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Namboothiri, S. P.; Kishore, P.; Igarashi, K. (2002)
Publisher: European Geosciences Union
Languages: English
Types: Article
Subjects: Geophysics. Cosmic physics, Q, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, Science, Physics, QC1-999, QC801-809
The 16-day wave climatology at Yamagawa (31.2° N, 130.6° E) is investigated by analyzing the mesosphere and lower thermosphere (MLT) wind data collected with the recently installed MF radar. We have utilized the continuous data gathered during the five-year period 1996–2000. The wave climatology clearly shows some seasonal variations. The period of late autumn-spring is marked with larger wave activity, with the strongest waves being observed in the winter months. The maximum amplitude observed at Yamagawa is about 20 m/s, which is comparatively larger than the amplitudes observed at mid-latitude stations. The height dependence of the 16-day wave suggests that the maximum amplitude is observed at altitudes below 80 km. The summer months are characterized with much weaker wave activity. The vertical wavelength appears to be larger in the winter months and shorter in the summer months. The present analysis again confirms that the 16-day wave is highly sensitive to the background mean winds. Eastward motion of the background winds is a more favourable condition for the 16-day wave penetration to the MLT heights. The wave features show some signs of interannual variability. Overall, the observed features of the 16-day wave at Yamagawa, which is located at the edge of the subtropical latitudes, show some correspondence with the results reported for mid-latitude stations.<br><br><b>Key words. </b>Meteorology and atmospheric dynamics (climatology; thermospheric dynamics)
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    • Briggs, B. H.: The analysis of spaced sensor records by correlation technique, MAP Handb., 13, 166-184, 1984.
    • Espy, P. J., Stegman, J., and Witt, G.: Interannual variations of the quasi-16-day oscillation in the polar summer mesospheric temperature, J. Geophys. Res., 102, 1983-1990, 1997.
    • Forbes, J. M., Hagan, M. E., Miyahara, S., Vial, F., Manson, A. H., Meek, C. E., and Portnyagin, Y. I.: Quasi 16-day oscillation in the mesosphere and lower thermosphere, J. Geophys. Res., 100, 9149-9163, 1995.
    • Hagan, M. E., Forbes, J. M., and Vial, F.: Numerical investigation of the propagation of the quasi-two-day wave into the lower thermosphere, J. Geophys. Res., 98, 23 193-23 205, 1993.
    • Holton, J. R.: The generation of mesospheric planetary waves by zonally asymmetric gravity wave breaking, J. Atmos. Sci., 41, 3427-3430, 1984.
    • Igarashi, K., Nishimuta, Y., Murayama, Y., Tsuda, T., Nakamura, T., and Tsutsumi, M.: Comparison of wind measurements between the Yamagawa MF radar and the MU radar, Geophys. Res. Lett., 23, 3341-3344, 1996.
    • Jacobi, C., Schminder, R., and Kuerschner, D.: Planetary wave activity obtained from long-period (2-18 days) variations of mesopause region winds over Central Europe (52◦ N, 15◦ E), J. Atmos. Solar-Terr. Phys., 60, 81-93, 1998.
    • Kingsley, S. P., Muller, H. G., Nelson, L., and Scholefield, A.: Meteor winds over Sheffield, J. Atmos. Terr. Phys., 40, 917-922, 1978.
    • Kishore, P., Namboothiri, S. P., and Igarashi, K.: Study of mesosphere lower thermosphere (MLT) mean winds over Yamagawa (31.2◦ N, 130.6◦ E) during 1996-1998, J. Geophys. Res., 105, 24 863-24 870, 2000.
    • Luo, Y., Manson, A. H., Meek, C. E., Meyer, C. K., and Forbes, J. M.: The quasi 16-day oscillations in the mesosphere and lower thermosphere at Saskatoon (52◦ N, 107◦ W), J. Geophys. Res., 105, 2125-2138, 2000.
    • Luo, Y., Manson, A., Meek, C., Thayaparan, T., MacDougall, J., and Hocking, W.: The 16-day wave in the mesosphere and lower thermosphere: simultaneous observations at Saskatoon (52◦ N, 107◦ W) and London (43◦ N, 81◦ W), Canada, J. Atmos. SolarTerr. Phys. (in press), 2002.
    • Manson, A. H. and Meek, C. E.: Dynamics of the middle atmosphere at Saskatoon (52 N, 107 W): A spectral study during 1981, 1982, J. Atmos. Terr. Phys., 48, 1039-1055, 1986.
    • Manson, A. H., Gregory, J. B., and Meek, C. E.: Atmospheric waves (10 min-30 days) in the mesosphere and lower thermosphere at Saskatoon (52◦ N, 107◦ W) October 1978-September 1979, Planet. Space Sci., 29, 615-625, 1981.
    • Meek, C. E., Manson, A. H., Franke, S. J., Singer, W., Hoffmann, P., Clark, R. R., Tsuda, T., Nakamura, T., Tsutsumi, M., Hagan, M., Fritts, D. C., Isler, J., Portnyagin, Y. I.: Global study of northern hemisphere quasi-2-day wave events in recent summers near 90 km altitude, J. Atmos. Solar-Terr. Phys., 58, 1401-1411, 1996.
    • Mitchell, N. J., Middleton, H. R., Beard, A. G., Williams, P. J. S., and Muller, H. G.: The 16-day planetary wave in the mesosphere and lower thermosphere, Ann. Geophysicae, 17, 1447- 1456, 1999.
    • Miyahara, S., Portnyagin, Y. I., Forbes, J. M., and Solovjeva, T. V.: Mean zonal acceleration and heating of the 70- to 100-km region, J. Geophys. Res., 96, 1225-1238, 1991.
    • Miyoshi, Y.: Numerical simulation of the 5-day and 16-day waves in the mesopause region, Earth Planets Space, 51, 763-772, 1999.
    • Namboothiri, S. P., Kishore, P., Igarashi, K., Nakamura, T., and Tsuda, T.: MF radar observations of mean winds over Yamagawa (31.2◦ N, 130.6◦ E) and Wakkanai (45.4◦ N, 141.7◦ E), J. Atmos. Solar-Terr. Phys., 62, 1177-1187, 2000.
    • Namboothiri, S. P., Kishore, P., and Igarashi, K.: Observations of the quasi-two-day wave in the mesosphere and lower thermosphere over Yamagawa and Wakkanai, J. Geophys. Res. (in press), 2002.
    • Press, W. H., Teukolsky, S. A., Vetterling, W. T., and Flannery, B. P.: Numerical Recipes in C, Cambridge Univ. Press, New York, 1992.
    • Rodgers, C. D. and Prata, A.: Evidence for a traveling 2-day wave in the middle atmosphere, J. Geophys. Res., 86, 9661-9664, 1981.
    • Rosenlof, K. H. and Thomas, R. J.: Five-day mesospheric waves observed in Solar Mesosphere Explorer ozone, J. Geophys. Res., 95, 895-900, 1990.
    • Salby, M. L.: Rossby normal modes in nonuniform background configurations, Part I, Simple fields, J. Atmos. Sci., 38, 1803- 1826, 1981a.
    • Salby, M. L.: Rossby normal modes in nonunoform background configurations, Part II, Equinox and solstice conditions, J. Atmos. Sci., 38, 1827-1840, 1981b.
    • Scargle, J. D.: Studies in astronomical time series analysis. II, Statistical aspects of spectral analysis of unevenly spaced data, Astrophys. J., 263, 835-853, 1982.
    • Thayaparan, T., Hocking, W. K., MacDougall, J. W.: Amplitude, phase, and period variations of the quasi-2-day wave in the mesosphere and lower thermosphere over London, Canada (43◦ N, 83◦ W) during 1993 and 1994, J. Geophys. Res., 102, 9461- 9478, 1997.
    • Vincent, R. A.: Planetary and gravity waves in the mesosphere and lower thermosphere, Adv. Space Res., 10, 93-101, 1990.
    • Williams, C. R. and Avery, S. K.: Analysis of long-period waves using the mesosphere-stratosphere-troposphere radar at Poker Flat, Alaska, J. Geophys. Res., 97, 20 855-20 861, 1992.
    • Wu, D.H. and Miyahara, S.: On the structure and behavior of transient waves during January 1979, J. Meteorol. Soc. Jpn., 66, 247- 260, 1988.
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