Size distribution of carbonaceous aerosols at a high-altitude site on the central Tibetan Plateau (Nam Co Station, 4730 m a.s.l.)
Size distribution of carbonaceous aerosols at a high-altitude site on the central Tibetan Plateau (Nam Co Station, 4730 m a.s.l.)
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青藏高原中部高海拔站点碳质气溶胶粒径分布（纳木错站，海拔4730 m）
DOI：
10.1016/j.atmosres.2014.08.008
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发表时间：
2015-02
影响因子：
5.5
通讯作者：
Cong, Zhiyuan
中科院分区：
文献类型：
--
作者：
Guo, Yuhong;Wen, Tianxue;Zhang, Guoshuai;Cong, Zhiyuan
大气气溶胶的化学组成和大小分布特征对环境、人类健康和气候变化具有重要影响。使用热/光学（TOR）方法对样品进行定量。TSP、PM9.0、PM2.1和pm1.0中OC和EC的总体平均浓度分别为4.61 μ m−3和0.19 μ m−3、4.52 μ m−3和0.18 μ m−3、2.72 μ m−3和0.11 μ m−3、2.11 μ m−3和0.09 μ m−3。不同气溶胶粒径OC和EC浓度均在冬季最高。低水平的EC表明，TP内部的直接人为干扰仍然微不足道。OC和EC浓度的大小分布呈双峰型变化。冬季、季风前、季风期和季风后OC峰值分别为微滴型（0.43 ~ 0.65 μm）和粗粒型（4.7 ~ 5.8 μm）；而在季风期，粗模转变为较小的尺寸仓（3.3 ~ 4.7 μm）。粗模态可能是由于粉尘颗粒的作用，而水滴模态可能是由于颗粒的生长过程造成的。对于EC，粗态峰的变化与OC相同，其他峰的变化较为复杂，冬季、季风前和季风季节的峰分别表现为水滴型（1.1 ~ 2.1 μm, 0.65 ~ 1.1 μm, 0.43 ~ 0.65 μm），季风后的峰则表现为凝结型。OC和EC浓度峰值分别出现在冬季和季风前，最低峰值分别出现在季风期和季风后。粒径分布的变化可能是由沉积、气体/颗粒交换、吸湿生长、外部混合和二次有机碳形成引起的。TP上气溶胶的OC/EC比值大多表现为高值，强调了OC在该区域的重要性。
The chemical composition and size distribution characteristics of atmospheric aerosols have important effects on the environment, human health and climate change. In this paper, we study the size distribution of carbonaceous aerosols at the remote and pristine site, Nam Co Monitoring and Research Station for Multisphere Interactions, in the inland Tibetan Plateau (TP) based on collected size-segregated aerosols during 2012. The samples were quantified using the thermal/optical (TOR) method. The overall average concentrations of OC and EC in TSP, PM9.0, PM2.1, and PM1.0were 4.61 μg m− 3and 0.19 μg m− 3, 4.52 μg m− 3and 0.18 μg m− 3, 2.72 μg m− 3and 0.11 μg m− 3, and 2.11 μg m− 3and 0.09 μg m− 3, respectively. Generally, the highest concentration of OC and EC in different aerosol size occurred during winter. The low level of EC indicated that direct anthropogenic disturbances in the interior of the TP still remain insignificant.The size distributions of OC and EC concentrations presented bimodal variations. In winter, pre-monsoon, monsoon, and post-monsoon seasons, the peaks for OC were in droplet mode (0.43–0.65 μm) and coarse mode (4.7–5.8 μm); while in the monsoon period, the coarse mode shifted to a smaller size bin (3.3–4.7 μm). The coarse mode may be due to dust particles while the droplet mode may be due to the growth process of particles. For EC, the peaks variations in coarse mode were as same as OC, while the other peaks were complicated: the peaks during winter, pre-monsoon, and monsoon seasons exhibited in droplet mode (1.1–2.1 μm, 0.65–1.1 μm, and 0.43–0.65 μm, respectively), and in post-monsoon period, the peak located in condensation mode. The highest peak concentrations for OC and EC occurred in winter and the pre-monsoon period, while the lowest peak values in the monsoon and post-monsoon periods, respectively. The size distribution variations may be caused by deposition, gas/particles exchange, hygroscopic growth, external mixing, and secondary organic carbon formation. OC/EC ratios in aerosols over the TP mostly exhibit high values, which emphasizes the importance of OC over this region.
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影响因子：
5.2
作者：
Kaspari, S. D.;Schwikowski, M.;Mayewski, P. A.
通讯作者：
Mayewski, P. A.
影响因子：
2
作者：
R. Dmochowski
通讯作者：
R. Dmochowski
DOI：
10.1016/j.respe.2020.09.004
发表时间：
2020-10-10
期刊：
Revue D'Epidemiologie et De Sante Publique
影响因子：
--
作者：
La rédaction
通讯作者：
La rédaction
影响因子：
9.3
作者：
通讯作者：
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