Contact: Markus Furger, email@example.com
Scope of project
The project aims at studying the temporal variation of major component and trace element concentrations in airborne particulate matter (PM) and their sources in one megacity in China (People’s Republic of China, PRC) and one megacity in India. Statistical source apportionment techniques will be applied to data collected during a fall field campaign in Beijing and a winter campaign in New Delhi. Ambient aerosols will be sampled with 3-stage rotating drum impactors (RDI) segregating the aerosol into the size classes 10-2.5 μm, 2.5 – 1.0 μm, 1.0 – 0.1 μm, in combination with black carbon measurements with aethalometers. The samples are analyzed with synchrotron radiation induced X-ray fluorescence spectrometry (SR-XRF), which yields concentration time series for more than 20 elements (Na to Pb). Pairwise sampling (two RDI/aethalometer combinations at two sites in the same city) will allow for the identification of local and regional pollution, long-range transport, urban increments, and other PM characteristics. The 60-min time resolution allows for the quantitative analysis of diurnal and weekly variations of PM concentrations. An switching system allows for alternating collection of PM10 and PM2.5. Combination of trace elements with aethalometer black carbon and 14C promises to improve the identification of coal combustion, traffic and other industrial sources by their fossil/non-fossil characteristics. Trace elements combined with organics from aerosol mass spectrometry improves the source apportionment of organics in PM.