aShirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia
bAtlantic Department, Shirshov Institute of Oceanology, Russian Academy of Sciences, Kaliningrad, Russia
cGeological Institute, Russian Academy of Sciences, Moscow, Russia
Correspondence to: *e-mail: e_v_ivanova@ocean.ru
Received 6 November, 2015
DOI: 10.1134/S0001437016040044