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Rock Street, San Francisco

The water’s specific heat capacity is higher than that of the sand. Their
difference of specific heat capacity affects the sea and land breezes. Sea and Land Breezes describe the wind that blows
onshore from sea to land during the day and blows offshore in the evening.In this picture, at daytime, the
sun heats up both the ocean surface and the land. Water is a good absorber of
the energy from the sun. The land absorbs much of the sun’s energy as
well.  However, water heats up much more slowly than land and so the air
above the land will be warmer compared to the air over the ocean as the
sea has a higher specific heat, its temperature rise is less than that of the
land. The warm air over the land will rise throughout
the day, causing low pressure at the surface. Over the water, high surface
pressure will form because of the colder air. To compensate, the air will sink
over the ocean. The wind will blow from the higher pressure over the water to
lower pressure over the land causing the sea breeze for the cooler the
air, higher its density and hence higher the pressure,
thus during the day, air flows from the high pressure region over sea to the
low pressure region over land.. The sea breeze
strength will vary depending on the temperature difference between the land and
the ocean.During the day, the land heats up and become
very hot to walk on. At night, however, the land has given up the added heat
and is cool to the touch. The ocean, however, is able to hold onto this heat
after the sun sets and not lose it as easily thus we can say that the land
loses heat faster than water. This
time the sea is at a comparatively higher temperature and
causes the low surface pressure to shift to move over the ocean during the
night and the high surface pressure to move over the land. Air now flows
from the land (high pressure) to the sea (low pressure). This causes a small temperature gradient between the ocean
surface and the nearby land at night and the wind will blow from the land to
the ocean creating the land breeze.            An
example to this is when you fill water in a 50 mL beaker and fill another 50 mL
beaker with sand and then put them into a hotplate for 10 minutes with a
temperature of 100oC. You can observe that the sand heats up faster
than the water. That is the why the water in the beach is cold even when the
sand in the seashore is already hot or warm. However, if you take the beakers
from the hotplates and allow them to cool down, you could observe that the sand
cools faster than the water. That is why people like to go night swimming
because the water is warm even when the land is cold. 

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