First measurement of atmospheric mercury species in Qomolangma Natural Nature Preserve, Tibetan Plateau, and evidence oftransboundary pollutant invasion
作者： Huiming Lin , Yindong Tong , Xiufeng Yin , Qianggong Zhang , Hui Zhang
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摘要: Abstract. Located in the world's “third pole” and a remote region connecting Indian plate Eurasian plate, Qomolangma National Nature Preserve (QNNP) is an ideal region to study long-range transport of atmospheric pollutants. In this study, gaseous elemental mercury (GEM), gaseous oxidized (GOM) particle-bound (PBM) were continuously measured during monsoon transition period QNNP. A slight increase GEM concentration was observed from preceding the Indian summer ( 1.31±0.42 ng m −3 ) Indian summer 1.44±0.36 ), while significant decreases were GOM PBM concentrations, with concentrations decreasing 35.2±18.6 19.3±10.9 pg m p for 30.5±12.5 24.9±19.8 ( PBM. A unique daily pattern was observed QNNP respect concentration, with peak value before sunrise low at noon. Relative (low) concentrations (with mean value of 21.4±13.4 , n=1239 relatively high compared values some other regions of China. A cluster analysis indicated that air masses transported changed significantly different stages monsoon, major potential mercury (Hg) sources shifted northern India western Nepal eastern Bangladesh. As there large area covered glaciers QNNP, local glacier winds could transboundary transport pollutants transport polluted Tibetan Plateau. The Hg concentration in influenced by transboundary Hg flows. This highlights need more specific identification Hg sources impacting underscores importance international cooperation regarding global controls.
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