State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Environ Monit Assess. 2023 Nov 28;195(12):1540. doi: 10.1007/s10661-023-12113-9.
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., Ca: 32.71 μeq/L; [Formula: see text]: 1.73 μeq/L) were significantly higher than those at a site around 2.2 Km away (Ca: 11.47 μeq/L; [Formula: see text]: 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.
偏远地区通常被认为是长距离输送污染物的受体。监测站是调查偏远地区大气环境的重要平台。然而，这些监测站周围非常局部的源对其大气环境可能产生重要影响，而这方面的研究还很少。本研究同时在青藏高原典型偏远站（纳木错站）和其他附近站点（被称为“世界第三极”）调查了降水的主要离子。结果表明，尽管纳木错站（如 Ca：32.71 μeq/L；[Formula: see text]：1.73 μeq/L）降水的主要离子浓度与其他偏远地区相比仍较低，但明显高于距离约 2.2 公里处的站点（Ca：11.47 μeq/L；[Formula: see text]：0.64 μeq/L）。这直接证明了纳木错站的大气环境受到来自地表土壤的矿物质粉尘和污染物以及站本身人为污染物的显著影响。因此，站上报到的许多其他相关数据受到影响。例如，纳木错站报告的气溶胶浓度和一些人为污染物可能被高估。同时，建议在选择偏远地区大气环境监测站点时要谨慎，以减少当地源的潜在影响。
