. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 228 GEORGE L. CLARKE HYDROGRAPHY The coastal area is distinguished from the areas farther offshore first of all by the great and important difference in the depth of the water. At Station 1 the water averaged 44 meters deep, at Station 2(A), it averaged 69 meters, and at Station 3 it averaged 85 meters. Station 4 was located just at the brink of the continental slope and the slightly different positions reached on different cruises resulted in depths which varied from 159 meters to 375 meters. The depth in the slope water ar
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 228 GEORGE L. CLARKE HYDROGRAPHY The coastal area is distinguished from the areas farther offshore first of all by the great and important difference in the depth of the water. At Station 1 the water averaged 44 meters deep, at Station 2(A), it averaged 69 meters, and at Station 3 it averaged 85 meters. Station 4 was located just at the brink of the continental slope and the slightly different positions reached on different cruises resulted in depths which varied from 159 meters to 375 meters. The depth in the slope water area was very much greater. At Station 5, located over the steep section of the continental slope, the depth varied from 411 meters to 1,134 meters and at the other stations in this area the water was from 2,000 to 3,000 meters deep. The depth at Station 9(C) in the Sargasso Sea averaged 5,100 meters. TEMPERATURE IN °C 12 13 14 15 16 17 18 19 20 21 22 23 24. FIG. 2. Coastal Water—Seasonal changes in the distribution of temperature with depth at Station 2(A). The currents in the areas under consideration are generally parallel to the coast in their broader aspect. In the coastal zone a slow and intermittent movement of the water down the coast in a southwesterly direction has been detected supplying Stations 1 to 4 with cooler and less saline water than exists offshore. In contrast, the western part of the Sargasso water, , the Gulf Stream, is flowing rapidly in the op- posite direction, and at Station 9(C) the highest temperatures and salinities were encountered. The slope water is an area of mixing in which intermediate conditions are to be expected. For a complete analysis of the hydrographic situation reference should be made to Iselin (1940). A synopsis of the conditions from the biological view- point follows. At Station 2(A), which we may take as typical of the coastal region, the water is found to be completely mixed early in the winter with the result that the temp
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