Anthropogenic Sulfate and Nitrate Signals inSnow from Bogda Glacier, Eastern Tianshan
- Received Date: 2018-07-15
- Rev Recd Date: 2018-07-15
- Publish Date: 2018-07-15
Abstract: A 1.2 m snow pit was recovered on July 29th, 2009 from the Bogda Glacier, eastern Tianshan (天山). The sample site temperature of -9.6 ℃ indicates that the unique glaciochemical record was well preserved and suitable for the reconstruction of air pollution levels in this previously unexplored region. Samples were analyzed for major ions (Na+, K+, Ca2+, Mg2+, NH4+, Cl-, SO42-, NO3-, HCOO-, and CH3COO-). NO3- and SO42- were characterized by significant high levels of pollution concentration. Most air masses backward trajectories ending in December 2008 have passed the Urumqi City center, while some even traveled across the primary nuclear weapons testing venue of the former Soviet Union (STS). The mean pH value of snow samples is coincident with the average value of Urumqi’s aerosol, and the ratio of [NO3-]/[SO42-] in the snow pit generally agrees with the value of the Urumqi winter aerosols...