| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4439424 | Atmospheric Environment | 2011 | 6 Pages |
Annual measurements of the number concentrations and chemical composition of the particles with diameters greater than 10 μm (PM>10) were conducted at a coastal urban site in Japan. The number concentrations of the PM>10 showed an annual mean of 2.14 × 103 m-3, and synchronously varied with those of the particles with diameters greater than 3 μm (PM>3). The PM>10 mainly consisted of sea-salt and soil particles. NO3− and nss-SO42− were detected in the PM>10 at high concentrations. The chemical composition of the PM>10 was similar to that of the particles with diameters of 2–10 μm (PM2–10). The PM>10 would have similar sources and removal processes with the PM2–10.The dry deposition flux of the particle mass was mostly (approximately 67%) contributed by the PM>10. The PM>10 has a significant contribution to the dry deposition flux of the particulate substances. Approximately 42% of the dry deposition flux of particulate nitrate–nitrogen (NO3−–N) was contributed by the PM>10, although only 9.5% of the NO3−–N concentration was detected in the PM>10. During the summer period, especially, the contribution of the PM>10 to the dry deposition of the NO3−–N increased to approximately 51%. The present study demonstrates that the PM>10 are significant carriers for NO3−–N from the atmosphere to the earth’s surface.
► The particles with d > 10 μm (PM>10) were measured in a coastal urban site. ► Annual mean number concentration of the PM>10 was 2.14 × 103 m−3. ► Contribution of the PM>10 to dry deposition flux of NO3− was estimated to be 42 %. ► PM>10 are significant carriers for NO3− from the atmosphere to the earth’s surface.
