seasonal variations in gravity wave activity at three locations in Brazil, Ann. Geophys., 27, 1059–1065, doi:10.5194/angeo-27-1059-2009, 2009.; Forbes, J. M., Gu, J., and Miyahara, S.: On the interactions between gravity waves and the diurnal tide, Planet. Space Sci., 39, 1246–1257, 1991.; Fritts, D. and Alexander, M. J.: Gravity wave dynamics and effects in the middle atmosphere, Rev. Geophys, 41, 3.1–3.64, doi:10.1029/2001RG000106, 2003.; Fritts, D. C. and Vincent, R. A.: Mesospheric momentum flux studies at Adelaide, Australia: Observations and a gravity wave/tidal interaction model, J. Atmos. Sci., 44, 605–619, 1987.; Fritts, D. C., Janches, D., and Hocking, W. K.: Southern Argentina Agile Meteor Radar: Initial assessment of gravity wave momentum fluxes, J. Geophys. Res., 115, D19123, doi:10.1029/2010JD013891, 2010.; Fritts, D. C., Janches, D., Hocking, W. K., Bageston, J. V., and Leme, N. M. P.: Drake Antarctic Agile Meteor Radar (DrAAMER) First Results: Configuration and Comparison of Mean and Tidal Wind and Gravity Wave Momentum Flux Measurements with SAAMER, J. Geophs. Res., 117, D02105, doi:10.1029/2011JD016651, 2012a.; Fritts, D. C., Janches, D., Hocking, W. K., Mitchell, N. J., and Taylor, M. J.: Assessment of gravity wave momentum flux measurement capabilities by meteor radars having different transmitter power and antenna configurations, J. Geophys. Res., 117, D10108, doi:10.1029/2011JD017174, 2012b.; Hocking, W. K.: A new approach to momentu

 

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