First Measurement of Atmospheric Mercury Species in Qomolangma NaturePreserve, Tibetan Plateau, and Evidence of Transboundary Pollutant Invasion

Abstract. Located in the world’s ‘Third Pole’ and a remote region connecting the Indian Ocean plate and the Eurasian plate, Qomolangma National Nature Preserve (QNNP) is an ideal region to study the long-range transport of atmospheric pollutants. In this study, gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM) and particle-bound mercury (PBM) were continuously measured during the Indian monsoon transition period in QNNP. A slight increase in GEM concentration was observed from the period preceding the Indian Summer Monsoon (1.31±0.42 ng m−3) to the Indian Summer Monsoon period (1.44±0.36 ng m−3), while significant decreases were observed in GOM and PBM concentrations, decreasing from 35.2±18.7 to 19.1±11.0 pg m−3 and from 30.5±12.6 to 24.7±19.9 pg m−3, respectively. A unique daily pattern…