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Study of aerosol optical depth, ozone, and precipitable water vapour content over Sinhagad, a high-altitude station in the Western Ghats

Vijayakumar, K and Devara, PCS (2013) Study of aerosol optical depth, ozone, and precipitable water vapour content over Sinhagad, a high-altitude station in the Western Ghats. International Journal of Remote Sensing, 34 (2). pp. 613-630.

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Abstract

This article reports the results of a study related to variations in columnar aerosol optical depth (AOD), total column ozone (TCO), and precipitable water content (PWC) over a high-altitude station, Sinhagad (18° 21′ N, 73° 45′ E, 1450 m above mean sea level (AMSL)), employing a microprocessor-based total ozone portable spectrometer, MICROTOPS-II, comprising both a sun photometer and ozonometer, during November 2009–April 2010. The aerosol optical depth at 500 nm (AOD500 nm) portrayed seasonal variation with higher values (0.39) in summer and lower values (0.15) in winter. The TCO and PWC also exhibited lower values in winter and started increasing by the pre-monsoon season. The Ångström wavelength exponent, α, was found to be high (1.79) during February, indicating the relative dominance of accumulation-mode particles. During the summer season, the lower value (0.94) of the Ångström wavelength exponent indicates the relative dominance of coarse-mode particles. The ground-based observations from MICROTOPS-II revealed good correlation with satellite observations of the Moderate Resolution Imaging Spectroradiometer (MODIS) and Ozone Monitoring Instrument (OMI). The observed short-wave solar flux at the bottom of the atmosphere decreased due to aerosol extinction and was found to be 19 and 78 W m–2 for the winter and pre-monsoon seasons, respectively. This implies that greater concentrations of accumulation-mode particles – which are due to local anthropogenic sources – affected the down-welling radiation than those from natural sources – which are due to long-range transport processes – over the experimental location.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor and Francis.
Uncontrolled Keywords: Above mean sea level (amsl); Accumulation modes; Aerosol extinction; Aerosol optical depths; Anthropogenic sources; Down-welling radiation; Good correlations; Ground-based observations; High altitude; Long range transport; Moderate resolution imaging spectroradiometer; Natural sources; Ozone monitoring instruments; Pre-monsoon; Precipitable water content; Precipitable water vapour; Satellite observations; Seasonal variation; Short waves; Solar flux; Summer season; Sun photometers; Total column ozone; Total ozone; Wavelength exponent, Atmospheric aerosols; Atmospheric thermodynamics; Ozone; Radiometers; Satellite imagery; Sea level, Ultraviolet spectrometers, aerosol; anthropogenic source; long range transport; MODIS; optical depth; ozone; photometer; precipitable water; seasonal variation; solar radiation; water content; water vapor; wavelength, India; Western Ghats
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 10 Jun 2014 07:14
Last Modified: 10 Jun 2014 07:14
URI: http://moeseprints.incois.gov.in/id/eprint/403

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