Global-scale tidal variability during the PSMOS campaign of June–August 1999: interaction with planetary waves

Pancheva, D.; Merzlyakov, E. G.; Mitchell, N. J.; Portnyagin, Yu. I.; Manson, A. H.; Jacobi, Ch.; Meek, C. E.; Luo, Yi; Clark, Ronald; Hocking, W. K.; MacDougall, J. W.; Müller, Heinz; Kürschner, D.; Jones, G. O. L.; Vincent, R. A.; Reid, Iain M.; Singer, W.; Igarashi, K.; Fraser, G. J.; Fahrutdinova, A.; Степанов, А. М.; Poole, L. M. G.; Malinga, Sandile B.; Kashcheyev, B. L.; Oleynikov, A.N.

doi:10.1016/s1364-6826(02)00199-2

Cited by 77 publications

(37 citation statements)

References 60 publications

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“…We will return to discussion of these two waves later, when we will consider the results of numerical simulations. It should be noted that in general, when there are substantial variations of amplitude depending on longitude, a linear fitting of longitudinal changes of the phase [ Pancheva et al , 2002] is not justified. The requirement for latitude‐independent amplitude is very rigorous, and account of longitudinal changes of amplitude can influence significantly the estimations of zonal wave numbers, especially in the case of relatively small secondary waves.…”

Section: Analysis Of Mlt Radar Datamentioning

confidence: 99%

Global free oscillations of the atmosphere and secondary planetary waves in the mesosphere and lower thermosphere region during August/September time conditions

et al. 2002

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[1] Wind measurements made using ground-based mesosphere and lower thermosphere radar systems at Sheffield, UK (2°W, 53°N) and Saskatoon, Canada (107°W, 52°N) show an increase in long-period planetary wave (PW) activity at the end of August until the middle of September 1993. Some of these waves can be identified with the well-known normal atmospheric modes; however, the westward propagating wave with zonal wave number one (m = 1) and a period of about 6.5 days observed during this time interval cannot be explained using the classical theory of free atmospheric oscillations. Analysis of the UKMO assimilated fields shows that in the stratosphere the 7-day wave with m = 2 increases in amplitude during the time interval considered, and there exists a strong stationary planetary wave (SPW) with m = 1. A steady state two-dimensional numerical model of planetary waves has been used to simulate the free atmospheric oscillations and secondary planetary wave, which arises from a nonlinear interaction between the second asymmetric normal mode with m = 2 (the 7-day wave) and SPW with m = 1. The results of simulation show that an increase in long-period PW activity during August/ September can be explained by seasonal changes of the zonal mean flow, which influence the wave propagation conditions, and that one of the possible sources for the 6.5-day wave is a nonlinear interaction between the 7-day wave and SPW with m = 1. It is suggested that the 6.5-day wave with m = 1 be referred to as a ''secondary normal mode,'' which has been generated by random meteorological motions in the lower atmosphere and involving interaction with a SPW of wave number 1.

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Section: Analysis Of Mlt Radar Datamentioning

confidence: 99%

Global free oscillations of the atmosphere and secondary planetary waves in the mesosphere and lower thermosphere region during August/September time conditions

et al. 2002

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“…Atmospheric tides are among the most prominent motions in the mesosphere and lower thermosphere (MLT), often dominating the meridional wind field at low latitudes [ Hays et al , 1994]. Diurnal amplitudes in the MLT exhibit variations on timescales ranging from days to years [ Fritts and Isler , 1994; Burrage et al , 1995; Eckermann et al , 1997; Nakamura et al , 1997; Fritts et al , 1997; Pancheva et al , 2002]. The possible causes have not been fully sorted out, but are generally thought to fall into two categories: (1) variability of tropospheric or stratospheric tidal forcing and (2) amplitude modulation due to interaction with the mean flow [ Forbes and Vincent , 1989; Hagan et al , 1999; McLandress , 2002b], planetary waves [ Manson et al , 1982; Teitelbaum and Vial , 1991; Palo et al , 1998; Palo et al , 1999; Pancheva et al , 2002; Lieberman et al , 2004] and gravity waves [ Walterscheid , 1981; Fritts and Vincent , 1987; McLandress and Ward , 1994; Nakamura et al , 1997; Meyer , 1999; McLandress , 2002a].…”

Section: Introductionmentioning

confidence: 99%

Variability of mesospheric diurnal tides and tropospheric diurnal heating during 1997–1998

et al. 2007

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[1] This study focuses on interannual variations of diurnal tropospheric heating and the response in the mesosphere observed by radars and predicted by a model. The work is prompted by reports of interannual variability in amplitudes of tidal variables at low latitudes. Diurnal tides observed at Hawaii and Christmas Island exhibit a pronounced ''spike'' in amplitude from late 1997 to early 1998. It has been speculated that this variability may be linked to the El Niño-Southern Oscillation phenomenon. We examine diurnal solar heating due to water vapor absorption, and diurnal latent heat release due to deep convection between 1988 and 2005. Both of these heating drives exhibit anomalously higher amplitudes in the tropical central and eastern Pacific during 1997-1998. The altered heating patterns result in a stronger forcing of the migrating diurnal tide by water vapor heating, and excitation of several weaker nonmigrating modes by latent heating. A primitive equation model is used to evaluate how these drives contribute to diurnal winds in the mesosphere. Anomalous water vapor heating results in about 15% increases in model meridional wind amplitudes over climatological values at subtropical latitudes between 300°E and the Greenwich meridian. While the timing of the model amplitude enhancements is consistent with observations at Hawaii, the observed increases are significantly stronger. Our study indicates that water vapor heating is the larger contributor to tidal enhancement observed during 1997-1998.

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“…As an alternative means of generating nonmigrating tides, Walterscheid et al (1986) suggested that GW interactions with migrating tides could be important. Teitelbaum and Vial (1991) proposed nonlinear interactions between migrating tides and PWs; and the observed strong correlations between migrating diurnal and semidiurnal amplitudes and PW activity indicates that this is an important mechanism (e.g., Pancheva et al, 2002;Forbes et al, 1995;Talaat and Lieberman, 1999). Coll and Forbes (2002) demonstrated that nonlinear interactions between the solar driven migrating semidiurnal tide and quasi-stationary m ¼ 1 PWs could explain the westward propagating 12-h wave observed in radar measurements near the South Pole .…”

Section: Introductionmentioning

confidence: 99%

“…Temperature measurements with the Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere (CRISTA) experiment on the Space Shuttle produced significant non-migrating diurnal tides at altitudes between 40 and 90 km (Oberheide et al, 2002). Longitudinal variations more complex than that of m ¼ 2 in the migrating semidiurnal tide have been observed in both satellite and ground-based data (e.g., Forbes 1995;Jacobi et al, 1999;Pancheva et al, 2002;Manson et al, 2002). With an empirical model for the HRDI wind measurements on UARS, Huang and Reber (2004) described the seasonal variations of the non-migrating diurnal and semidiurnal tides observed in the upper mesosphere.…”

Section: Introductionmentioning

confidence: 99%

Mesospheric non-migrating tides generated with planetary waves: I. Characteristics

Mayr¹,

Mengel²,

Talaat³

et al. 2005

Journal of Atmospheric and Solar-Terrestrial Physics

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Global-scale tidal variability during the PSMOS campaign of June–August 1999: interaction with planetary waves

Cited by 77 publications

References 60 publications

Global free oscillations of the atmosphere and secondary planetary waves in the mesosphere and lower thermosphere region during August/September time conditions

Global free oscillations of the atmosphere and secondary planetary waves in the mesosphere and lower thermosphere region during August/September time conditions

Variability of mesospheric diurnal tides and tropospheric diurnal heating during 1997–1998

Mesospheric non-migrating tides generated with planetary waves: I. Characteristics

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