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Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S
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| Zeitschriftentitel: | Annales Geophysicae |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Annales Geophysicae, 32, 2014, 5, S. 519-531 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Copernicus GmbH
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| Schlagwörter: |
| author_facet |
Araújo, L. R. Lima, L. M. Batista, P. P. Clemesha, B. R. Takahashi, H. Araújo, L. R. Lima, L. M. Batista, P. P. Clemesha, B. R. Takahashi, H. |
|---|---|
| author |
Araújo, L. R. Lima, L. M. Batista, P. P. Clemesha, B. R. Takahashi, H. |
| spellingShingle |
Araújo, L. R. Lima, L. M. Batista, P. P. Clemesha, B. R. Takahashi, H. Annales Geophysicae Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
| author_sort |
araújo, l. r. |
| spelling |
Araújo, L. R. Lima, L. M. Batista, P. P. Clemesha, B. R. Takahashi, H. 1432-0576 Copernicus GmbH Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics http://dx.doi.org/10.5194/angeo-32-519-2014 <jats:p>Abstract. 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. </jats:p> Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S Annales Geophysicae |
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10.5194/angeo-32-519-2014 |
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Online Free |
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Physik Technik Geologie und Paläontologie Geographie |
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ElectronicArticle |
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Copernicus GmbH, 2014 |
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| title |
Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_unstemmed |
Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_full |
Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_fullStr |
Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_full_unstemmed |
Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_short |
Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_sort |
planetary wave seasonality from meteor wind measurements at 7.4° s and 22.7° s |
| topic |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.5194/angeo-32-519-2014 |
| publishDate |
2014 |
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519-531 |
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<jats:p>Abstract. 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.
</jats:p> |
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| author | Araújo, L. R., Lima, L. M., Batista, P. P., Clemesha, B. R., Takahashi, H. |
| author_facet | Araújo, L. R., Lima, L. M., Batista, P. P., Clemesha, B. R., Takahashi, H., Araújo, L. R., Lima, L. M., Batista, P. P., Clemesha, B. R., Takahashi, H. |
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| description | <jats:p>Abstract. 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. </jats:p> |
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| imprint_str_mv | Copernicus GmbH, 2014 |
| institution | DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15 |
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| spelling | Araújo, L. R. Lima, L. M. Batista, P. P. Clemesha, B. R. Takahashi, H. 1432-0576 Copernicus GmbH Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics http://dx.doi.org/10.5194/angeo-32-519-2014 <jats:p>Abstract. 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. </jats:p> Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S Annales Geophysicae |
| spellingShingle | Araújo, L. R., Lima, L. M., Batista, P. P., Clemesha, B. R., Takahashi, H., Annales Geophysicae, Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geology, Astronomy and Astrophysics |
| title | Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_full | Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_fullStr | Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_full_unstemmed | Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_short | Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| title_sort | planetary wave seasonality from meteor wind measurements at 7.4° s and 22.7° s |
| title_unstemmed | Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S |
| topic | Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geology, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.5194/angeo-32-519-2014 |