High School Why is sea surface water relatively constant?

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SUMMARY

The discussion centers on the relative constancy of sea surface water temperature and salinity, attributed to the significant role of solar energy in water evaporation. The author of the referenced book explains that nearly all solar energy is utilized for evaporation, which cools the water and maintains thermal equilibrium. This process also leads to increased salt concentration, resulting in denser water that sinks and contributes to deep ocean currents. The author and book title were not specified in the discussion.

PREREQUISITES
  • Understanding of oceanographic principles, particularly heat transfer and evaporation.
  • Familiarity with the concept of thermal equilibrium in large bodies of water.
  • Knowledge of salinity and its effects on water density and ocean currents.
  • Basic comprehension of the halocline and its geological implications.
NEXT STEPS
  • Research the role of solar energy in ocean evaporation and its impact on temperature regulation.
  • Study the dynamics of ocean currents, focusing on density-driven flow and the halocline effect.
  • Examine the relationship between evaporation, salinity, and sea level changes.
  • Explore the geological formations influenced by halocline-driven currents, including deep seafloor valleys.
USEFUL FOR

Oceanographers, environmental scientists, and anyone interested in the dynamics of ocean temperature and salinity, as well as the geological effects of ocean currents.

jaumzaum
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I'm studying oceanography and the author of the book that I'm currently reading stated that sea surface water is relatively constant during the day, changing very slowly during the year. He says "this is because almost all the energy received from the sun is used in the evaporation of water".

I don't fully understand the reasoning of the author, can anyone explain this reasoning for me better?
 
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What's the full quote? Constant what? Temperature? It's because evaporation cools the water, which balances out the heat gain from the sun. Obviously this system would have to seek equilibrium and it would also have a very large thermal reservoir to resist changes.
 
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It's best to give us the name of the author and the book. Is he talking about sea level? If water evaporates from the oceans, sea level will drop.
 
jaumzaum said:
He says "this is because almost all the energy received from the sun is used in the evaporation of water".
Evaporation of water from the sea surface, results in an increasing salt concentration. That makes the remaining water more dense, so it sinks and flows away as a deep current, while lower density wave-mixed seawater flows in on the surface.
https://en.wikipedia.org/wiki/Halocline

Erosion by halocline-driven currents, adjacent to shallow seas, have formed some deep seafloor valleys. There is a 120 km long example here; Google Earth -38.680°, 149.173°.
 
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In sci-fi when an author is talking about space travellers or describing the movement of galaxies they will say something like “movement in space only means anything in relation to another object”. Examples of this would be, a space ship moving away from earth at 100 km/s, or 2 galaxies moving towards each other at one light year per century. I think it would make it easier to describe movement in space if we had three axis that we all agree on and we used 0 km/s relative to the speed of...

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