The online measured black carbon aerosol and source orientations in the Nam Co region, Tibet.
The online measured black carbon aerosol and source orientations in the Nam Co region, Tibet.
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DOI：
10.1007/s11356-017-0165-1
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发表时间：
2017-11
期刊：
影响因子：
--
通讯作者：
Zhang G
中科院分区：
文献类型：
--
作者：
Zhang X;Ming J;Li Z;Wang F;Zhang G
2010 - 2014年，利用AE-31型大气蒸发仪对西藏纳木错地区的等效黑碳（eBC）质量浓度进行了测定。不同于先前的过滤器采样研究（Ming等人，J Environ Sci 22（11）：1748-1756; Zhao等人，Environ Sci Pollut Res 20：5827-5838，），首次在西藏中部进行了高分辨率的eBC在线测量，讨论了eBC的日变化和季节变化。平均每日eBC浓度为74 ± 50 ng/m3，反映了全球背景水平。气象条件对eBC浓度的影响主要表现在季节尺度上，2 - 5月较高，6 - 1月较低。最高的eBC浓度（大于210 ng/m3）与小于6 m/s的W和WSW风更相关。EBC的日变化在10：00 - 15：00之间呈现出具有季节性变化的平台，与当地的人类活动有关，如土著藏族焚烧动物粪便和旅游交通。PBLH显示出与eBC浓度的协方差，涉及近源。在纳木错观测站（NCOS）所包括的分区（30° N-40° N，90° E-100° E），利用MODIS资料反演的气溶胶光学厚度与eBC浓度有显著的相关性。这表明，附近或短距离的来源，而不是长距离传输的污染物可能是重要的贡献者在NCOS的eBC浓度，从以前的研究所提出的结论不同。
Equivalent black carbon (eBC) mass concentrations were measured by an aethalometer (AE-31) in the Nam Co, central Tibet from 2010 to 2014. Different from previous filter-sampling studies (Ming et al., J Environ Sci 22(11):1748–1756,; Zhao et al., Environ Sci Pollut Res 20:5827–5838,), the first high-resolution online eBC measurement conducted in central Tibet is reported here, allowing to discuss the diurnal variations as well as seasonal variabilities of eBC. Average daily eBC concentration was 74 ± 50 ng/m3, reflecting a global background level. Meteorological conditions influenced eBC concentrations largely at seasonal scale, which are higher in February–May but lower in June–January. The highest eBC concentrations (greater than 210 ng/m3) were more associated with the W and WSW winds smaller than 6 m/s. The diurnal variations of eBC showed plateaus from 10:00 to 15:00 with seasonal variations, associated with local anthropogenic activities, such as indigenous Tibetan burning animal waste and tourism traffic. The PBLHs showed a co-variance with eBC concentrations, implicating close sources. The aerosol optical depths derived from the MODIS data over the Nam Co Observatory Station (NCOS)-included sub-area (30° N–40° N, 90° E–100° E) showed significant relationship with eBC concentrations. This suggests that nearby or short-distance sources other than long-distance transported pollutants could be important contributors to eBC concentrations at the NCOS, different from the conclusions suggested by previous studies.
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