Temperature is the most obvious one I can thing of, but there must be loads.
The surface water temperatures of the oceans change from season to season. But the ocean in general in the last 30-50 years has warmed to approximately 0.1 ° F, this represents a significant change. The ocean due to its large size has a high heat capacity.
Ocean water temperature varies significantly with location and season, being warmest near the equator and colder at the poles. Seasonal fluctuations are more pronounced in mid-latitude regions compared to tropical or polar areas. Ocean currents further influence these temperatures, redistributing heat and impacting marine climates.
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