[1] NIOZ Royal Netherlands Inst Sea Res, Dept Marine Organ Biogeochem, POB 59, NL-1790 AB Den Burg, Texel, Netherlands
[2] Russian Acad Sci, Minist Nat Resources, All Russian Res Inst Geol & Mineral Resources Wor, St Petersburg 196140, Russia
[3] Russian Acad Sci, Limnol Inst, Siberian Branch, Irkutsk 664003, Russia
[4] Moscow MV Lomonosov State Univ, Dept Geog, Moscow, Russia
[5] Russian Acad Sci, Earth Cryosphere Inst, Siberian Branch, Tumen, Russia