Correlations of gravity waves and tides in the mesosphere over Saskatoon

Manson, A. H.; Meek, C. E.; Hall, Greg

doi:10.1016/s1364-6826(98)00059-5

Cited by 37 publications

(48 citation statements)

References 23 publications

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“…More generally, the monthly occurrences of the Q2DW at m=+3, which include winter as well as summer months, are very consistent with the radar-wind studies of this wave (Meek et al, 1996;Chshyolkova et al, 2005). We also note that although the non-linear interaction between the Q2DW and the diurnal tide has been documented for particular events (Manson et al, 1998;Pancheva, 2006), instances of the production of 16 h oscillations are not numerous enough to lead to a spectral peak in Fig. 6.…”

Section: Summer Frequency "Dish"supporting

confidence: 85%

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Meek

Manson

2009

Ann. Geophys.

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Abstract. The advent of satellite based sampling brings with it the opportunity to examine virtually any part of the globe. Aura MLS mesospheric temperature data are analysed in a wavelet format for easy identification of possible planetary waves (PW) and aliases masquerading as PW. A calendar year, 2005, of eastward, stationary, and westward waves at a selected latitude is shown in separate panels for wave number range −3 to +3 for period range 8 h to 30 days (d). Such a wavelet analysis is made possible by Aura's continuous sampling at all latitudes 82 • S-82 • N. The data presentation is suitable for examination of years of data. However this paper focuses on the striking feature of a "dish-shaped" upper limit to periods near 2 d in mid-summer, with longer periods appearing towards spring and fall, a feature also commonly seen in radar winds. The most probable cause is suggested to be filtering by the summer jet at 70-80 km, the latter being available from ground based medium frequency radar (MFR). Classically, the phase velocity of a wave must be greater than that of the jet in order to propagate through it. As an attempt to directly relate satellite and ground based sampling, a PW event of period 8d and wave number 2, which appears to be the original rather than an alias, is compared with ground based radar wind data. An appendix discusses characteristics of satellite data aliases with regard to their periods and amplitudes.

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Section: Summer Frequency "Dish"supporting

confidence: 85%

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Meek

Manson

2009

Ann. Geophys.

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“…This irregular behavior could be attributed to the variabilities associated with the wave sources at lower heights, which can complicate the simple scenario discussed above. The variabilities of lower level mean zonal wind will add to this complexity in the interpretation of gravity wave-tide interactions at higher levels [Manson et al, 1998]. …”

Section: Observations and Data Analysismentioning

confidence: 99%

Mean winds, tides, and gravity waves during the westward phase of the mesopause semiannual oscillation (MSAO)

Gurubaran¹,

Rajaram²

2001

J. Geophys. Res.

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Abstract. MF radar observations of mean winds, tides, and gravity waves (in the period range 30-120 min) over Tirunelveli (8.7øN, 77.8øE) during April 1993, when the mesopause semiannual oscillation (MSAO) was in the westward phase, are presented in this work. The focus herein is on the observed relationship between these dynamical parameters, which is explained in the context of the current understanding of the behavior of MSAO winds, tidal dissipation, and gravity wave-tide interactions. The observed diurnal tide amplitude and phase variations with height indicate (1,1) wave damping and subsequent westward momentum deposition. The gravity wave variances are shown to be modulated by the diurnal tide. Though the analysis does not lead to an estimation of gravity wave contributions to the time-mean zonal flow and its shears, the observations do suggest that the short-term tidal variability contributes, either directly, or indirectly through the gravity wave-tidal interactions, to the variation of the strength of the time-mean westward flow associated with the MSAO.

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“…The waves are known to interact with and modulate the amplitudes of atmospheric tides (e.g., Teitelbaum and Vial, 1991;Beard et al, 1997). They also modulate the gravity-wave field of the middle atmosphere (e.g., Forbes et al, 1991;Miyahara and Forbes, 1991a;Thayaparan et al, 1995;Nakamura et al, 1997;Manson et al, 1998Manson et al, , 2003. Planetary waves with a period of 16 days have been reported in observations of wind, temperature and geopotential height in the MLT region (e.g., Forbes et al, 1995;Espy and Witt, 1996;Espy et al, 1997;Mitchell et al, 1999;Luo et al, 2000Luo et al, , 2002aManson et al, 2003;Jiang et al, 2005;Lima et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere

Day

Mitchell

2010

Atmos. Chem. Phys.

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Abstract. The 16-day planetary wave in the polar mesosphere and lower thermosphere has been investigated using meteor radars at Esrange (68 • N, 21 • E) in the Arctic and Rothera (68 • S, 68 • W) in the Antarctic. The measurements span the 10-year interval from October 1999 to July 2009 and the 5-year interval February 2005 to July 2009, respectively. The height range covered is about 80-100 km. In both polar regions the wave is seen to occur in intermittent bursts, where wave amplitudes typically reach a maximum of about 15 m s −1 , and never more than about 20 m s −1 . Horizontal wind variance within a wave-period range of 12 to 20 days is used as a proxy for the activity of the 16-day wave. Wave activity is strong for 3 to 4 months in winter, where it is present across the entire height range observed and monthly wave variance reaches about 65 m 2 s −2 . Some weak and intermittent activity is observed throughout the other seasons including summer. However, there is a high degree of inter-annual variability and in some individual years wave activity is almost absent. The data are used to construct a representative climatology for the Arctic and Antarctic. The seasonal cycle of the 16-day wave is found to be very similar in both polar regions. The 16-day wave has slightly greater amplitudes in the zonal component of the winds than in the meridional. Mesospheric temperatures measured by the radars were used to further investigate the 16-day wave. The temperatures reveal a clear signature of the 16-day wave. Temperature amplitudes are generally only a few Kelvin but occasional bursts of up to 10 K have been observed. Observations of the wave in summer are sometimes consistent with the suggestion of ducting from the winter hemisphere.

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Correlations of gravity waves and tides in the mesosphere over Saskatoon

Cited by 37 publications

References 23 publications

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Summer planetary-scale oscillations: aura MLS temperature compared with ground-based radar wind

Mean winds, tides, and gravity waves during the westward phase of the mesopause semiannual oscillation (MSAO)

The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere

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