Global structure and seasonal variations of the migrating 6-h tide observed by SABER/TIMED

Liu, Mohan; Xu, Jiyao; Yue, Jia; Jiang, Guoying

doi:10.1007/s11430-014-5046-6

Cited by 26 publications

(49 citation statements)

References 35 publications

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“…However, 6 h tidal signatures were observed in lower ionospheric Es parameters already (Tong et al, 1988;Morton et al, 1993). For the neutral atmosphere, observations of the QDT in barographic records (e.g., Warburton and Goodkind, 1977;Hupe et al, 2018) have been reported, and some reports on observations from mesosphere and lower thermosphere (MLT) radars are available (Smith et al, 2004;Liu et al, 2006;Jacobi et al, 2017;Jacobi et al, 2018;Guharay et al, 2018). Few attempts to numerically model the QDT were undertaken (Smith et al, 2004;Jacobi et al, 2018).…”

Section: Jacobi Et Al: Quarterdiurnal Signature In Sporadic Ementioning

confidence: 99%

Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear

et al. 2019

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Abstract. The GPS radio occultation (RO) technique is used to study sporadic E (Es) layer plasma irregularities of the Earth's ionosphere on a global scale using GPS signal-to-noise ratio (SNR) profiles from the COSMIC/FORMOSAT-3 satellite. The maximum deviation from the mean SNR can be attributed to the height of the Es layer. Es are generally accepted to be produced by ion convergence due to vertical wind shear in the presence of a horizontal component of the Earth's magnetic field, while the wind shear is provided mainly by the solar tides. Here we present analyses of quarterdiurnal tide (QDT) signatures in Es occurrence rates. From a local comparison with mesosphere/lower thermosphere wind shear obtained with a meteor radar at Collm (51.3∘ N, 13.0∘ E), we find that the phases of the QDT in Es agree well with those of negative vertical shear of the zonal wind for all seasons except for summer, when the QDT amplitudes are small. We also compare the global QDT Es signal with numerical model results. The global distribution of the Es occurrence rates qualitatively agrees with the modeled zonal wind shears. The results indicate that zonal wind shear is indeed an important driving mechanism for the QDT seen in Es.

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Section: Jacobi Et Al: Quarterdiurnal Signature In Sporadic Ementioning

confidence: 99%

Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear

et al. 2019

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“…Simulations of gravity wave-tide interactions were performed by Ribstein and Achatz (2016), but they did not analyze higher harmonics than the SDT. Liu et al (2006) showed nonlinear interactions between atmospheric tides at midlatitude radar measurements, as well as an interaction between tides and gravity waves from a bicoherence spectrum analysis. This was mainly found for the upper height gates considered.…”

Section: Introductionmentioning

confidence: 95%

Forcing mechanisms of the migrating quarterdiurnal tide

2020

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Abstract. We used a nonlinear mechanistic global circulation model to analyze the migrating quarterdiurnal tide (QDT) in the middle atmosphere with focus on its possible forcing mechanisms: the absorption of solar radiation by ozone and water vapor, nonlinear tidal interactions, and gravity wave–tide interactions. We show a climatology of the QDT amplitudes, and we examine the contribution of the different forcing mechanisms to the QDT amplitude. To this end, we first extracted the QDT from the model tendency terms and then removed the respective QDT contribution from the different tendency terms. We find that the solar forcing mechanism is the most important one for the QDT; however, the nonlinear and gravity wave forcing mechanisms also play a role in autumn and winter, particularly at lower and middle latitudes in the mesosphere and lower thermosphere. Furthermore, destructive interference between the individual forcing mechanisms is observed. Therefore, tidal amplitudes become even larger in simulations with the nonlinear or gravity wave forcing mechanisms removed.

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“…In the northern hemisphere, largest amplitudes are found in February and October. Liu et al (2015) showed a climatology of QDT temperature amplitudes from SABER/TIMED satellite data between 50 • North and South over 10 years. The amplitudes presented by Liu et al (2015) show maxima near 30 • North and South and above the equator.…”

Section: Reference Simulation and Qdt Climatologymentioning

confidence: 99%

“…Liu et al (2015) showed a climatology of QDT temperature amplitudes from SABER/TIMED satellite data between 50 • North and South over 10 years. The amplitudes presented by Liu et al (2015) show maxima near 30 • North and South and above the equator. Their QDT temperature amplitudes reach values of 0.5 K to 1.0 K between 70 km and 90 km, and at higher altitudes the amplitudes reach up to 4 K on an annual and long-term average.…”

Section: Reference Simulation and Qdt Climatologymentioning

confidence: 99%

“…We used a horizontal resolution of 2.5 • × 5.625 • for the model, which differs from the version of e.g., Lilienthal et al (2017Lilienthal et al ( , 2018, to be able to better resolve the meridional structure of the QDT. In an earlier model version with 5 • meridional resolution, essentially only one maximum in the QDT amplitudes per hemisphere was seen (Jacobi et al, 2019), while satellite observations (Azeem et al, 2016;Liu et al, 2015) show a more detailed meridional structure. Also from the linear theory including the QDT meridional structure representation by Hough modes, another result was expected, as shown by Azeem et al (2016).…”

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confidence: 90%

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Forcing mechanisms of the quarterdiurnal tide

Geißler

Jacobi

Lilienthal

2019

Preprint

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Abstract. We used a nonlinear mechanistic global circulation model to analyze the migrating quarterdiurnal tide (QDT) in the middle atmosphere with focus on its possible forcing mechanisms. These are absorption of solar radiation by ozone and water vapor, nonlinear tidal interactions, and gravity wave-tide interactions. We show a climatology of the QDT amplitudes, and we examined the contribution of the different forcing mechanisms on the QDT amplitude. To this end, we first extracted the QDT in the model tendency terms. Then, we separately removed the QDT contribution in different tendency terms. We find that the solar forcing mechanism is the most important one for the QDT, but also the nonlinear and gravity wave forcing mechanism play a role in certain seasons, latitudes and altitudes. Furthermore, destructive interference between the individual forcing mechanisms are observed. Therefore, tidal amplitudes partly become even larger in simulations with removed nonlinear or gravity wave forcing mechanism.

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Global structure and seasonal variations of the migrating 6-h tide observed by SABER/TIMED

Cited by 26 publications

References 35 publications

Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear

Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear

Forcing mechanisms of the migrating quarterdiurnal tide

Forcing mechanisms of the quarterdiurnal tide

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