Direction of Wind and Sea Land Breeze

Sea-land breeze is a diurnal local wind that occurs in offshore and coastal areas. Land and sea winds are caused by the temperature difference between land and sea during the alternation of day and night. That is, the temperature over the sea is lower than the land during the day and higher than the land at night. The temperature difference brings about the density and pressure difference of the near-surface atmosphere, and the pressure gradient force pushes the air flow from regions of high pressure (low temperature) to regions of low pressure (high temperature).

At night (winter), the situation is reversed, with low-level winds blowing from the continent to the ocean, known as land winds. In mountainous areas, due to thermal reasons, the valley blows to the plain or hillside in the daytime, and the plain or hillside blows to the night. The former is called valley wind, and the latter is called mountain wind.

This is due to the fact that during the day the mountain slopes are heated faster and the temperature is higher than that of the air at the same height above the valley, and the warm air on the slopes flows from the mountain slopes to the upper valley. The air in the valley replenishes the lost air up the hillside, and the wind that blows from the valley to the hillside is called the valley wind. At night, hillside due to radiation cooling, its cooling rate is faster than the same height of the air, cold air along the slope down into the valley, called mountain wind.

Wind turbine sea-land breeze

Wind turbine is a machine that converts wind energy into electric energy. The blades of wind turbine rotates 13 to 20 revolutions per minute, depending on their technology, at a constant or variable speed, in which the speed of the rotor changes relative to the wind speed to achieve higher efficiency.

When solar radiation passes through the earth's atmosphere, the atmosphere absorbs about 2 x 1016W of energy, a small part of which is converted into the kinetic energy of the air. Because the tropics absorb more of the sun’s radiation, the atmospheric pressure difference leads to air flow and wind.

As for local areas, For example, in high mountains and deep valleys, during the day, the air at the top of the mountains, heated by the sun, rises, and in the deep valleys, cold air takes its place. Therefore, the wind blows from the valley to the mountain; At night, the high mountain air cools faster, so the wind blows from the mountain to the deep valley. Another example, such as in coastal areas, due to the temperature difference between land and sea during the day, the formation of sea breeze blowing toward the land; Instead, it blows from land to sea at night.

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