. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 276 BIOLOGY OF THE SEAS OF THE ,. Fig. 117. Ice chart of the Baltic Sea (Bliitgen, 1938). 1 Fast ice; 2 Periodical drift pack ice; 3 Periodical floes; 4 Periodical drift ice; 5 Episodical fast ice; 6 Episodical pack ice; 7 Episodical drift ice. of their surface: in the inner parts for 2 to 5 months and more, at the inner end of the Gulf of Finland for 3 to 6 months and at the top of the Gulf of Bothnia for as much as 5 to 7 months. The ice conditions of the Baltic Sea are shown in Fig. 117.
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 276 BIOLOGY OF THE SEAS OF THE ,. Fig. 117. Ice chart of the Baltic Sea (Bliitgen, 1938). 1 Fast ice; 2 Periodical drift pack ice; 3 Periodical floes; 4 Periodical drift ice; 5 Episodical fast ice; 6 Episodical pack ice; 7 Episodical drift ice. of their surface: in the inner parts for 2 to 5 months and more, at the inner end of the Gulf of Finland for 3 to 6 months and at the top of the Gulf of Bothnia for as much as 5 to 7 months. The ice conditions of the Baltic Sea are shown in Fig. 117. Such temperatures are unknown in the North Sea, which lies alongside the Baltic and in the same latitude (Fig. 118). During the warmest time of the year (August) the surface temperatures of both Seas are practically the same. The heat conditions of the deepest parts of the sea undergo slight variations in temperature in the course of the year. Below 50 m and down to the bottom. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zenkevich, L. A. (Lev Aleksandrovich), 1889-1970. New York, Interscience Publishers
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