摘要
应用场发射扫描电镜(FESEM)对青藏高原纳木错综合观测站和香格里拉本底站2011年7～8月份不同天气情况下收集的气溶胶样品进行研究。结果表明,区域内气溶胶单颗粒类型主要包括烟尘集合体、球形颗粒(焦油球、燃煤飞灰)、似球形颗粒、矿物颗粒、生物颗粒等,香格里拉的球形颗粒中出现了飞灰颗粒,而纳木错样品中没有。纳木错气溶胶颗粒的数量-粒度峰值和体积-粒度峰值分别出现在0.2～0.3μm和1～2.5μm,矿物颗粒数量和体积最多,分别占44.4%和61.7%。香格里拉气溶胶颗粒的数量-粒度峰值和体积-粒度峰值都呈现双峰分布,主峰均分布在>2.5μm范围,矿物颗粒数量和体积最多,分别占51.7%和58.7%。细粒子和粗粒子分别为纳木错和香格里拉气溶胶的主要类型。纳木错气溶胶中矿物颗粒最多,数量百分比为44.4%,其次为烟尘集合体(29.5%)和球形颗粒(26.1%),香格里拉气溶胶中矿物颗粒数量百分比为51.7%,其次为球形颗粒(29%)和烟尘集合体(19.3%);纳木错气溶胶总颗粒物主要分布在0.2～0.3μm粒径范围中,数量百分比为32.59%,其中矿物颗粒最多(15%),其次为球形颗粒(11.5%)和烟尘集合体(6.1%)。香格里拉气溶胶颗粒物主要分布在>2.5μm粒径范围中,数量百分比为37.5%,其中矿物颗粒最多(17.9%),其次为球形颗粒(10%)和烟尘集合体(9.6%)。
Field emission scanning electron microscopy （FESEM） was used to study the aerosol samples collected in Nam Co and air of Shangri-La under different weather conditions during July～August,2011.The results showed that particles could be subdivided into 5 major morphological categories,namely soot aggregates,spherical particles （tar ball and fly ash）,spherical particles,mineral particles and bio-particles.There existed fly ash in Shangri-La aerosol samples,which however did not exist in Nam Co.Number-size and volume-size distribution of particles in Nam Co aerosol samples displayed peaks in the size range of 0.2～0.3μm and 1 ～2.5μm.The proportion of quantity（44.4 ％）and that of volume（61.7 ％）of mineral particles were the highest; size distribution of particles in Shangri-La aerosol samples displayed two major peaks in the size range of over 2.5μm.The proportion of quantity （51.7％） and that of volume （58.7％） of mineral particles were the highest.Fine particles and coarse particles were the major types of aerosol samples of Nam Co and Shangri-La respectively.The amount （44.4％） of mineral particles was the highest in Nam Co,followed by soot aggregates （29.5％） and spherical particles （26.1％）.The quantity proportion （32.59％） of Nam Co aerosol samples was mainly in the size range of 0.2～0.3 μm.Mineral particles were the highest （15％）,followed by spherical partides （11.5％） and soot aggregates （6.1％）.The quantity proportion （37.5％） of Shangri-La aerosol samples was mainly in the size range of over 2.5 μm.Mineral particles were the highest （17.9％）,followed by spherical particles （10 ％） and soot aggregates （9.6 ％）.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2013年第6期863-872,共10页
Acta Petrologica et Mineralogica
基金
公益性行业(气象)专项资助项目(GYHY20110623)
关键词
气溶胶
场发射扫描电镜
青藏高原
aerosol
field emission scanning electron microscopy （FESEM）
Tibetan Plateau
