G.V. Pawar1, P.C.S Devara2, S.D. More3, P. Pradeep Kumar3, G.R. Aher 1

  • 1 Physics Department, Nowrosjee Wadia College, Pune 411 001, India
  • 2 Indian Institute of Tropical Meteorology, Pashan, Pune 411 008, India
  • 3 Department of Atmospheric and Space Sciences, University of Pune, Pune 411 007, India

Received: September 30, 2011
Revised: February 10, 2012
Accepted: February 10, 2012
Download Citation: ||https://doi.org/10.4209/aaqr.2011.09.0157  

  • Download: PDF

Cite this article:
Pawar, G., Devara, P., More, S., Kumar, P.P. and Aher, G. (2012). Determination of Aerosol Characteristics and Direct Radiative Forcing at Pune. Aerosol Air Qual. Res. 12: 1166-1180. https://doi.org/10.4209/aaqr.2011.09.0157



Simultaneous measurements of aerosol optical depth and incoming global solar flux were carried out with a MICROTOPS-II Sunphotometer and Eppley Precision Spectral Pyranometer over Nowrosjee Wadia College (NWC, Pune) as the nodal centre, and at Pune University (PU) and IUCAA Girwali Observatory (IGO), in a field campaign mode during December 2010–May 2011. Data was analyzed to determine the surface short-wave (SW) aerosol direct radiative forcing (ADRF, ∆F per unit 0.1 AOD) and to study the characteristics of the aerosols. The results indicate that ADRF shows significant day-to-day variability and co-varies with AOD. The cause of the day-to-day variation in ADRF is an anti-correlation between ADRF/AOD, and differences in the daily maximum minus minimum RH and temperature. At NWC, ADRF ranges between –37.7 W/m2 (highest) and –5.9 W/m2 (lowest). For 500 nm, ADRF takes values in the range –17.3 ± 7.1 W/m2 to –54.2 ± 5.5 W/m2 at PU, whereas the corresponding values at IGO are –15.1 ± 2.1 W/m2 and –36.6 ± 6.4 W/m2. Monthly ADRF is at the minimum level in winter and maximum during the pre-monsoon period. The magnitude of AOD shows significant diurnal variability. In winter, the mean AOD diurnal percentage departure at 500 nm is positive in the morning and negative during the afternoon, and this is reversed in the pre-monsoon period. The diurnal cycle of AOD is related to the prevalent meteorological conditions, surface-based nocturnal temperature inversion in the atmospheric boundary layer (ABL), and influx of aerosols from different source regions.

Keywords: Aerosol optical depth; Aerosol radiative effects; SW solar flux

Share this article with your colleagues 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

77st percentile
Powered by
   SCImago Journal & Country Rank

2022 Impact Factor: 4.0
5-Year Impact Factor: 3.4

Call for Papers for the special issue on: "Carbonaceous Aerosols in the Atmosphere"

Aerosol and Air Quality Research partners with Publons

CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit
CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal that promotes submissions of high-quality research and strives to be one of the leading aerosol and air quality open-access journals in the world. We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.