Semidiurnal tides from the extended Canadian Middle Atmosphere Model (CMAM) and comparisons with TIMED Doppler interferometer (TIDI) and meteor radar observations

Du, J.; Ward, W. E.; Oberheide, J.; Nakamura, Takuji; Tsuda, Toshitaka

doi:10.1016/j.jastp.2007.07.014

Cited by 36 publications

(60 citation statements)

References 45 publications

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“…In the case of comparisons of eCMAM with observations, it has been noted in previous studies that the amplitudes of the eastward-propagating tidal components in eCMAM are much larger than the values observed by the TIMED Doppler Interferometer (TIDI), while westward propagating components are of comparable magnitudes (Du et al, 2007;Du, 2008;Chang et al, 2010). It is therefore possible that eCMAM overestimates the parameterizations of latent heat release and deep convection responsible for generating the eastward-propagating tidal components.…”

Section: Discussionmentioning

confidence: 94%

“…There are two large gaps in In this study we will make use of two models: eCMAM and WACCM. The extended CMAM, or eCMAM (Fomichev et al, 2002;Du et al, 2007), extends from the surface to heights of about 210 km. The governing equations are solved in spectral space with triangular truncations at wavenumber 32 (T32), which corresponds to a horizontal grid of approximately 6.0 • × 6.0 • near the Equator.…”

Section: Data and Analysismentioning

confidence: 99%

“…The monthly-mean amplitudes and phases of each tide were calculated by using vector averaging in the same manner as the radar analysis. Refer to Du et al (2007) for more details on this data analysis method.…”

Section: Data and Analysismentioning

confidence: 99%

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The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

et al. 2013

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The diurnal zonal vertical wavelengths are similar to the meridional, except for the winter months when the zonal vertical wavelengths are much longer, occasionally exceeding 100 km. Semidiurnal amplitudes are observed to be significantly smaller than diurnal amplitudes. Semidiurnal vertical wavelengths range from 20 to more than 100 km. Our observations of tidal amplitudes and phases are compared with the predictions of the extended Canadian Middle Atmosphere Model (eCMAM) and the Whole Atmosphere Community Climate Model (WACCM). Both eCMAM and WACCM reproduce the trend for greater diurnal amplitudes in the meridional component than the zonal. However, eCMAM tends to overestimate meridional amplitudes, while WACCM underestimates both zonal and meridional amplitudes. Vertical wavelength predictions are generally good for both models; however, eCMAM predicts shorter diurnal zonal vertical wavelengths than are observed in winter, while WACCM predicts longer zonal vertical wavelengths than observed for the semidiurnal tide for most months. Semidiurnal amplitude predictions are generally good for both models. It is found that larger-than-average diurnal and semidiurnal tidal amplitudes occur when the stratospheric quasi-biennial oscillation (QBO) at 10 hPa is eastwards, and smaller-than-average amplitudes occur when it is westwards. Correlations between the amplitude perturbations and the El Niño Southern Oscillation are also found. The precise mechanism for these correlations remains unclear.

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Section: Discussionmentioning

confidence: 94%

Section: Data and Analysismentioning

confidence: 99%

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The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

et al. 2013

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“…The seasonal features of the migrating and nonmigrating semidiurnal tides from the extended CMAM were reported by Du et al (2007). The authors showed that at 95 km height and at 50 • N the main maximum is the winter one reaching amplitudes of 35-40 m/s, while the September maximum is only 20-25 m/s.…”

Section: Seasonal Features Of Semidiurnal Tide Observed By Mf and Metmentioning

confidence: 82%

“…While the measured semidiurnal characteristics are presented in the altitude range of 60-97 km strangely those of the model tide is shown only up to 88 km height. It is known that the upward extension of the standard CMAM is to 95 km, while that of the extended CMAM -to ∼210 km (Du et al, 2007). Therefore, the model results should be shown at least up to 95 km height.…”

Section: Seasonal Features Of Semidiurnal Tide Observed By Mf and Metmentioning

confidence: 94%

Reply to Comment on "Global structure, seasonal and interannual variability of the migrating semidiurnal tide seen in the SABER/TIMED temperatures (2002–2007)" by Manson et al. (2010)

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The character of polar tidal signatures in the extended Canadian Middle Atmosphere Model

Ward

Cooper

2014

JGR Atmospheres

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The characteristics of the diurnal, semidiurnal, and terdiurnal tides (zonal wave numbers À5 to +5 in temperature and zonal wind) in the polar mesosphere and lower thermosphere region as simulated by the extended Canadian Middle Atmosphere Model are examined. The most significant diurnal, semidiurnal, and terdiurnal tides in the polar regions are Ds0, Dw1, and De1; Sw3, Sw2, Sw1, Ss0, Se1, and Se2; and Tw3, Ts0, and Tw1, respectively, and their latitudinal structures, seasonal variations, and hemispheric asymmetries noted. Of these components, Ds0, Tw1, Ts0, and Tw3 exhibit a seasonally symmetric variation with both hemispheres strengthening simultaneously. On the other hand, Dw1 strengthens asymmetrically so that when one hemisphere is strong, the other is weak. The remainder show no seasonal tendency but vacillate on shorter than seasonal time scales in a symmetric or antisymmetric manner at different times of the year. Global-scale correlations of the amplitudes of the migrating tides Dw1/Sw2 and the stationary planetary wave 1 and the assumed "child" nonmigrating tides are also examined. The results indicate that the correlations are highly time scale-dependent and the significant correlations seen with the original time series are mainly due to longer-term variations (>18 days). There are no consistent global correlations associated with the short-term variations (<18 days) among these waves.

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Semidiurnal tides from the extended Canadian Middle Atmosphere Model (CMAM) and comparisons with TIMED Doppler interferometer (TIDI) and meteor radar observations

Cited by 36 publications

References 45 publications

The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

Reply to Comment on "Global structure, seasonal and interannual variability of the migrating semidiurnal tide seen in the SABER/TIMED temperatures (2002–2007)" by Manson et al. (2010)

The character of polar tidal signatures in the extended Canadian Middle Atmosphere Model

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Semidiurnal tides from the extended Canadian Middle Atmosphere Model (CMAM) and comparisons with TIMED Doppler interferometer (TIDI) and meteor radar observations

Cited by 36 publications

References 45 publications

The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

Reply to Comment on &quot;Global structure, seasonal and interannual variability of the migrating semidiurnal tide seen in the SABER/TIMED temperatures (2002–2007)&quot; by Manson et al. (2010)

The character of polar tidal signatures in the extended Canadian Middle Atmosphere Model

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Reply to Comment on "Global structure, seasonal and interannual variability of the migrating semidiurnal tide seen in the SABER/TIMED temperatures (2002–2007)" by Manson et al. (2010)