What is the meaning of extratropical cyclone?

Temperate cyclone refers to the atmospheric circulation system formed and developed in temperate regions, usually accompanied by strong winds, precipitation and weather changes.

Temperate cyclone is an atmospheric circulation system formed and developed in temperate regions. Their formation is related to temperature difference and pressure gradient, and they have the characteristics of low pressure center, rotating airflow, cloud system and precipitation.

Temperate cyclone has an important influence on weather and climate, which can cause extreme weather and natural disasters and regulate climate change and seasonal change. Understanding the significance and characteristics of extratropical cyclones will help us better understand and deal with related weather and climate phenomena.

1, formed by:

The extratropical cyclone, also known as "extratropical depression" or "frontal cyclone", is an elliptical baroclinic cyclone, which is active in the temperate middle and high latitudes. Temperate cyclone activities are often accompanied by the invasion of cold air, followed by weather phenomena such as cooling, sandstorm, snowfall, frost, strong wind and heavy rain.

Structurally speaking, the extratropical cyclone is a cold center system, that is, the central pressure of the extratropical cyclone is lower than that around it, which has the nature of a cold center. In terms of scale, temperate cyclones are generally larger than tropical cyclones, ranging in diameter from several hundred kilometers to 3,000 kilometers, with an average diameter of 1000 kilometers.

The formation of extratropical cyclone is related to temperature difference and pressure gradient. In temperate regions, due to the influence of the earth's rotation and latitude, the amount of solar radiation received at different latitudes is different, resulting in temperature difference. This temperature difference leads to the vertical movement and horizontal transportation of air, and then forms an extratropical cyclone.

2. Features:

The characteristics of extratropical cyclones include: low pressure center, rotating airflow, cloud system and precipitation. Around the low pressure center of temperate cyclone, the air will rotate counterclockwise (in the northern hemisphere), forming a spiral airflow. At the same time, wet air rises and cools, forming cloud system and precipitation phenomenon.

3. Impact:

Temperate cyclones have an important influence on weather and climate. They will bring extreme weather phenomena such as strong winds, heavy rains and blizzards, and cause natural disasters such as floods and blizzards. In addition, extratropical cyclones can also affect climate change and seasonal change, and play a regulatory role in precipitation distribution and temperature change.