Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2009. Issue.6. Vol.1. P. 429-441
Some regularities of the forming of extremely low-ice winters in
the Okhotsk Sea
Л.С. Муктепавел
, Т.А. Шатилина
Тихоокеанский научно-исследовательский рыбохозяйственный центр
(ТИНРО-Центр), 690950, Владивосток, пер. Шевченко, 4
Years of extremely low-ice conditions in Okhotsk Sea (1991, 1996, 1997, 2006) were determined by
remote sensing. The reason for studying such infrequent anomalous processes, accounting for 8% from
1957-2006, is presented for scientific and practical interest.Large-scale processes above the second
naturally synoptical region of the Northern Hemisphere (30°-70°N., 80°-160°E) were studied. It is shown
that in 1991, 1996, 1997 and 2006, a cold centre in the troposphere over the Okhotsk Sea had large
positive anomalies of 500 hPa geopotential (centres of the heat). Such a situation formed as a result of
frequent intrusions of a Pacific tropospheric ridge on most areas of the sea. The anomalous circulation in
the troposphere of the second naturally synoptical region prompted a change in the trajectory of surface
cyclones forming a cyclogenesis over the Okhotsk Sea. The trailing part of the cyclones, displaced over
the Okhotsk Sea, caused the transportation of warm air and increased warm ocean water advection
through the Kuril straits. Air temperature in the central part of the Okhotsk Sea was observed to be above
8°C for the indicated years.
Keywords: Okhotsk Sea, 500 hPa geopotential, extremely low-ice conditions, Pacific tropospheric ridge
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