1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2. School of Geography & Environmental Science, Guizhou Normal University, Guiyang 550025, China
3. Center for Advances in Water and Air Quality, Lamar University, Beaumont, Texas 77710, United States
4. Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xian 710061, China