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pure and applied geophysics

, Volume 117, Issue 4, pp 583–598 | Cite as

Characteristic features of atmospheric aerosols over India and their role in warm rain process

  • R. K. Kapoor
  • K. K. Kanuga
  • S. K. Paul
  • S. K. Sharma
Article

Abstract

Atmospheric aerosols are a crucial link in the physical processes, involved in the formation and growth of precipitating clouds. Extensive aerosol measurements in surface air and in the lower troposphere were made at inland and coastal stations of different regions in India. At inland stations, the hygroscopic fraction of the total aerosol content is found to be a useful characteristic for distinguishing between the monsoon and summer airflow, as well as an indicator for a good or a badly developed monsoon. At coastal stations, however, this feature is not observed.

Measurements as a function of height brought out that the aerosol varied widely in air over different seasons. During monsoon, the hygroscopic fraction was found highest at the cloud base level and was closely linked to the development of rain. Details of these investigations are presented.

Key words

Atmospheric aerosols Warm rain Hygroscopic fraction Rain activity 

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References

  1. Biswas, K. R., Paul, S. K., andRamana Murty, Bh. V. (1968),Giant size aerosols in lower troposphere at Delhi, Proc. Int. Conf. on Cloud Physics, August 26–30, 1968, Toronto, Canada, 50–56.Google Scholar
  2. Braham, R. R., Jr. (1964),What is the role of ice in summer rain showers, J. Atmos. Sci.20, 563–568.Google Scholar
  3. Braham, R. R., Jr., andDungey, M. (1976),Effect of a large city upon convective clouds and coalescence rain, Proc. Int. Conf. on Cloud Physics, July 26–30, 1976, Boulder, Colo., USA, 275–278.Google Scholar
  4. Kapoor, R. K., Sekhon, R. S., Ramachandra Murty, A. S., andRamana Murty, Bh. V. (1969),Iceforming nuclei and their dominant source region, J. Meteor. Soc. Japan47, 219–226.Google Scholar
  5. Kapoor, R. K., Paul, S. K., Khemani, L. T., Sharma, S. K., Murty, A. S. R., Krishna, K., andRamana Murty, Bh. V. (1976),Cloud droplet spectra, aerosol concentrations and rain activity in maritime, modified maritime and continental regions, Proc. Int. Conf. on Cloud Physics, July 26–30, 1976, Boulder, Colo., USA, 442–445.Google Scholar
  6. Kessler, E. (1973),On the artificial increase in precipitation, Weather28, 188–194.Google Scholar
  7. May, K. R. (1945),The cascade impactor—an instrument for sampling coarse aerosols, J. Sci. Instrum.22, 187–195.Google Scholar
  8. Ramana Murty, Bh. V., Biswas, K. R., andGhosh Dastidar, B. K. (1960),Incidence of ‘warm’ and ‘cold’ rain in and around Delhi and their contributions to season's rainfall, Indian J. Meteor. Geophys.11, 331–346.Google Scholar
  9. Ramana Murty, Bh. V., Srivastava, R. C., andKapoor, R. K., (1962),‘Giant’ hygroscopic nuclei in surface air at Delhi, Indian J. Meteor. Geophys.13, Spl. 9–16.Google Scholar
  10. Ramana Murty, Bh. V., Roy, A. K., andKapoor, R. K. (1967),Sources of origin and meteorological importance of hygroscopic and ice-forming nuclei, Tellus19, 136–142.Google Scholar
  11. Rosinski, J. (1974),Role of aerosol particles in formation of precipitation, Rev. of Geophys. Space Phys.12, 129–134.Google Scholar
  12. Sekhon, R. S., andRamana Murty, Bh. V. (1965),Some studies on atmospheric particulate matter at Delhi, Indian J. Meteor. Geophys.16, 201–212.Google Scholar
  13. Sekhon, R. S., andRamana Murty, Bh. V. (1966),Some characteristic features of hygroscopic and non-hygroscopic aerosols at Delhi, J. Atmos. Sci.23, 771–777.Google Scholar
  14. Takahashi, T. (1974),Effective cloud nuclei size range for the formation of raindrops in maritime warm clouds, In preprints of Cloud Physics Conf., American Meteorological Society, Tucson, Arizona, October, 205–210.Google Scholar
  15. Woodcock, A. H., Duce, R. A. andMoyers, J. L. (1971),Salt particles and raindrops in Hawaii, J. Atmos. Sci.28, 1252–1257.Google Scholar

Copyright information

© Birkhäuser Verlag 1978

Authors and Affiliations

  • R. K. Kapoor
    • 1
  • K. K. Kanuga
    • 1
  • S. K. Paul
    • 1
  • S. K. Sharma
    • 1
  1. 1.Indian Institute of Tropical MeteorologyPoonaIndia

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