PHYSICAL OCEANOGRAPHY OF THE GULF OF MAINE 
611 
the north and west, so that a line run south from Mount Desert Island would alter- 
nately cross a warm tongue and then cooler water at 100 meters, just as at 40 meters 
(p. 608). 
This regional distribution of temperature is precisely the opposite of the surface 
state (fig. 46), where the gulf is warmest in the west and coolest in the northeast, a 
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Fig. 55.— Temperature at a depth of 100 meters, August, 1912 (above), and August, 1913 (below) 
difference discussed in a later chapter (p. 924). In August, 1912 and 1913, this 
warmest zone at 100 meters extended westward along the coast of Maine as far as 
longitude 69° 30'. In 1914 it hardly passed the mouth of Penobscot Bay. In all 
three years — 1913 to 1915 — the 100-meter temperature was 3° to 4° higher along the 
eastern slope of the basin (8° to 8.6°) than in the opposite side of the gulf. 
