Lidar studies on atmospheric aerosols at a semi-urban station Cheeryal (17.51° N, 78.62° E) near Hyderabad, India

S. Pillodi; D. Ramakrishna Rao; K. Anitha Sheela; Malladi Satyanarayana

doi:10.1117/12.2223391

5 May 2016 Lidar studies on atmospheric aerosols at a semi-urban station Cheeryal (17.51° N, 78.62° E) near Hyderabad, India

S. Pillodi, D. Ramakrishna Rao, K. Anitha Sheela, Malladi Satyanarayana

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Proceedings Volume 9879, Lidar Remote Sensing for Environmental Monitoring XV; 98790T (2016) https://doi.org/10.1117/12.2223391
Event: SPIE Asia-Pacific Remote Sensing, 2016, New Delhi, India

Abstract

It is well established that atmospheric aerosol play a vital role both directly and indirectly in the Earth’s radiation budget. The transport of anthropogenic aerosol from the urban locations increases the aerosol loading in the surrounding semi-urban regions. The solid waste disposal in the semi-urban regions also adds up to the total anthropogenic aerosol density in the region. In this study we investigated the aerosol characteristics in the Cheeryal Village (17.51° N, 78.62° E), which is located at a distance of about 20 Km in the suburbs of Hyderabad, India. A multi-wavelength laser radar was developed in-house and made operational at this location about 2 years back. The Nd:YAG laser (M/S Bright Solutions, Italy) based multi-wavelength lidar operates at 532 nm and 1064 nm with a pulse energy of 50uJ at both the wavelengths. The two wavelengths are generated coaxially with a pulse width of 10ns and the laser operates up to a PRF of 4 KHz. The receiver system consists of a 360 mm Newtonian optical telescope, 10 nm of interference filters and the Licel Gmbh, Germany make 250 MHz Photon Counting recorder. Lidar observations are conducted on relatively clear days during the one year period from January 2014 to December 2014. The aerosol extinction profiles are derived and compared with the model values corresponding to the Hyderabad urban region. It is observed that there is a heavy aerosol loading periodically at this location in relation to the sources of anthropogenic aerosols at Hyderabad urban area. The role of prevailing meteorological conditions, measured in real time, on the transport of the urban aerosol to this region is studied.

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S. Pillodi, D. Ramakrishna Rao, K. Anitha Sheela, and Malladi Satyanarayana "Lidar studies on atmospheric aerosols at a semi-urban station Cheeryal (17.51° N, 78.62° E) near Hyderabad, India", Proc. SPIE 9879, Lidar Remote Sensing for Environmental Monitoring XV, 98790T (5 May 2016); https://doi.org/10.1117/12.2223391

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KEYWORDS

Aerosols

LIDAR

Clouds

Atmospheric particles

Photon counting

Signal attenuation

Pulsed laser operation

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