Talk:Deep ocean water

Deep water temperature

• It is completely imposible for deep water to be at less the 3,8ºC, which is the temperature than ocean water reaches its maximum density and, therefore, its minimum volume. More than 3,8º C, water is less dense and remains on the ocean surface. And less of 3,8º C, ocean water is, also less dense and it remains also at the ocean surface. Salty water freezes at around -1,8º C. Conclusion: Deep ocean water ONLY can be at 3,8ºC. There are very good references explaining these facts. User:Fev —Preceding undated comment added 22:16, 6 February 2014 (UTC)

Almost 3 years from the above commentary without any answer. This gives me the reason to make changes in the page. Besides, the reference to the deep ocean temperature from the UCAR includes a graph which contradicts the idea of temperature between 0º and 3º C. --Fev 11:54, 27 December 2016 (UTC) — Preceding unsigned comment added by Fev (talk • contribs)

At the salinity of ocean water, the density anomaly has vanished. The density anomaly is at about 3,8°C for salt-free freshwater only. Your comment would be absolutely correct for lakes. At higher salinity, the anomaly decreases in temperature and, for ocean-water salinity, has decreased below freezing point. Deep Ocean Water is typically at 0-3°C, and in some areas even below 0°C (the freezing point is also reduced). --129.13.156.135 (talk) 13:38, 10 January 2017 (UTC)

Energy source?

The idea of using the energy difference between deep cold water and ambient temperature at the surface sounds fairly implausible to me, though I'm no physicist. Is such a system likely to produce enough energy to outweigh the energy cost of pumping water up from the deep ocean? Myopic Bookworm (talk) 19:19, 8 August 2018 (UTC)

The relevant article is ocean thermal energy conversion. As to whether this is, or might ever be, really practical - that's something you should ask at Wikipedia:Reference desk/Science. -- Finlay McWalter··–·Talk 19:27, 8 August 2018 (UTC)