A four-year size-segregated characterization study of particles PM10, PM2.5 and PM1 depending on air mass origin at Melpitz

作者：Spindler G^*; Brueggemann E; Gnauk T; Gruener A; Mueller K; Herrmann H

来源：Atmospheric Environment, 2010, 44(2): 164-173.

DOI：10.1016/j.atmosenv.2009.10.015

• Particulate matter
• Long-time measurements
• Chemical-physical characterization
• Long-range transport
• Seasonal-spatial differentiation

PM10 measurements were started in November 1992 at Melpitz site. The mean PM10 concentration in 1993 was 38 mu g m(-3) in the summer season (May until October) and about 44 mu g m(-3) in the winter season (November until April). The mean PM10 level decreased until 1999 and Varies now in ranges from 20-34 mu g m(-3) to 17-24 mu g m(-3) (minimum and maximum mean values for 1999-2008) in winter and summer seasons, respectively. High volume filter samples of particles PM10, PM2.5 and PM1 were characterized for mass, water-soluble ions, organic and elemental carbon from 2004 until 2008. The percentage of PM2.5 in PM10 varies between summer (71.6%) and winter seasons (81.9%). Mean concentrations of PM10, PM2.5 and PM1 in Melpitz were 20,15, and 13 mu g m(-3) in 2004,22,18, and 13 mu g m(-3) in 2005, 24,19, and 12 mu g m(-3) in 2006 and 22,17, and 12 mu g m(-3) in 2007, respectively. In the four winters the rural background concentration PM10 at Melpitz exceeded the daily 50 mu g m(-3) limit for Europe on 8, 8, 7 and 6 days, respectively.
Findings for a simple two-sector-classification of the samples (May 2004 until April 2008) using 96-h backward trajectories for the identification of source regions are: Air masses were transported most of time (60%) from the western sector and secondly (17%) from the eastern sector. The lowest daily mean mass concentration PM10 were found during western inflow in summer (17 mu g m(-3)) containing low amounts of sulphate (2.4 mu g m(-3)), nitrate (1.7 mu g m(-3)), ammonium (1.1 mu g m(-3)) and TC (3.7 mu g m(-3)). In opposite the highest mean mass concentration PM10 was found during eastern inflow in winter (35 mu g m(-3)) with high amounts of sulphate (6.1 mu g m(-3)), nitrate (5.4 mu g m(-3)), ammonium (3.8 mu g m(-3)) and TC (9.4 mu g m(-3)). An estimation of secondary formed OC(SOA) shows 0.8-0.9 mu g m(-3) for air masses from West and 2.1-2.2 mu g m(-3) from East. The seasonal difference can be neglected.
The half-hourly measurements of the particle mass concentration PM10 evaluated as mean daily courses using a TEOM (R) show low values (14-21 mu g m(-3)) in summer and winter for air masses transported from West and the highest concentrations (31-38 mu g m(-3)) in winter for air masses from East.
The results demonstrate the influence of meteorological parameters on long-range transport, secondary particle mass formation and re-emission which modify mass concentration and composition of PM10, PM2.5 and PM1. Melpitz site is located in the East of Germany faraway from strong local anthropogenic emissions (rural background). Therefore, this site is suitable for investigation of the influence of long-range transport of air pollution in continental air masses from the East with source regions inside and outside of the European Union.

• 出版日期2010-1