State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100039, China.
State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100039, China.
Environ Pollut. 2022 Oct 15;311:119858. doi: 10.1016/j.envpol.2022.119858. Epub 2022 Aug 11.
Carbonaceous particles are an important radiative forcing agent in the atmosphere, with large temporal and spatial variations in their concentrations and compositions, especially in remote regions. This study reported the ΔC and δC of total carbon (TC) and water-insoluble particulate carbon (IPC) of the total suspended particles (TSP) and PM at a remote site of the eastern Tibetan Plateau (TP), a region that is influenced by heavy air pollution from Southwest China. The average organic carbon and elemental carbon concentrations of TSP samples in this study were 3.20 ± 2.38 μg m and 0.68 ± 0.67 μg m, respectively, with low and high values in summer and winter, respectively. The fossil fuel contributions of TC in TSP and PM samples were 18.91 ± 7.22% and 23.13 ± 12.52%, respectively, both of which were far lower than that in Southwest China, indicating the importance of non-fossil contributions from local sources. The δC of TC in TSP samples of the study site was -27.06 ± 0.96‰, which is between the values of long-range transported sources (e.g., Southwest China) and local biomass combustion emissions. Therefore, despite the contribution from the long-range transport of particles, aerosols emitted from local biomass combustion also have an important influence on carbonaceous particles at the study site. The findings of this work can be applied to other remote sites on the eastern TP and should be considered in related research in the future.
碳质颗粒是大气中一种重要的辐射强迫剂，其浓度和组成在时间和空间上都有很大的变化，尤其是在偏远地区。本研究报道了青藏高原东部偏远地区（TP）总悬浮颗粒物（TSP）和 PM 中总碳（TC）和水不溶性颗粒碳（IPC）的 ΔC 和 δC，该地区受来自中国西南地区的严重空气污染影响。本研究中 TSP 样品的有机碳和元素碳浓度平均值分别为 3.20 ± 2.38 μg m 和 0.68 ± 0.67 μg m，夏季和冬季的浓度值分别较低和较高。TC 在 TSP 和 PM 样品中的化石燃料贡献分别为 18.91 ± 7.22%和 23.13 ± 12.52%，均远低于中国西南地区，表明当地来源的非化石贡献的重要性。研究地点 TSP 样品中 TC 的 δC 为-27.06 ± 0.96‰，介于长程传输源（例如，中国西南地区）和当地生物质燃烧排放源之间。因此，尽管有颗粒长程传输的贡献，但当地生物质燃烧排放的气溶胶对研究地点的碳质颗粒也有重要影响。本研究结果可应用于青藏高原东部的其他偏远地区，未来相关研究也应考虑这一点。
