B Why is sea surface water relatively constant?

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Sea surface water remains relatively constant due to the balance between solar energy absorption and evaporation, which cools the water and maintains temperature stability. The evaporation process also increases salt concentration, leading to denser water that sinks and contributes to deep ocean currents. This dynamic creates a system that seeks equilibrium, aided by the ocean's large thermal reservoir. Additionally, evaporation can impact sea level, as it causes a drop when water is removed from the ocean. Understanding these processes is crucial for studying oceanography and the effects of climate on marine environments.
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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