Emissions from Chinese gasoline was the primary source of lead from 1974 to 2007 reaching the Tibetan plateau glaciated regions, while emissions from coal and ores were the primary sources after 2007, according to analysis of lead isotopes of ice cores from the Guliya ice cap, and Bayesian models.
- M. Roxana Sierra-Hernández
- Franco Marcantonio
- Lonnie G. Thompson