Summary
Using high altitude rocketsonde data for Thumba (8.5 N, 76.9E) and Balasore (21.5 N, 86.9E) and the stratalert messages for high latitudes for the winter (December–March) 1984–1985, an examination has been made to study the perturbations in the temperature and winds in the tropical middle atmosphere and their linkage with the dynamical events occurring over the high-latitude middle atmosphere during that winter.
The results of analysis indicated occurrence of strong cooling in the mesosphere over a period of seven days (5–12 December 1984) and the depth of the cooling layer was 15 km. This incident was followed by a strong warming over a period of seven days (12–19 December 1984) and the depth of the warming layer was 13 km. The major warming event, which occurred over high latitudes during the later part of December and the first week of January, was followed by the cooling in the mesosphere and warming in the stratosphere at Thumba. Also the zonal winds were strong easterly and the meridional winds were northerly in the upper stratosphere and the lower mesosphere over tropics during the same period. Weaker zonal winds/stronger easterly winds were generally noticed to be associated with coolings/warmings over tropics.
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References
Dunkerton, T., Hsu, C. P. F., McIntyre, M. E., 1981: Some Eulerian and Lagrangian diagnostics for a model stratospheric warming.J. Atmos. Sci.,38, 819–843.
Fritz, S., Soules, S. D., 1970: Large-scale temperature changes in the stratosphere observed from Nimbus III.J. Atmos. Sci.,27, 1091–1097.
Hamilton, K., 1982: Rocketsonde observations of the mesospheric semiannual oscillation at Kwajalein.Atmos. Ocean,20, 281–286.
Hirota, I., 1978: Equatiorial waves in the upper stratosphere and mesosphere in relation to the semiannual oscillation of the zonal wind.J. Atmos. Sci.,35, 714–722.
Hirota, I., 1980: Observational evidence of the semiannual oscillation in the tropical middle temperature—a review.Pure Appl. Geophys.,118, 217–238.
Holton, J. R., 1976: A semi-spectral numerical model for wave-mean flow interactions in the stratosphere: application to sudden stratospheric warmings.J. Atmos. Sci.,33, 1639–1649.
Hopkins, R. H., 1975: Evidence of polar-tropical coupling in upper stratospheric zonal wind anomalies.J. Atmos. Sci.,32, 712–719.
Labitzke, K., 1965: On the mutual relation between stratosphere and troposphere during periods of stratospheric warmings in winter.J. Appl. Meteor.,4, 91–99.
Labitzke, K., 1972: Temperature changes in the mesosphere and stratosphere connected with circulation changes in winter.J. Atmos. Sci.,29, 756–766.
Labitzke, K., 1977: Interannual variability of the winter stratosphere in the northern hemisphere.Mon. Wea. Rev.,105, 762–770.
Labitzke, K., Lenschow, R., Naujokat, B., Petzoldt, K., 1985: First note on the major stratospheric warming at the end of December 1984.Middle Atmosphere Programme Newsletter (March), 1–2.
Matsuno, T., 1971: A dynamical model of stratospheric sudden warming.J. Atmos. Sci.,28, 1479–1494.
McInturff, R. M., 1978:Stratospheric Warmings: Synoptic, Dynamic and General Circulation Aspects. Ed., NASA Reference Publication 1017, 166 pp.
Mukherjee, B. K., Ramana Murty, Bh. V., 1972: High-level warmings over a tropical station.Mon. Wea. Rev.,100, 674–681.
Mukherjee, B. K., Reddy, R. S., Ramana Murty, Bh. V., 1979: High-level warmings, winds and Indian summer monsoon.Mon. Wea. Rev.,107, 1581–1588.
Mukherjee, B. K., Reddy, R. S., Ramana Murty, Bh. V., 1981: High-level temperatures and winds over tropics and Indian summer monsoon.J. Geophys. Res.,86, 9688–9692.
Mukherjee, B. K., Indira, K., Reddy, R. S., Ramana Murty, Bh. V., 1985: Stratospheric/mesospheric warmings over tropics during winter and their implications for warming campaign of 1983–84.Indian J. Radio and Space Phys.,14, 34–37.
Quiroz, R. S., Miller, A. J., Nagatani, R. M., 1975: A comparison of observed and simulated properties of sudden stratospheric warming.J. Atmos. Sci.,32, 1723–1736.
Salby, M. L., 1984: Transient disturbances in the stratosphere: Implications for theory and observing systems.J. Atmos. Terr. Phys.,48, 1009–1047.
Schoeberl, M. R., 1978: Stratospheric warmings: observation and theory.Rev. Geophys. Space Phys.,16, 521–538.
Schoeberl, M. R., Strobel, D. F., 1980: Numerical simulation of sudden stratospheric warmings.J. Atmos. Sci.,37, 214–236.
Van Loon, H., Labitzke, K., Jenne, P. J., 1972: Half-yearly waves in the stratosphere.j. Geophys. Res.,77, 3846–3885.
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Mukherjee, B.K., Indira, K. & Dani, K.K. Perturbations in tropical middle atmosphere during winter, 1984–1985. Meteorl. Atmos. Phys. 37, 17–26 (1987). https://doi.org/10.1007/BF01047007
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DOI: https://doi.org/10.1007/BF01047007