Kang Jung-Ho, Hwang Heejin, Han Changhee, Hur Soon Do, Kim Seong-Joong, Hong Sungmin
Division of Polar Paleoenvironment, Korea Polar Research Institute (KOPRI), 26 Songdomirae-ro, Incheon, 21990, Republic of Korea.
Division of Polar Paleoenvironment, Korea Polar Research Institute (KOPRI), 26 Songdomirae-ro, Incheon, 21990, Republic of Korea.
Chemosphere. 2017 Nov;187:294-301. doi: 10.1016/j.chemosphere.2017.08.101. Epub 2017 Aug 30.
We present high-resolution lead (Pb) concentrations and isotopic ratios from a northwest Greenland snow pit covering a six-year period between 2003 and 2009. Pb concentrations ranged widely from 2.7 pg g to 97.3 pg g, with a mean concentration of 21.6 pg g. These values are higher than those recorded for the pre-industrial period. Pb concentrations exhibit seasonal spikes in winter-spring layers. Crustal Pb enrichment factors (EF) suggest that the northwest Greenland snow pit is highly enriched with Pb of predominantly anthropogenic origin. The Pb/Pb ratios ranged from 1.144 to 1.169 with a mean value of 1.156, which fall between less radiogenic Eurasian-type and more radiogenic Canadian-type signatures. This result suggests that several potential source areas of Pb impact on northwest Greenland. Abrupt changes in Pb concentrations and Pb isotope ratios were observed and related to seasonal shifts in source regions of aerosol transport. The Pb/Pb isotope ratio increased gradually between 2003 and 2009. The similarity of the three-isotope plot (Pb/Pb versus Pb/Pb) between some of our samples and Chinese urban aerosols suggests a steadily increasing contribution of Chinese Pb to northwest Greenland snow.
我们展示了格陵兰岛西北部一个雪坑在2003年至2009年六年期间的高分辨率铅（Pb）浓度和同位素比值。铅浓度范围广泛，从2.7皮克/克到97.3皮克/克，平均浓度为21.6皮克/克。这些值高于工业化前时期记录的值。铅浓度在冬春层呈现季节性峰值。地壳铅富集因子（EF）表明，格陵兰岛西北部雪坑高度富集主要源自人为的铅。铅/铅比值范围为1.144至1.169，平均值为1.156，介于放射性较低的欧亚型和放射性较高的加拿大型特征之间。这一结果表明，有几个潜在的铅源区对格陵兰岛西北部产生影响。观察到铅浓度和铅同位素比值的突然变化，且与气溶胶传输源区的季节性变化有关。在2003年至2009年期间，铅/铅同位素比值逐渐增加。我们的一些样本与中国城市气溶胶之间的三同位素图（铅/铅与铅/铅）的相似性表明，中国铅对格陵兰岛西北部积雪的贡献在稳步增加。
