Haze particles over a coal-burning region in the China Loess Plateau in winter: Three flight missions in December 2010

摘要: [1] Heavy haze frequently occurs in winter over a coal-burning region, the Taiyuan Basin, eastern China Loess Plateau, which is upstream area of North Plain. We participated three research flights to collect aerosol particles and monitor SO2concentration hazes from ground (780 m asl) up ∼4000 m during 17–18 December, 2010. Meteorological records reveal that whole column (ground 4000 m) was stable could be further divided into sub-layers depending on sampling altitude, are characterized by two shifts lapse rate virtual potential temperature water vapor mixing ratio: Layer-1, surface 1500 m; Layer-2, 1500 ∼ 3000 m 17 1500 ∼ 2500 m 18 December; Layer-3, above 3000 m December 2500 m December. 16–116 ppb with an average 58 ppb 2–45 ppb 10 ppb 1–10 ppb 4 ppb Layer-3. The accumulation SO2in Layer-1 due meteorological conditions strong anthropogenic emissions addition possible valley topography. Analyses collected using transmission electron microscope revealed dominance organic fly ash Layer-2 sulfate aerosols contained certain amounts Si Cl. Fly consisted O minor Fe, Mn, Zn, Ti, Pb, As, Co, Cr. These types typically emitted coal burning. results indicate were principle primary burning, different those Plain where secondary dominant component.