Atmospheric aerosols local–regional discrimination for a semi-urban area in India

In the European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI), measure- ments were carried out with a sequential filter-based aerosol sampler and on-line instruments for aerosol composition and behaviour at Gual Pahari, close to New Delhi. In fine mode (PM2.5), the secondary organic carbon (SOC) to total organic carbon ratio was 46%. This indicated that condensation of SOC on fine size particles could occur rapidly which may be related to the growth of aerosols and the potential to the size of cloud conden- sation nuclei in the region. Source region discrimination was improved significantly through coupling conditional probability functions with receptor modelling, and validation through volume size distribution. The air masses from industrial and dense populated regions show a mix of local as well as regional emissions to fine mode aerosols. The back-trajectory analysis captured the long-range transport of sea-salt aerosols enriched with mineral dust. The surface wind directions identified the influence of local emission activities.

HOODA Rakesh K.;  HYVARINEN A;  VESTENIUS Mika;  GILARDONI Stefania;  SHARMA V. P.;  VIGNATI Elisabetta;  KULMALA M;  LIHAVAINEN H; 

2015-11-11

ELSEVIER SCIENCE INC

JRC81443

0169-8095,   

http://www.sciencedirect.com/science/article/pii/S0169809515002598,    https://publications.jrc.ec.europa.eu/repository/handle/JRC81443,   

10.1016/j.atmosres.2015.08.014,