Fig. 1. Circulation pattern in the study area and ice extent in the Okhotsk Sea in February 2006 and February 2007. ESC is the Eastern Sakhalin Current, NWKC and CWKC are the northern
and central Western Kamchatka Currents, respectively. I — the Krusenstern Strait, II — the Fourth Kuril Strait. The meridional section across the Alaskan Stream and the section across the
Krusenstern and Fourth Kuril straits are shown.