pure and applied geophysics

, Volume 115, Issue 5–6, pp 1145–1166 | Cite as

Spectrum analysis relevant to Indian monsoon

  • Masato Murakami


Recent investigations on Indian monsoon by the method of spectrum analysis are reviewed from the viewpoint of various aspects of its application. The assessment is also made on their results and discussions. Through these processes, it emerged that there exist at least two kinds of quasi-periodic variations in the summer monsoonal fluctuation over India and adjacent regions. One appears as a spectral peak around the 5-day period and another is around the 15-day period.

The former one is conspicuous along the monsoon trough region in northern India. The results of cross-spectrum analysis show that it reflects the passage of westward-moving, synoptic-scale disturbances called monsoon lows. The latter seems to be related to the large-scale variation of monsoon activity itself, though it is also likely to have some associations with the cyclogenesis of monsoon depressions. The recent application of spectral method to this large-scale interrelation is also discussed along with the results of some non-spectral studies and the remaining problems are pointed out.

Key words

Monsoon spectrum analysis fluctuations 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Ananthakrishnan, R. andKeshavamurty, R. N. (1970),On some aspects of the fluctuations in the pressure and wind fields over India during the summer and winter monsoon seasons, Proc. Symp. Tropical Meteorology, Honolulu, Hawaii.Google Scholar
  2. Bhalme, H. N. andParasnis, S. S. (1975),5–6 days oscillations in the pressure gradients over India during SW monsoon, Indian J. Met. Geophys.26, 77–80.Google Scholar
  3. Findlater, J. (1969),A major low-level air current near the Indian Ocean during the northern summer, Quart. J. Roy. Meteor. Soc.95, 362–380.Google Scholar
  4. Hirota, I. (1975),Spectral analysis of planetary waves in the summer stratosphere and mesosphere. J. Meteor. Soc. Japan53, 33–44.Google Scholar
  5. Keshavamurty, R. N. (1972),On the vertical tilt of monsoon disturbances, J. Atmos. Sci.29, 993–995.Google Scholar
  6. Keshavamurty, R. N. (1973),Power spectra of large-scale disturbances of the Indian southwest monsoon, Indian J. Med. Geophys.24, 117–124.Google Scholar
  7. Krishnamurti, T. N. andRodgers, E. B. (1970),200 mb wind field June, July, August 1967, Tech. Report No. 70-2, Florida State University.Google Scholar
  8. Krishnamurti, T. N., Daggupaty, S. M., Fein, J., Kanamitsu, M. andLee, J. D. (1973),Tibetan high and upper tropospheric tropical circulations during northern summer, Bull. Amer. Meteor. Soc.54, 1234–1249.Google Scholar
  9. Krishnamurti, T. S. andBhalme, H. N. (1976),Oscillations of a monsoon system, Part I: Observational aspects. J. Atmos. Sci.33, 1937–1954.Google Scholar
  10. Krishnamurti, T. S., Molinari, J., Pan, H. L. andWong, V. (1977),Downstream amplification and formation of monsoon disturbances, Submitted for publication to Mon. Wea. Rev.Google Scholar
  11. Maruyama, T. (1968),Time sequence of power spectra of disturbances in the equatorial lower stratosphere in relation to the quasi-biennial oscillation, J. Meteor. Soc. Japan46, 327–342.Google Scholar
  12. Mitchell, J. M., Jr. (1966),Climatic change, WMO Tech. Note79, 33–75.Google Scholar
  13. Murakami, M. (1976),Analysis of summer monsoon fluctuations over India, J. Meteor. Soc. Japan54, 15–31.Google Scholar
  14. Murakami, M. (1977),On the structure of monsoon lows over the inland area of northern India, Submitted for publication to J. Meter. Soc. Japan.Google Scholar
  15. Murakami, T. (1972),Equatorial stratospheric waves induced by diabatic heat sources, J. Atmos. Sci.29, 1129–1137.Google Scholar
  16. Murakami, T. (1976),Cloudiness fluctuations during the summer monsoon, J. Meteor Soc. Japan54, 175–181.Google Scholar
  17. Ramage, C.,Monsoon Meteorology (Academic Press, New York 1971) 296 pp.Google Scholar
  18. Rao, Y. P. (1976),Southwest monsoon, Meteorological Monograph, Indian Meteorological DepartmentGoogle Scholar
  19. Rikiishi, K. (1976),Method of computing the power spectrum for equally spaced time series of finite length, J. Appl. Meteor.15, 1102–1110.Google Scholar
  20. Wallace, J. M. (1971),Spectral studies of tropospheric wave disturbances in the tropical western Pacifice, Rev. Geophys. Space. Phys.9, 557–612.Google Scholar
  21. Yanal, M.,Areview of recent studies of tropical meteorology relevant to the planning of GATE in Experiment Design Proposal for the GARP Atlantic Tropical Experiment, Vol. 2, Annex 1 (ICSU/WMO 1971).Google Scholar
  22. Zangvil, A. (1975),Temporal and spatial behavior of large-scale disturbances in tropical cloudiness deduced from satellite brightness data, Mon. Wea. Rev.103, 904–920.Google Scholar

Copyright information

© Birkhäuser Verlag 1977

Authors and Affiliations

  • Masato Murakami
    • 1
  1. 1.Department of MeteorologyThe Florida State UniversityTallahasseeUSA

Personalised recommendations