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Subsidence (atmosphere)

Subsidence (atmosphere) is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Subsidence (atmosphere) rather than just read about it. In short: In meteorology, subsidence is the downward movement of an air parcel as it cools and becomes denser. By contrast, warm air becomes less dense and moves upwards (atmospheric convection).

Subsidence (atmosphere) — main illustration
Subsidence (atmosphere) — illustration

Key takeaways

  • Subsidence (atmosphere) belongs to earth science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Subsidence (atmosphere) to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Subsidence (atmosphere) from memory before moving on to harder problems.

Reference excerpt

In meteorology, subsidence is the downward movement of an air parcel as it cools and becomes denser. By contrast, warm air becomes less dense and moves upwards (atmospheric convection). Atmospheric subsidence generally creates a high-pressure area as more air moves into the same space: the polar highs are areas of almost constant subsidence, as are the horse latitudes, and the areas of subsidence are the sources of much of the prevailing winds in the Earth's atmosphere. Subsidence also causes many smaller-scale weather phenomena, such as morning fog; on the other hand, its absence may cause air stagnation. An extreme form of subsidence is a downburst, which can result in damage similar to that produced by a tornado. A milder form of subsidence is referred to as downdraft.

Atmospheric pressure and atmospheric subsidence The Dosen barometer (pictured) clearly relates high pressure with fine weather, as seen in its dial. This is because high pressure zones are subsidence zones, with dry and cool air descending and, therefore, clear skies and good weather.

See also Diathermancy Convection

References

Illustrations

Subsidence (atmosphere): Subsidence above the Congo River Basin including the Congo River and some tributaries. Note the lack of clouds above the rivers due to subsidence of colder air which precludes convection, convection being the inverse process to subsidence. Source: NASA [1]
Subsidence above the Congo River Basin including the Congo River and some tributaries. Note the lack of clouds above the rivers due to subsidence of colder air which precludes convection, convection being the inverse process to subsidence. Source: NASA [1]
Subsidence (atmosphere): Dosen barometer showing different kinds of weather, according to atmospheric pressure, being high pressure an indication of fair weather because of atmospheric subsidence, and being rapidly diminishing pressure, a sign to a bad weather system approaching.
Dosen barometer showing different kinds of weather, according to atmospheric pressure, being high pressure an indication of fair weather because of atmospheric subsidence, and being rapidly diminishing pressure, a sign to a bad weather system approaching.

Worked examples

Example 1 — a first encounter with Subsidence (atmosphere)

Start with the simplest possible case. Write down what Subsidence (atmosphere) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Subsidence (atmosphere) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Subsidence (atmosphere) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Subsidence (atmosphere)

In research
Subsidence (atmosphere) appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Subsidence (atmosphere) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Subsidence (atmosphere) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Atmosphere, Meteorological phenomena, Meteorology stubs, so understanding it makes those chapters shorter.
In everyday life
Look for Subsidence (atmosphere) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Subsidence (atmosphere) in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Subsidence (atmosphere) means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Subsidence (atmosphere) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Subsidence (atmosphere) in simple terms?

In meteorology, subsidence is the downward movement of an air parcel as it cools and becomes denser. By contrast, warm air becomes less dense and moves upwards (atmospheric convection).

Why does Subsidence (atmosphere) matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Subsidence (atmosphere)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Subsidence (atmosphere).

Tags

  • Atmosphere
  • Meteorological phenomena
  • Meteorology stubs

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