Articles online

Aerosol Optical Depth, Ozone and Water Vapor Measurements over Gadanki, A Tropical Station in Peninsular India

Category: Articles

Volume: 8 | Issue: 4 | Pages: 459-476
DOI: 10.4209/aaqr.2008.05.0015
PDF | RIS | BibTeX

A. K. Srivastava 1, P. C. S. Devara1, Y. Jaya Rao1, Y. Bhavanikumar2, D. N. Rao2

  • 1 Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pashan, Panchawati, Pune, India
  • 2 National Atmospheric Research Laboratory, Gadanki, India


This paper reports the results of a study related to the optical and physical characteristics of columnar aerosols and variation in total column ozone (TCO) and precipitable water content (PWC) over Gadanki (13.45°N, 79.18°E), a tropical station in peninsular India, for the first time, using MICROTOPS-II (Microprocessor-based Total Ozone Portable Spectrometer), comprising of both sun photometer and ozonometer. Results show wavelength dependence of AOD, having mean value of ~0.4 (± 0.09) at 500 nm optical channel. Daily mean aerosol size spectra shows, most of the time, power-law distribution. However, its diurnal variations show significant changes in aerosol size spectra modulated by a combination of both power-law and bi-modal distributions. To characterize AOD, the Ångström parameters (i.e., α and β) were used. The day-to-day variations in TCO were found to be in fair agreement with that derived from TOMS satellite data for all the experimental days, having mean observed value of ~253 (± 8) DU over the station. Interestingly, an inverse relationship between TCO and AOD or PWC was observed over the station, on some times of the day, which could be attributed to the mixing of significant fraction of ozone with aerosol and water vapor-rich air mass. However, a significant positive correlation was observed between AOD and PWC.


Aerosols Aerosol optical depth Ångström parameters Total column ozone and precipitable water content

Related Article

Impact of Atmospheric Flow Conditions on Fine Aerosols in Sydney, Australia

Jagoda Crawford , David D. Cohen, Alan D. Griffiths, Scott D. Chambers, Alastair G. Williams, Eduard Stelcer
Volume: 17 | Issue: 7 | Pages: 1746-1759
DOI: 10.4209/aaqr.2017.02.0083
PDF | Supplemental material

A Set-up for Respiratory Tract Deposition Efficiency Measurements (15–5000 nm) and First Results for a Group of Children and Adults

Jenny Rissler , Hanna Nicklasson, Anders Gudmundsson, Per Wollmer, Erik Swietlicki, Jakob Löndahl
Volume: 17 | Issue: 5 | Pages: 1244-1255
DOI: 10.4209/aaqr.2016.09.0425
PDF | Supplemental material

Critical Emissions from the Largest On-Road Transport Network in South Asia

Saroj Kumar Sahu , Gufran Beig, Neha Parkhi
Volume: 14 | Issue: 1 | Pages: 135-144
DOI: 10.4209/aaqr.2013.04.0137

Ambient Air Quality during Diwali Festival over Kolkata – A Mega-City in India

A. Chatterjee , C. Sarkar, A. Adak, U. Mukherjee, S.K. Ghosh, S. Raha
Volume: 13 | Issue: 3 | Pages: 1133-1144
DOI: 10.4209/aaqr.2012.03.0062