*Ekaterina Dmitrievna Pavlyukevich^1,2、Nelly Eduardovna Elagina³、Inna Nikolayevna Krylenko^1,2、Ekaterina Petrovna Rets²、Abror Asrorjonovich Gafurov⁴、Yuri Georgievich Motovilov² (1.Lomonosov Moscow State University, Moscow, Russia、2.Water Problems Institute of the Russian Academy of Sciences, Moscow, Russia、3.Institute of Geography of the Russian Academy of Sciences, Moscow, Russia、4.German Research Centre for Geoscience, Potsdam, Germany)