A textbook of oceanography by Jenkins J. Travis (James Travis) b. 1876

Author:Jenkins, J. Travis (James Travis), b. 1876
Language: eng
Format: epub
Tags: Oceanography
Publisher: London, Constable
Published: 1921-01-30T05:00:00+00:00

SALINITY

103

may be satisfactory, there is nevertheless a change of temperature, due to the diminution of pressure on the enclosed watfr. This change of temperature is inappreciable in shallow water. But in greater depths the release of pressure which takes place during the hauling in lowers the temperature of the enclosed

FIG. 16.— THE PETTERSSOX-NAXSEX WATER-BOTTLE.

sample. For that reason the thermometer inside the water-bottle is not relied upon absolutely, but is compared with the outside reading given by the inverted Richter thermometer.

Surface Salinities.

The Atlantic Ocean has the highest surface salinities. These attain in the North Atlantic a maximum of over 37 per mille from the Canary Islands to 55° W. Long., and on both sides of the Tropic of Cancer from 17° to 30° N. Lat. the

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