Meteor wind radar observations of tidal amplitudes over a low-latitude station Trivandrum (8.5°N, 77°E): Interannual variability and the effect of background wind on diurnal tidal amplitudes

Deepa, V.; Ramkumar, Geetha; Antonita, T. Maria; Kumar, Karanam Kishore

doi:10.1016/j.jastp.2008.07.017

Cited by 13 publications

(21 citation statements)

References 45 publications

(76 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Semidiurnal tide is smaller than diurnal tide in the whole, and its amplitude is particularly strong in the meridional wind with the maximum about 53 m/s. Our results are basically consistent with the studies of Guo and Lehmacher [14] and Deepa et al [15], but diurnal tide over Fuke is larger than the tide over Jicamarca (11.95°S,76.87°W) and Trivandrum (8.51°N, 771°E). In fact, the classical theory of atmospheric tides has indicated that the (1, 1) mode of diurnal tide has the maximum near ±20° latitude.…”

Section: Diurnal Tide and Semidiurnal Tidesupporting

confidence: 93%

“…So, diurnal tide has an upward energy flux, in other words, the diurnal tide at 80 100 km comes from the lower atmosphere. This result is consistent with other studies [12,14,15,23]. Now, let us focus on the vertical variation of the amplitude of diurnal tide.…”

Section: The Comparison Between the Observation And Gswm02supporting

confidence: 92%

“…By using the wind observed by meteor radar systems located at Jicamarca (11.95°S, 76.87°W) and Trivandrum (8.51°N, 771°E), Guo and Lehmacher [14] and Deepa et al [15] studied the diurnal tide and semidiurnal tide in the height range of 80 100 km. The results of their studies also show that diurnal tide is the largest wave among the atmospheric tides in the MLT region at low latitude; diurnal tide has a distinct semiannual variation (the maximum amplitude occurs near equinoxes), and its meridional component is larger than the zonal component.…”

Section: Diurnal Tide and Semidiurnal Tidementioning

confidence: 99%

“…Generally, the tides with periods of one day or its submultiples are the most significant atmospheric waves in the MLT region, and they usually have global scale features, large amplitudes and long duration, so atmospheric tides are the dominant wave of the dynamics of the MLT region. Now, there are a few main results about the study of the tides in the MLT region at equatorial and low-latitude: (1) among the solar tides, diurnal tide has the largest amplitude, and its meridional component is stronger than zonal component [14,15]; (2) the variations of tidal phases with altitude indicate that they have upward energy flux and come from the lower atmosphere [12 15]; (3) the variation of diurnal tide shows semiannual, annual and quasi-biannual signal. The largest amplitudes of diurnal tide usually occur in equinox months.…”

mentioning

confidence: 99%

“…The largest amplitudes of diurnal tide usually occur in equinox months. The quasi-biannual variation of diurnal tide is possibly correlative with the quasi-biannual oscillation of the upper stratosphere over equator [15,16]; and (4) besides the long-term variabilities, the amplitudes and phases of diurnal tide also have short-term variabilities [17].…”

mentioning

confidence: 99%

See 4 more Smart Citations

The first observation of the atmospheric tides in the mesosphere and lower thermosphere over Hainan, China

Jiang

Shi

et al. 2010

Chin. Sci. Bull.

View full text Add to dashboard Cite

we first present the variation of the atmospheric diurnal tide, semidiurnal tide and mean wind in the height range 80 100 km over the low latitudes of China. The results from our analysis are summarized below. During spring months, there are quite strong tides in the mesopause region of Fuke. The diurnal tidal amplitude is significantly larger than the amplitude of semidiurnal tide, and the maximum amplitude (about 100 m/s) of diurnal tide appear in the meridional wind. The vertical phases of both diurnal tide and semidiurnal tide propagate downward. In addition, the observed tides are compared with the linear tide model (Global Scale Wave Model, GSWM02), and the results show that Fuke diurnal tide agrees well with the model, but there are many differences between Fuke semidiurnal tide and the results from model. meteor radar, mesosphere and lower thermosphere, tides Citation: Jiang G Y, Xu J Y, Shi J K, et al. The first observation of the atmospheric tides in the mesosphere and lower thermosphere over Hainan

show abstract

Section: Diurnal Tide and Semidiurnal Tidesupporting

confidence: 93%

Section: The Comparison Between the Observation And Gswm02supporting

confidence: 92%

Section: Diurnal Tide and Semidiurnal Tidementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

The first observation of the atmospheric tides in the mesosphere and lower thermosphere over Hainan, China

Jiang

Shi

et al. 2010

Chin. Sci. Bull.

View full text Add to dashboard Cite

show abstract

Atmospheric tides in the low‐latitude E and F regions and their responses to a sudden stratospheric warming event in January 2010

2013

View full text Add to dashboard Cite

[1] An extensive analysis of atmospheric tides in the low-latitude thermosphere and their responses to a major sudden stratospheric warming (SSW) event (18-23 January 2010) is presented. The analysis is based on observational data from the Arecibo dual-beam incoherent scatter radar. Important findings of the present study are as follows. (1) The diurnal tide with an evanescent phase structure dominates the F region meridional wind field. The diurnal tide has a peak amplitude of 45 m/s occurring at about 245 km, and it is very stable throughout the nine consecutive days' observation. Below 114 km, the vertical structures of the diurnal tide in the meridional and zonal components are consistent, which resemble the classical solar S 1, 1 tidal mode. (2) The F region semidiurnal tide is much weaker and has larger day-to-day variability than the diurnal tide. In the E region, the semidiurnal amplitudes in the meridional and zonal components grow continuously in the altitude ranges from 106 to 121 km and from 100 to 115 km, respectively. The vertical wavelength of the zonal component is estimated to be 45 km above 100 km, which is close to the solar S 2, 4 and S 2, 5 tidal modes. (3) The semidiurnal and terdiurnal tides respond strongly to the SSW while the impact that the SSW has on the diurnal tide in the meridional wind is limited. During the SSW event, the amplitudes of the semidiurnal and terdiurnal tides are enhanced in the F region but reduced in the upper E region.

show abstract

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

Wan

Ren

et al. 2015

JGR Space Physics

View full text Add to dashboard Cite

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.

show abstract

Meteor wind radar observations of tidal amplitudes over a low-latitude station Trivandrum (8.5°N, 77°E): Interannual variability and the effect of background wind on diurnal tidal amplitudes

Cited by 13 publications

References 45 publications

The first observation of the atmospheric tides in the mesosphere and lower thermosphere over Hainan, China

The first observation of the atmospheric tides in the mesosphere and lower thermosphere over Hainan, China

Atmospheric tides in the low‐latitude E and F regions and their responses to a sudden stratospheric warming event in January 2010

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

Contact Info

Product

Resources

About