Morphological Characteristics of Atmospheric Aerosols with Different Sizes in Xiamen During Autumn

应用场发射扫描电镜(fESEM)研究了厦门城区秋季(2013年11月)不同粒径大气颗粒物的微观形貌及其元素组成特征.结果表明,厦门城区的大气颗粒物主要有烟尘集合体、飞灰颗粒、矿物颗粒、生物颗粒等.在粗粒径范围(>2.5μM),不规则矿物颗粒占多数,主要来自路面或建筑扬尘;细粒径颗粒物(2.5μm),mainly originating from road dust and construction dust.The composition of fine particles(<1.0μm)were mainly sulphates and nitrates.Soot aggregates and fly ashes almost appeared in every scope of sizes of aerosols,indicating that fine particles discharged from combustion evolved from small sizes to big ones because of agglomeration.All these features indicated that the particles mainly originated from fossil fuel burning,motor vehicle particles,dusts over the Xiamen City in autumn 2013,and much attention should be paid to control air pollution.国家自然科学基金(41171365;40971257); 厦门大学山海基金(2013SH011