Where Does Valley Inversion Take Place Upsc?

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What is valley inversion?

Cold air at the hills and mountains, produced during the night, flows under the influence of gravity. Being heavy and dense, the cold air acts almost like water and moves down the slope to pile up deeply in pockets and valley bottoms with warm air above. This type of inversion of temperature is called valley inversion.

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Where do temperature inversions take place?

Temperature inversion is a meteorological phenomenon that develops when cool air is trapped at the ground under a layer of warm air. There are four types of temperature inversions: A ground inversion occurs most often on clear nights, when the air close to the ground is cooled by radiation.

Why a temperature inversion occurs in a valley at night?

A ground inversion develops when air is cooled by contact with a colder surface until it becomes cooler than the overlying atmosphere; this occurs most often on clear nights, when the ground cools off rapidly by radiation.

Why does temperature inversion happen in the troposphere?

The inversion created from a cold front is especially evident when a shallow layer of polar air moves into lower latitudes. The air associated with the shallow air mass is colder than the air aloft, thus creating an inversion. Inversions promote stability within the vertical layer of the troposphere they exist.

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What causes valley inversion?

Under normal weather conditions, the air temperature typically decreases with height. A classic example is when colder air settles into mountain valleys during times of stable, high-pressure weather conditions. Colder, more dense air pushes under the warmer, less dense air in the valley, which creates the inversion.

Why do inversions develop in valleys?

In valleys, inversions are also called cold-air pools and form as a result of both cooling of the ground due to long-wave radiation and nocturnal down-slope winds (Whiteman, 2000). They usually extend from the bottom of the valley up to the boundary-layer top.

In which two layers does temperature inversion occur?

Temperature inversion: It is a reversal of the normal behavior of temperature in the troposphere. Under this meteorological phenomenon a layer of warm air lies over the cold air layer. It is caused in stac atmospheric conditions while some times, it occurs due to horizontal or vertical movement of air.

Why does temperature inversion occur in polar regions?

This regular temperature inversion in the high Arctic is caused by the lack of surface heating by the Sun, which stays below the horizon during the winter (the Polar Night), and the continuous loss of heat from the surface (through emission of infrared radiation).

Are thermal inversions more likely in valleys or on hills?

Cold air is dense. It drains from higher elevations to lower elevations and hugs as close to the ground as possible. This makes valleys especially vulnerable to inversions in the winter.

What causes the inversion at stratosphere?

The thermal inversion in the stratosphere on Earth is due to absorption of ultraviolet radiation by Ozone (O3) but can be generated by other molecules on different planets. Above the stratosphere the temperature decreases with height due to cooling in the infrared, mainly by CO2.