Simultaneous meteor radar observations at Monpazier (France, 44°N) and Punta Borinqnen (Puerto Rico, 18°N). III—The latitudinal variations of the energy of gravity waves (2–8 h) in the high mesosphere

Frezal, M. E.; Glass, M.; Fellous, Jean-Louis; Massebeuf, M.

doi:10.1016/0021-9169(81)90116-1

Cited by 12 publications

(2 citation statements)

References 4 publications

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“…Spectral analyses of gravity waves in terms of frequency and vertical wavenumber have been applied to radar observations at various locations [Carter and Balsley, 1982;Vincent, 1984;Frezal et al, 1981;Meek et al, 1985;Tsuda et al, 1989]. Among the various radar observations, the middle and upper atmosphere (MU) radar, an mesosphere-stratosphere-troposphere (MST) radar with quick beam steering, is a powerful instrument with which to observe the height profiles of the upward flux of horizontal momentum as well as gravity wave energy in the mesosphere.…”

Section: Introductionmentioning

confidence: 99%

Mesospheric gravity waves at Saskatoon (52°N), Kyoto (35°N), and Adelaide (35°S)

Nakamura¹,

Tsuda²,

Fukao³

et al. 1996

J. Geophys. Res.

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The gravity waves with periods of 10 min to 8 hours in the mesosphere (67–80 km) are studied using observations from the Adelaide MF radar (35°S), Saskatoon MF radar (52°N), and the middle and upper atmosphere (MU) radar at Shigaraki, near Kyoto (35°N). The seasonal variations of the gravity wave intensity deduced from the horizontal wind velocities showed semiannual variations with solstitial maxima and equinoctial minima at all three locations, but the month of maximum intensity in the year depends on the locations and wave frequency. The kinetic energy due to gravity waves showed similar amplitude between Kyoto and Adelaide, but smaller at Saskatoon, which agrees well with the results of the preliminary comparison using a limited frequency range and limited observation periods by Nakamura et al. [1993a, b]. The horizontal propagation direction of these gravity waves showed small seasonal variations and significant dependency with wave periods at Saskatoon but showed more frequent variation without a large frequency dependency at Kyoto and Adelaide. These characteristics indicate that at the lower latitudes gravity wave activity is larger, as pointed out by Tsuda et al. [1994] from various observational techniques. Also, the frequent changes of the gravity wave intensities at the lower latitudes suggest that there are strong influences of the background wind variation in the middle atmosphere such as semiannual oscillation, mesospheric semiannual oscillation and other wind variations in the low latitudes.

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Section: Introductionmentioning

confidence: 99%

Mesospheric gravity waves at Saskatoon (52°N), Kyoto (35°N), and Adelaide (35°S)

Nakamura¹,

Tsuda²,

Fukao³

et al. 1996

J. Geophys. Res.

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“…Spectral analysis of gravity waves in terms of frequency and vertical wavenumber has been applied to radar observations at various locations [Carter and Balsley, 1982;Vincent, 1984;Frezal et al, 1981;Tsuda et al, 1989].…”

Section: Introductionmentioning

confidence: 99%

Comparative observations of short‐period gravity waves (10–100 min) in the mesosphere in 1989 by Saskatoon MF radar (52°N), Canada and the MU radar (35°N), Japan

Nakamura¹,

Tsuda²,

Fukao³

et al. 1993

Radio Science

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We analyzed the wind variances of gravity waves during 10–100‐min periods observed in the mesosphere at 67–80 km altitude with the MU radar at Kyoto (35°N, 136°E) and the MF radar at Saskatoon (52°N, 107°W) in 1989. In order to compare the results quantitatively we applied similar data analysis procedures to the data sets which were obtained with different observation techniques. We first calculated frequency spectra of wind velocity, then estimated variances, , , and by integrating the spectra. The frequency spectra of the horizontal wind u′ and υ′ generally showed a spectral slope of about −5/3 at both locations. The spectral slope of w′ at Saskatoon ranged from −2/3 to −1 in winter, and −1/3 to −1/2 in other seasons, while it became nearly zero in May and September at both locations. The slope for the MU radar observations was less steep and sometimes became +0.15–0.3 in the frequency region lower than 50–70 day−1 (periods more than 20–30 min). The variance, , , and , showed semiannual variation with a large maximum in summer, a secondary peak in winter, and minima in September and April. The annual average of the ratios of , , and between the MU and Saskatoon MF radars was 1.6, 1.5, and 1.6. This result is interpreted as suggesting that the variance of gravity waves with periods of 10–100 min at 35°N is stronger than that at 52°N, even if the possible biases are taken into account. The variances due to gravity waves are more conspicuously enhanced in summer at Kyoto than at Saskatoon.

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MF/HF radar measurements of the dynamics of the mesopause region—A review

Vincent

1984

Journal of Atmospheric and Terrestrial Physics

100

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Simultaneous meteor radar observations at Monpazier (France, 44°N) and Punta Borinqnen (Puerto Rico, 18°N). III—The latitudinal variations of the energy of gravity waves (2–8 h) in the high mesosphere

Cited by 12 publications

References 4 publications

Mesospheric gravity waves at Saskatoon (52°N), Kyoto (35°N), and Adelaide (35°S)

Mesospheric gravity waves at Saskatoon (52°N), Kyoto (35°N), and Adelaide (35°S)

Comparative observations of short‐period gravity waves (10–100 min) in the mesosphere in 1989 by Saskatoon MF radar (52°N), Canada and the MU radar (35°N), Japan

MF/HF radar measurements of the dynamics of the mesopause region—A review

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