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Planetary Wave Seasonality from Meteor Wind Measurements at 7.4° S and 22.7° S : Volume 32, Issue 5 (22/05/2014)

By Araújo, L. R.

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Book Id: WPLBN0004002457
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Planetary Wave Seasonality from Meteor Wind Measurements at 7.4° S and 22.7° S : Volume 32, Issue 5 (22/05/2014)  
Author: Araújo, L. R.
Volume: Vol. 32, Issue 5
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Batista, P. P., Clemesha, B. R., Lima, L. M., Araújo, L. R., & Takahashi, H. (2014). Planetary Wave Seasonality from Meteor Wind Measurements at 7.4° S and 22.7° S : Volume 32, Issue 5 (22/05/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: PPGCTA-CCT, Universidade Estadual da ParaÍba, UEPB, 58.109-790, Campina Grande – PB, Brazil. In this study we have used wind observation data from the mesosphere and lower thermosphere (MLT) region, obtained from meteor radar measurements in São João do Cariri (7.4° S, 36.5° W) from July 2004 to December 2008 and in Cachoeira Paulista (22.7° S, 45.0° W) from January 2002 to July 2006 and from September 2007 to November 2008. From the spectral analysis it was possible to identify the presence of planetary-scale oscillations in the hourly winds for the two latitudes and to study their transient character, which allowed elaboration of a climatology of planetary oscillation signatures. Planetary waves with periods near 2-days, 6–7 days, and 16 days were focussed on in this study. The quasi-2-day waves in the meteoric winds showed a seasonal cycle, with intense amplitudes occurring after the austral summer solstice and extending until the end of the season. The vertical wavelengths of the 2-day wave over Cachoeira Paulista were larger than those at São João do Cariri. A possible modulation of the quasi-2-day wave amplitudes by the quasi-biennial oscillation (QBO) has been observed only at São João do Cariri. The 6–7 day oscillations presented more intense amplitudes during August–November but were present with lower amplitudes during March–April at both sites. The 6–7 day vertical wavelengths over São João do Cariri were larger than at Cachoeira Paulista. The 6–7 day amplitudes exhibited intra-seasonal and annual behavior, however, there was no clear evidence of QBO modulation. The 16-day oscillations showed a seasonal cycle at São João do Cariri, with amplifications from austral spring to mid-summer and weaker amplitudes from autumn until early winter, however, there was no clear seasonality over Cachoeira Paulista. The 16-day vertical wavelengths have assumed values of Λz ~ 45–85 km over both sites. 16-day wave amplitudes at the two sites showed different long-term behaviors.

Summary
Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S

Excerpt
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. Terr. Phys., 66, 623–636, doi:10.1016/j.jastp.2004.01.014, 2004.; Charney, J. G. and Drazin, P. G.: Propagation of planetary-scale disturbances from the lower into the upper atmosphere, J. Geophys. Res., 66, 83–109, doi:10.1029/JZ066i001p00083, 1961.; Clark, R. R., Current, A. C., Manson, A. H., Meek, C. E., Avery, S. K., Palo, S. E., and Aso, T.: Hemispheric properties of the 2-day wave from mesosphere lower-thermosphere radar observations, J. Atmos. Terr. Phys., 56, 1279–1288, doi:10.1016/0021-9169(94)90066-3, 1994.; Craig, R. L. and Elford, W. G.: Observations of the quasi 2-day wave near 90 km altitude at Adelaide (35° S), J. Atmos. Terr. Phys., 41, 1051–1056, doi:10.1016/0021-9169(81)90019-2, 1981.; Day, K. A., Hibbins, R. E., and Mitchell, N. J.: Aura MLS observations of the westward-propagating s = 1, 16-day planetary wave in the stratosphere, mesosphere and lower thermosphere, Atmos. Chem. Phys., 11, 4149–4161, doi:10.5194/acp-11-4149-2011, 2011.; Espy, P. J., Stegman, J., and Witt, G.: Interannual variations of the quasi-16-day oscillation in the polar summer mesospheric temperature, J. Geophys. Res., 102, 1983–1990, doi:10.1029/96JD02717, 1997.; Forbes, J. M.: Tidal and planetary waves, in The Upper Mesosphere and Lower Thermosphere: A Review of Experiment and Theory, edited by: Johnson, R. M. and Killeen, T. L., AGU, Washington, D.C., 87, 67–87, doi:10.1029/GM087p0067, 1995.; Forbes, J. M., Hagan, M., Miyahara, S., Vial, F., Manson, A. H., Meek, C. E., and Portnyagin, Y. I.: Quasi 16-day oscillation in the mesosphere and lower thermosphere, J. Geophys. Res., 100, 9149–9163, doi:10.1029/94JD02157, 1995.; Gurubaran, S., Sridharan, S., Ramkumar, T. K., and Rajaram, R.: The mesospheric quasi-2-day wave over Tirunelveli (8.7° N), J. Atmos. Terr. Phys., 63, 975–985, doi:10.1016/S1364-6826(01)00016-5, 2001.; Harris, T. J. and Vincent, R. A: The quasi-two-day wave observed in the equatorial middle atmosphere, J. Geophys. Res., 98, 10481–10490, doi:10.1029/93JD00380, 1993.; Huang, Y. Y., Zhang, S. D., Yi, F., Huang, C. M., Huang, K. M., Gan, Q., and Gong, Y.: Global climatological variability of quasi-two-day waves revealed by TIMED/SABER observations, Ann. Geophys., 31, 1061–1075, doi:10.5194/angeo-31-1061-2013, 2013.; Jacobi, C.: On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements, Ann. Geophys., 16, 1534–1543, doi:10.1007/s00585-998-1534-3, 1998.; Jiang, G., Xu, J., Xiong, J., Ma, R., Ning, B., Murayama, Y., Thorsen, D., Gurubaran, S., Vincent, R. A., Reid, I., and Franke, S. J.: A case study of the mesospheric 6.5-day wave observed by radar systems, J. Geophys. Res., 113, D16111, doi:10.1029/2008JD009907, 2008.; Jiang, G.-Y., Xiong, J.-G., Wan, W.-X., Ning, B.-Q., Liu, L.-B., Vincent, R. A., and Reid, I.: The 16-day waves in the mesosphere and lower thermosphere over Wuhan (

 

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