Biogeochemistry of organic carbon, CO2, CH4, and trace elements in thermokarst water bodies in discontinuous permafrost zones of Western Siberia - Pokrovsky, Oleg S.; Kirpotin, Sergey N.; Desmukh, C.; Pokrovsky, B. G.; Audry, Stephane; Viers, Jerome; Shirokova, Liudmila S. (Biogeochemistry, 2013)