OPEN ACCESS

Articles online

Variability of Aerosol Parameters Derived from Ground and Satellite Measurements over Varanasi Located in the Indo-Gangetic Basin

Category: Articles

Volume: 13 | Issue: 2 | Pages: 627-638
DOI: 10.4209/aaqr.2012.06.0162
PDF | RIS | BibTeX

S. Tiwari, A.K. Singh

  • Atmospheric Research Laboratory, Department of Physics, Banaras Hindu University, Varanasi – 221005, India

Abstract

Atmospheric aerosol plays a very important role in the Earth’s radiation budget and global climate studies. This study reports the variability of the physical and optical properties of columnar aerosol and water vapour over Varanasi (25.2°N, 82.9°E), located in the heart of the Indo-Gangetic Basin, for the first time. The study was carried out using a MICROTOPS-II sunphotometer to measure the Aerosol Optical Depth (AOD) and metrological parameters. It is observed that the AOD loading is enhanced during the pre-monsoon and winter seasons, while it is decreased during the monsoon season. The variability of the angstrom coefficient (α) and turbidity coefficient (β) shows that in the pre-monsoon season coarse-mode aerosol particles are dominant, while fine-mode aerosol particles are dominant in the winter. We compared our MICROTOPS-II ground-based data with the level-3 data from the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard Terra satellite. A good seasonal correlation (correlation coefficient, R2 ~0.57) was observed between MICROTOPS-II and MODIS AOD data. The results of the variability of water vapor over Varanasi are also discussed. The correlation coefficient (R2) between daily MICROTOPS-II and MODIS water vapor is found to be more than 0.85 for the year 2011.

Keywords

Aerosols Aerosol optical depth Indo-Gangetic basin Angostrom exponent


Related Article

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

A. K. Srivastava , P. C. S. Devara, Y. Jaya Rao, Y. Bhavanikumar, D. N. Rao
Volume: 8 | Issue: 4 | Pages: 459-476
DOI: 10.4209/aaqr.2008.05.0015
PDF

Modulation in Direct Radiative Forcing Caused by Wind Generated Sea-Salt Aerosols

Nishi Srivastava , S.K. Satheesh
Volume: 16 | Issue: 11 | Pages: 2869-2883
DOI: 10.4209/aaqr.2015.07.0462
PDF

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
PDF

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
PDF
;