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Atmospheric boundary layer studies at Jodhpur during MONTBLEX using sodar and tower

  • B. S. Gera
  • S. P. Singal
  • Neeraj Saxena
  • Y. S. Ramakrishna
Article
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Abstract

A monostatic sodar was set up at Jodhpur, near the western end of the monsoon trough, to investigate the atmospheric boundary layer dynamics. A 30 m instrumented tower was also located close to the sodar antenna. Data were collected from June to August during the monsoon period of 1990, as also from July 1992 to September 1993.

Thermal plumes, surface-based stable layers (both flat or short spiky top and tall spiky top), elevated/multi-layers with or without undulations and dot echo structures were seen; however, erosion of the morning inversion layer in the form of a rising layer with growing thermal plumes under it was rarely seen, and that too only during the winter period. The observed structure of the stable layer with tall spikes and its depth have been found to be correlated with the intensity of the monsoon spell; the dot echoes have been found to be correlated with the approach of a monsoon depression near Jodhpur; and the elevated/multilayers have been attributed to the formation of a subsidence (shear instability).

Keywords

Sodar MONTBLEX monsoon trough boundary layer atmosphere thermal structure rainfall 

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References

  1. Brown E H and Hall F F Jr 1978 Advances in atmospheric acoustics;Rev. Geophys. Space Phys. 16 47–110CrossRefGoogle Scholar
  2. Goel Malti and Srivastava H N 1989 MONTBLEX;Vayu Mandai,20 1–8Google Scholar
  3. Gossard E E and Hooke W H 1975Waves in the Atmosphere, (New York: Elsevier)Google Scholar
  4. Singal S P and Gera B S 1982 Acoustic remote sensing of the boundary layer;Proc. Indian Acad. Sci. (Engg. Sci.)5 131–157Google Scholar
  5. Singal S P, Gera B S and Aggarwal S K 1985 Studies of the sodar observed dot echo structures;Atmosphere-Ocean 23 304–312Google Scholar
  6. Singal S P, Gera B S, Pahwa D R and Aggarwal S K 1986 Studies of sodar surface based shear echo structures;Atmos. Res. 20, 125–131CrossRefGoogle Scholar
  7. Singh R S, Ramakrishna Y S, Rao A S, Prabhu A and Vasudev S 1992 Quantification of some weather features in arid surface boundary layer;Proc. of Workshop on Preliminary Scientific Results of MONTBLEX, 16th–17th January, 1992, I.I.Sc., Bangalore, pp. 35–43Google Scholar

Copyright information

© Indian Academy of Sciences 1996

Authors and Affiliations

  • B. S. Gera
    • 1
  • S. P. Singal
    • 1
  • Neeraj Saxena
    • 1
  • Y. S. Ramakrishna
    • 2
  1. 1.National Physical LaboratoryNew DelhiIndia
  2. 2.Central Arid Zone Research InstituteJodhpurIndia

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