. The Bell System technical journal . c-tuation on Profile 3 is probably due to variations with time. At a certain depth, often about 1,200 meters, a sharp change in tem-perature takes place. An interface known as the main thermoclineseparates the warm surface waters from the cold (2°-4°C) deep boundary shifts slightly from time to time and is affected by sub-surface (internal) tidal waves. Thus, cable laid near the main thermo-cline may undergo temperature changes of a few degrees. These changesmay be of different periods depending on their causes, , subsurfacewaves, seasonal c
. The Bell System technical journal . c-tuation on Profile 3 is probably due to variations with time. At a certain depth, often about 1,200 meters, a sharp change in tem-perature takes place. An interface known as the main thermoclineseparates the warm surface waters from the cold (2°-4°C) deep boundary shifts slightly from time to time and is affected by sub-surface (internal) tidal waves. Thus, cable laid near the main thermo-cline may undergo temperature changes of a few degrees. These changesmay be of different periods depending on their causes, , subsurfacewaves, seasonal changes, or long term changes in ocean regime. It is notknown if a long-term change in depth of the thermocline has occurredbut such change seems probable. The greatest percentage of any transatlantic cable route lies in depths! greater than 2,000 meters and thus the temperature changes in theI deep sea are of primary importance to the engineering of a cable. TheI temperatures are low, averaging 3°C, and the temperature changes are. Fig. 19 — Positions of Temperature Profiles 1, 2, and 3. oo zo a LU o< X 5 o
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