A numerical study on the impact of nonlinear interactions on the amplitude of the migrating semidiurnal tide

Huang, Chunming; Zhang, S. D.; Yi, Fan

doi:10.5194/angeo-24-3241-2006

Cited by 9 publications

(7 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The former can be seen in a wider latitude range of 7.5°N–32.5°N, whereas the latter only appears at latitudes 0–12.5°N. Many numerical and observational studies (Huang et al ., ; ; ; ; ; ; ; ) suggested that an atmospheric wave with frequency f 3 could be excited by two prescribed waves (with different frequencies f 1 and f 2 , respectively) through interaction when their frequencies satisfy the matching conditions f 1 ± f 2 = f 3 . Barnett () and Mayr et al .…”

Section: Vertical Wave‐number Spectramentioning

confidence: 99%

The vertical wave number spectra of potential energy density in the stratosphere deduced from the COSMIC satellite observation

Yan

Zhang

Huang

et al. 2018

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

The statistical analysis shows that the spectral amplitude (defined as the maximum spectral energy density) varies from 0.1 × 10 4 m 2 s −2 (cycle/m) −1 to 3.2 × 10 4 m 2 s −2 (cycle/m) −1 , generally smaller than the theoretical saturated spectral amplitude, with remarkable temporal and spatial variations. Due to the latitudinal and seasonal variations of the background winds and wave sources, the amplitude exhibits obvious quasi-biennial, annual and semi-annual cycles at low latitudes, and the annual cycle at middle and high latitudes.The spectral slope, ranging from −1.6 to −3.0, is systematically less negative than the canonical value of −3, and exhibits a quasi-biennial cycle at low latitudes, annual cycle at middle and high latitudes, and semi-annual cycle at boreal high latitudes. Different from the amplitude, the slope shows weaker temporal and latitudinal variations, strongly indicating a more universal feature of the slope, which mainly results from the wave propagation process (such as the wave-wave or wave-background flow interactions) rather than the wave source characteristics. Furthermore, we statistically study the longitudinal variation of the spectral parameters. The spectral amplitude at different latitudes shows an obvious and distinctive longitudinal distribution, which is attributed to the latitude-dependent jet and front mechanisms and/or orography. However, the slope has no evident longitudinal distribution except over around 120 • W, 67 • W and 85 • E. This may be accounted for by the fact that orography-excited gravity waves are easily influenced by the background winds due to their low frequencies. Interestingly, the amplitude and slope have negative correlation at most latitudes. Larger spectral amplitudes could mean that the gravity wave spectrum is more strongly saturated, resulting in a spectral slope closer to the theoretical value of −3. KEYWORDS

show abstract

Section: Vertical Wave‐number Spectramentioning

confidence: 99%

The vertical wave number spectra of potential energy density in the stratosphere deduced from the COSMIC satellite observation

Yan

Zhang

Huang

et al. 2018

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

show abstract

“…A detailed description of the computational method was presented by Huang et al (2006Huang et al ( , 2007. Considering the spatial scales of the initial GW, x and z are set to 10 and 0.4 km, respectively.…”

Section: Methodsmentioning

confidence: 99%

Frequency variations of gravity waves interacting with a time-varying tide

et al. 2013

Self Cite

View full text Add to dashboard Cite

Abstract. Using a nonlinear, 2-D time-dependent numerical model, we simulate the propagation of gravity waves (GWs) in a time-varying tide. Our simulations show that when a GW packet propagates in a time-varying tidal-wind environment, not only its intrinsic frequency but also its ground-based frequency would change significantly. The tidal horizontalwind acceleration dominates the GW frequency variation. Positive (negative) accelerations induce frequency increases (decreases) with time. More interestingly, tidal-wind acceleration near the critical layers always causes the GW frequency to increase, which may partially explain the observations that high-frequency GW components are more dominant in the middle and upper atmosphere than in the lower atmosphere. The combination of the increased ground-based frequency of propagating GWs in a time-varying tidal-wind field and the transient nature of the critical layer induced by a time-varying tidal zonal wind creates favorable conditions for GWs to penetrate their originally expected critical layers. Consequently, GWs have an impact on the background atmosphere at much higher altitudes than expected, which indicates that the dynamical effects of tidal-GW interactions are more complicated than usually taken into account by GW parameterizations in global models.

show abstract

“…Gravity waves (GWs) play an important role in atmospheric dynamics and strongly influences the local and global atmospheric dynamical processes and atmospheric structures (Alexander, ; Alexander & Pfister, ; Fritts & Alexander, ; Fritts & Rastogi, ; Lindzen, ). Meanwhile, the GWs propagation will also be affected by the background atmosphere they propagate through (e.g., Heale & Snively, ; Huang et al, , , , ; Zhang & Yi, , ). Previous studies (e.g., Fritts & Yuan, ; Hecht et al, ; Vadas, ; Walterscheid et al, ; Walterscheid & Hickey, ) suggested that if the atmospheric temperature or wind satisfies the specific conditions, gravity wave (GW) ducting can occur.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Gravity Wave Propagation Characteristics in the Stratospheric Thermal Duct

et al. 2018

View full text Add to dashboard Cite

We developed a fully nonlinear, two-dimensional, numerical model to simulate the long horizontal distance propagations of atmospheric gravity waves in a stratospheric thermal duct. The numerical results show that after the wind disturbance excited by the initial wave forcing enters the duct completely, symmetric and antisymmetric modes can be identified in the horizontal direction. The frequency-wave number spectrum indicates that various modes with different spatial structures can exist simultaneously in the duct. The primary parameters (horizontal wavelength, vertical wavelength and wave frequency) of the ducted wave packets in a given thermal duct are mainly determined by the horizontal wavelength of the initial wave forcing. The mean ratio of the upward propagating energy to the downward propagating energy in the thermal duct was regarded as an approximation of the power standing wave ratio (PSWR). The time variation of PSWR indicates that the standing wave was formed with the propagation of the ducted waves. During the gravity waves ducted propagation, most wave energy is restricted to the ducting region and dissipates slowly with time. The higher the wave frequency (or the shorter the horizontal wavelength) of the initial wave forcing, the slower the wave energy dissipates.

show abstract

A numerical study on the impact of nonlinear interactions on the amplitude of the migrating semidiurnal tide

Cited by 9 publications

References 54 publications

The vertical wave number spectra of potential energy density in the stratosphere deduced from the COSMIC satellite observation

The vertical wave number spectra of potential energy density in the stratosphere deduced from the COSMIC satellite observation

Frequency variations of gravity waves interacting with a time-varying tide

A Numerical Study of Gravity Wave Propagation Characteristics in the Stratospheric Thermal Duct

Contact Info

Product

Resources

About