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Air-quality monitoring by optical and acoustic radars at Pune, India

Devara, PCS and Maheskumar, RS and Murthy, BS and Vernekar, KG (1997) Air-quality monitoring by optical and acoustic radars at Pune, India. Measurement Science and Technology, 8 (10). pp. 1160-1165.

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The co-located optical (argon-ion lidar) and acoustic (Doppler sodar) radar systems at the Indian Institute of Tropical Meteorology (IITM), Pune (, , 559 m AMSL), India, have been employed to study the nocturnal aerosol pollution dynamics or air quality. Both the systems have been operated simultaneously in order to sample the common atmospheric volume. The results of the experiments thus conducted on some typical nights are presented in this paper. The time - height cross section of the mean, horizontal and vertical components of the wind field derived from the sodar observations indicate that the wind is either easterly or northerly with its vertical component negative (downdraft) for most of the observational period. The interesting feature is that the winds are either calm or relatively weaker in the night-time boundary layer compared with those in the region aloft. This is more evident in the north - south direction in which the lidar and sodar equipment are located. Furthermore, the regions where stable/elevated layer formation is active are found to be associated with the smallest wind gradients, leading to accumulation of aerosol particles or larger temperature structure parameters. The time evolution of the mixed-layer heights and the associated ventilation coefficients, determined from the combined lidar - aerosol and sodar - wind observations, are found to be useful to explain the transport and diffusion of pollutants across the elevated temperature inversions over the experimental station. The details of the experimental techniques are presented and their value for application in the study of regional air quality and pollution potential is discussed

Item Type: Article
Additional Information: Copyright of this article belongs to IOP Publishing Limited
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 28 Feb 2015 05:27
Last Modified: 28 Feb 2015 05:27

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