PHYSICAL OCEANOGEAPHY OF THE GULF OF MAINE 



551 



In 1920 the entire surface of the open gulf ranged between 3° and 4° by April 9 

 to 20, including the eastern part of Georges Bank, the Eastern Channel, and Browns 

 Bank; except for one station on PlattsBank (20094), where active vertical circulation 

 caused a fractionally lower surface reading (2.78°), and off the Kennebec River 

 (station 20096, 2.78°), where a very low surface salinity (29.94 permille, p. 1001) was 



Temperature, Centigrade 



Fig. 23.— Vertical distribution of temperature near the Isles of Slioals and Boone Island at suc- 

 cessive dates of the year 1913, to show the progress of vernal wanning. A, March 29, 1913; 

 B, April 6 (both near Boone Island); C, April 13; D, April 16; E, April 29; F, May 8; G, 

 May 14 (C and F are near the Isles of Shoals) 



unmistakable evidence of freshet water. In 1925 the surface of the coastal belt 

 (Cape Ann to Mount Desert) was about 1 degree warmer at this season {Halcyon 

 records, p. 1012), grading (south to north) from 5.5° to 2.5°-3.8°, though with the 

 water to the eastward of Cape Elizabeth still continuing coldest next the land." 



II Close in to Boothbay 3.3°, but 4.4° near Seguin Island; 1.9° in Southwest Harbor, but 3 to 3.S° near Duck Island, off Mount 

 Desert Island. 



