The heat that incoming and outgoing ocean water absorbs from hot sand is negligible (this is one reason you can go to the beach during the summer and the sand will be burning hot but the water can be freezing cold). Water has a much higher heat capacity than sand, and thus takes much longer and much more energy to heat and cool. Most ocean water temperature changes result from currents, wind, and occasionally from days of high heat temperature exposure (such as weeks of sunshine and heat). This is also why even after weeks of high temperatures, the ocean can still be cold after just one deep water upwelling event.
Yes, absolutely. The sand transfers heat it absorbs from the sun into the water near the shoreline.
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