Some experiments on the determination of the structure and refractive index of the lower troposphere (lowest 200 ft) over Dum Dum Airport, Calcutta
DOI:
https://doi.org/10.54302/mausam.v10i3.4064Abstract
The results of low level (lowest 200 ft) radiosonde sounding made on certain s3lected dates and at certain selected hours during the winter season of 1956-57 and pre-monsoon season of 1957 over Dum Dum airport are discussed. The results indicated the formation of ducts at certain hours. The variations of the meteorological data with the progress of night are shown in a tabular form.
The radarscope observations at the corresponding hours are also discussed. On two occasions in March and Apri11957, the duct heights were abnormally high and prevailed for the whole night persisting till or even after sunrise. It is shown that these ducts extended horizontally in all directions to about 60 miles. Some radarscope observations during February-March 1956 are also discussed. On two occasions during February 1956 elevated ducts were noticed. These prevailed for the whole night. The attenuation produced by the appearance of thick fog over the station and its masking effect on the ground clutters are also discussed.
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