Terdiurnal tides in MLT region over Cachoeira Paulista (22.7° S; 45° W)

Tokumoto, Aparecido S.; Batista, P. P.; Clemesha, B. R.

doi:10.1190/sbgf2005-448

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…[2009] reported that at low latitudes the maximum amplitudes of the terdiurnal tide are seen during equinoxes, with a primary peak in March and a secondary peak in October. A similar result was obtained at a low‐latitude Southern Hemisphere station at Cachoeira Paulista, Brazil (22.7°S, 45°W), where the maximum of the terdiurnal tide occurs during equinoxes (mainly during February‐March) [ Batista et al , 2004; Tokumoto et al , 2007]. Based on wind measurements by a High‐Resolution Doppler Interferometer (HRDI) housed on the Upper Atmosphere Research Satellite (UARS), Smith [2000] found that the maximum amplitudes at midlatitudes occur during winter and fall equinox.…”

Section: Introductionsupporting

confidence: 60%

On the occurrence and variability of the terdiurnal tide in the equatorial mesosphere and lower thermosphere and a comparison with the Kyushu-GCM

Rao¹,

Tsuda²,

Gurubaran³

et al. 2011

J. Geophys. Res.

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[1] We studied the occurrence characteristics and variability of the terdiurnal tide (8 hour period) in the equatorial mesosphere and lower thermosphere (MLT), using a meteor radar at Koto Tabang (0.2°S, 100.3°E) and MF radars at Tirunelveli (8.7°N, 77.8°E) and Pameungpeuk (7.4°S, 107.4°E). These locations, one being located right over the equator and the other two at conjugate points around the equator within ±10°, form a unique experimental setup to study equatorial MLT dynamics. The terdiurnal tide exists as a distinct wave signature at all three locations. While the daily amplitudes can be as large as 15 m s −1 , the monthly mean amplitudes lie between 1 and 10 m s −1 . The amplitude of the terdiurnal tide at Pameungpeuk is generally smaller than that observed at Tirunelveli and Koto Tabang. The seasonal variation in amplitude shows both annual and semiannual oscillations of ∼1 m s −1 at all three locations. The present observations combined with previous reports indicate that the timing of the primary maximum of the terdiurnal tide amplitude shifts from autumn to late spring and early summer as one moves from high latitudes to the equator (all with respect to the Northern Hemisphere). The amplitudes and seasonal variation in the present observations show good comparison with that simulated by the General Circulation Model (GCM) developed by Kyushu University, Japan. This study supports the occurrence of nonlinear interaction between diurnal and semidiurnal tides and shows that gravity waves play an important role in the generation of the terdiurnal tide.Citation: Venkateswara Rao, N., T. Tsuda, S. Gurubaran, Y. Miyoshi, and H. Fujiwara (2011), On the occurrence and variability of the terdiurnal tide in the equatorial mesosphere and lower thermosphere and a comparison with the Kyushu-GCM,

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Section: Introductionsupporting

confidence: 60%

On the occurrence and variability of the terdiurnal tide in the equatorial mesosphere and lower thermosphere and a comparison with the Kyushu-GCM

Rao¹,

Tsuda²,

Gurubaran³

et al. 2011

J. Geophys. Res.

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“…and latent heat release. Seasonal and interannual variability of the most dominant tides, i.e., diurnal, semidiurnal and terdiurnal in the middle atmosphere, have been studied with the help of models and observations by various investigators for the last couple of decades over the globe (Forbes, 1982;Vial et al, 1991;Tokumoto et al, 2007;Guharay and Franke, 2011;Guharay et al, 2013a). In general the semidiurnal tide is stronger than the diurnal tide at high latitude and at tropical latitude the diurnal tide predominates.…”

Section: Introductionmentioning

confidence: 98%

On the variability of the diurnal tide and coupling with planetary waves in the MLT over Cachoeira Paulista (22.7°S, 45°W)

Guharay

Batista

Clemesha

2015

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Apparent AO with maximum amplitude in autumn, in winter and autumn, as well as in winter and spring mainly at high latitude (e.g., Esrange, 68°N, 21°E), higher midlatitude (e.g., Eaton, UK, 52.6°N, 2.2°W), and lower midlatitude (e.g., Garchy, 47°N, 3°E; Montpazier, 44°N, 1°E; London, Canada, 43°N, 81°W) stations was demonstrated in the preceding investigations [e.g., Thayaparan , ; Smith , ; Younger et al , ; Aso , ; Beldon et al , ; Jiang et al , ]. By contrast, at the low‐latitude stations (e.g., Cachoeira Paulista, 22.7°S, 45°W; Maui, 20.75°N, 156.43°W), prominent SAO with maxima near equinoxes was found [ Batista et al , ; Tokumoto et al , ]. Near the equator (e.g., Koto Tabang, 0.2°S, 100.3°E; Triunelveli, 8.7°N, 77.8°E; and Pameungpeuk, 7.4°N, 107.4°E), both AO and SAO were shown in terdiurnal components [ Venkateswara Rao et al , ; Yue et al , ].…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations of MLT tides revealed by a meteor radar chain based on Hough mode decomposition

Wan

Ren

et al. 2015

JGR Space Physics

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Seasonal variations of different tides in the mesosphere and lower thermosphere are investigated from wind observations of a meteor radar chain on the basis of Hough mode decomposition. First, the observed winds are decomposed into different (diurnal, semidiurnal, and terdiurnal) tidal components. Different seasonal patterns are revealed for each component. Pronounced semiannual oscillation (SAO) is presented in the diurnal component, while latitude‐dependent seasonal variation is found in the semidiurnal and terdiurnal components. At the low/midlatitude stations, the semiannual/annual oscillation is relatively stronger. Then, Hough mode decomposition is utilized to extract the dominant tidal modes of each decomposed component. It is found that each component is dominated by one of its symmetric tidal modes with strong seasonal dependency. Apparent SAO is observed in the dominant (1, 1) mode; (2, 4) mode is strong in the autumn and winter months (after the September equinox). Based on the extracted results we further map the three‐dimensional distribution (latitude × altitude × season) of each tidal component. The mapped results are finally compared with the corresponding values observed by the Thermosphere Ionosphere Mesosphere Energetics and Dynamics Doppler Interferometer (TIDI) and modeled from the global scale wave model (GSWM). Each mapped tidal component agrees well with corresponding TIDI observation in the seasonal variation. Meanwhile, coincidences are found in the seasonal dependency of the diurnal component between the mapped values and the modeled results from GSWM, while difference between them exists in that of the semidiurnal one.

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Terdiurnal tides in MLT region over Cachoeira Paulista (22.7° S; 45° W)

Cited by 6 publications

References 12 publications

On the occurrence and variability of the terdiurnal tide in the equatorial mesosphere and lower thermosphere and a comparison with the Kyushu-GCM

On the occurrence and variability of the terdiurnal tide in the equatorial mesosphere and lower thermosphere and a comparison with the Kyushu-GCM

On the variability of the diurnal tide and coupling with planetary waves in the MLT over Cachoeira Paulista (22.7°S, 45°W)

Seasonal variations of MLT tides revealed by a meteor radar chain based on Hough mode decomposition

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