1899] Some Hydrograpliical Eesults. 5 



Mr. Hjort gives the following statemeiit (3, p. 26) in his survey 

 of hydrographical conditions in the spring herring district for the 

 month of December 1894: "While in October and November we 

 found 8^ C. at the depth of 100 m. and at a greater depth the 

 temperature of about 7, we now (December) find temperature at 

 250 m. to be 8 °". Consequently the annual variation of tempera- 

 ture on the west coast of Norway, even at the depth of 250 m., 

 may amount to at least 1° C. Measurements 1 undertook in the 

 Hjeltefjord near Bergen (1898) proved an annual variation af 1° C. 

 for the depth of 200 m. The change of temperature in one month 

 in the Hjeltefjord (200 m.) was already greater than the annual 

 variation for the innermost part of the Vestfjord (Lødingen). In 

 the "Norske Rende" off Stavanger Hjort and my seif measured 

 respectively: 



-'Ve 1895. 

 72 1896. 



58° 46' N. 

 40 35' E. 



d. 

 200 m. 



280 „ 



t. 

 6,0 C. 

 5,8 „. 



s. 

 35,35 

 35,35 



58 51,5' N. 

 40 57' E. 



200 „. 



6,5 „ 



35,15 



(Hjort). 



(Nordgaard). 



Similar differences of temperature were found on the other 

 coast sections tåken by Hjort and myself during the summer ot 

 1895 and the winter of 1896 respectively. There seems, however, 

 in the coast sea below 200 m. to prevail great stability, and Dr. 

 Hjort has consequently placed the region of periodical variations 

 in the coast sea at from to 200 — 250 m. In certain fjords the 

 variations at this bordering depth are smaller still. The best in- 

 stance is the Vestfjord, particularly the inner part of it. Among 

 all our fjords the latter is also the one that has been best in- 

 vestigated hydrographically, thanks to the great economical interest 

 cohnected to it. For measurements at Lødingen (69 ° 24' N., 

 16° 1' E.) I refer to Mohn (1, p. 91). The annual variation of 

 bottom temperature at the depth of 188 m. was only 0°,2 C, 

 temperature in that fjord deep being on the average 6^,4 C. In 

 that deep, which extends for some distance to the South of Lødingen 

 towards Tranø, and which I will shortly call the Tranø-deep, Mohn 

 measured with the Miller-Casella thermometer in July 1875 at 1^0 

 fathoms (188 m.) 60,2— 6^3 C; and the North Ocean Expedition 

 in June 1878 (1, p. 54, no. 255) measured at 183 m. 5°,9 and -fit 

 366—624 m. 60,4—60,5. 



18 



