Abstract
Remote region is normally considered a receptor of long-range transported pollutants. Monitoring stations are important platforms for investigating the atmospheric environment of remote regions. However, the potential contribution of very local sources around these stations may produce important influences on its atmospheric environment, which is still barely studied. In this study, major ions of precipitation were investigated simultaneously at a typical remote station (Nam Co station) and other sites nearby on the Tibetan Plateau (TP) — the so-called “The Third Pole” in the world. The results showed that despite low values compared to those of other remote regions, the concentrations of major ions in precipitation of Nam Co station (e.g., Ca2+: 32.71 μeq/L; \(\mathrm{SO}_4^{2-}\): 1.73 μeq/L) were significantly higher than those at a site around 2.2 Km away (Ca2+: 11.47 μeq/L; \(\mathrm{SO}_4^{2-}\): 0.64 μeq/L). This provides direct evidence that atmospheric environment at Nam Co station is significantly influenced by mineral dust and pollutants emitted from surface soil and anthropogenic pollutants of the station itself. Therefore, numbers of other related data reported on the station are influenced. For example, the aerosol concentration and some anthropogenic pollutants reported on Nam Co station should be overestimated. Meanwhile, it is suggested that it is cautious in selecting sites for monitoring the atmospheric environment at the remote station to reduce the potential influence from local sources.
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Funding
This work was supported by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (2019QZKK0605), the NSFC (41971096, 41977397), CAS “Light of West China” Program (E0900104), and the State Key Laboratory of Cryospheric Science (SKLCS-ZZ-2022).
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Yixi Liu: methodology, investigation, resources, writing — original draft, writing — review and editing. Chao Zhang: investigation, methodology, writing — review and editing. Fangping Yan: resources, investigation, writing — review and editing. Yinbo Xu: investigation. Pengling Wang: writing — review. Chaoliu Li: conceptualization, resources, methodology, investigation, validation, writing — review editing, supervision, project administration, and funding acquisition.
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Liu, Y., Zhang, C., Yan, F. et al. Significant spatial variations of the atmospheric environment at remote site of the Tibetan Plateau — a case study on major ions of precipitation around Nam Co station. Environ Monit Assess 195, 1540 (2023). https://doi.org/10.1007/s10661-023-12113-9
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DOI: https://doi.org/10.1007/s10661-023-12113-9