Selected organochlorine pesticides and polychlorinated biphenyls in atmosphere at Ruoergai high altitude prairie in eastern edge of Qinghai-Tibet Plateau and their source identifications

Forest Filter Effect versus Cold Trapping Effect on the Altitudinal Distribution of PCBs: A Case Study of Mt. Gongga, Eastern Tibetan Plateau

“…The sum of the 24 measured PCBs (Σ 24 PCBs) in the air ranged from 33 to 60 pg/m 3 with a mean value of 47 pg/m 3 . These concentrations were similar to values found in the rural Italian Alps in 2003 (25−52 pg/m 3 ), 44 lower than the latest report by Gai et al 24 (88−145 pg/m 3 ) in the Ruoergai Grassland (on the eastern edge of the Tibetan Plateau) in 2011, and within background levels for Asia (17−150 pg/m 3 ) and Europe (5.1−170 pg/m 3 ). 45 Tetra-CBs (46%) were the most abundant homologue group, followed by di-(25%) and tri-CBs (24%) (Figure S2-1 PCBs in other urban and background sites of China, where triCBs dominated.…”

Influence of atmospheric circulation on the long-range transport of organochlorine pesticides to the western Tibetan Plateau

“…It was the unique source regions of Ngari comparing with the other regions in the Tibetan Plateau. Additionally, the climate of the northern Tibetan Plateau is mainly controlled by westerly wind, and westerly provided the high-level OCPs from the central Asia and even Russia (Cheng et al, 2007;Gai et al, 2014). The westerly also can reach the transition region in the non-monsoon period (Fig.…”

“…Due to the influence of Indian monsoon in the southeastern Tibetan Plateau, gaseous POPs showed peak concentrations in summer (Sheng et al, 2013). Based on observation of the seasonal pattern of atmospheric POPs, many studies have suggested that both the Indian monsoon Sheng et al, 2013;Xiao et al, 2010) and westerly wind (Cheng et al, 2007;Gai et al, 2014) are the main driving factors of POPs transport to the Tibetan Plateau. Wang et al (2010) reported that the western Tibetan Plateau may be influenced by both Indian monsoon and westerly wind.…”

Amount, Sources, and Dissolution of Aerosol Trace Elements in the Canadian Arctic

“…EF was calculated by dividing the TE to Ti ratio in aerosols to the TE to Ti ratio estimated for upper continental crust 54 (UCC; Table S8) using the formula (TE/ Ti) aerosol /(TE/Ti) UCC . Since Ti is widely associated with lithogenic materials, low EFs close to 1 indicate lithogenic [59][60][61][62][63][64][65][66][67][68][69]101,102 Pb isotope ratios of Arctic marine sediments 70,71 (gray crosses and field ellipse), Chinese dust 73 (blue crosses and field ellipse), and river particulates 72 from the North American Arctic (gray diamonds), Lena River (Russian Arctic; greed diamond), Chinese rivers (blue diamonds), and other Asian rivers (yellow diamonds) are also plotted, providing a reference for natural Pb components. The inset plot shows the complete aerosol Pb isotope data including GT 6, which had Pb isotopic ratios outside the range in the main figure.…”

“… 206 Pb/ 207 Pb vs 208 Pb/ 207 Pb of Arctic aerosols (black symbols) plotted together with possible Pb sources based on anthropogenic aerosols, lichens, and precipitations represented by crosses and field ellipsis from Canada (blue), United States (orange), Russia (green), Europe (red), and China (purple). − ,, Pb isotope ratios of Arctic marine sediments , (gray crosses and field ellipse), Chinese dust (blue crosses and field ellipse), and river particulates from the North American Arctic (gray diamonds), Lena River (Russian Arctic; greed diamond), Chinese rivers (blue diamonds), and other Asian rivers (yellow diamonds) are also plotted, providing a reference for natural Pb components. The inset plot shows the complete aerosol Pb isotope data including GT 6, which had Pb isotopic ratios outside the range in the main figure.…”