earth science

Polar easterlies

Polar easterlies 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 Polar easterlies rather than just read about it. In short: In the study of Earth's atmosphere, polar easterlies are the dry, cold prevailing winds that blow around the high-pressure areas of the polar highs at the North and South poles. Cold air subsides at the poles creating high pressure zones, forcing an equatorward outflow of air; that outflow is then deflected westward by the Coriolis effect.

Key takeaways

Polar easterlies 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 Polar easterlies to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Polar easterlies from memory before moving on to harder problems.

Reference excerpt

In the study of Earth's atmosphere, polar easterlies are the dry, cold prevailing winds that blow around the high-pressure areas of the polar highs at the North and South poles. Cold air subsides at the poles creating high pressure zones, forcing an equatorward outflow of air; that outflow is then deflected westward by the Coriolis effect. Unlike the westerlies in the middle latitudes and trade winds in tropics, the polar easterlies are often weak and irregular. Note, winds are named based on where they came from. The polar easterlies are one of the five primary wind zones, known as wind belts, that make up our atmosphere's circulatory system. This particular belt of wind begins at approximately 60 degrees north and south latitude and reaches to the poles.

Worked examples

Example 1 — a first encounter with Polar easterlies

Start with the simplest possible case. Write down what Polar easterlies 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 Polar easterlies 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 Polar easterlies 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 Polar easterlies

In research: Polar easterlies 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 Polar easterlies 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: Polar easterlies is common in secondary-school and first-year university syllabi. It links to neighbouring topics Regional climate effects, Wind stubs, Winds, so understanding it makes those chapters shorter.
In everyday life: Look for Polar easterlies 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Polar easterlies” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Polar easterlies in 20 minutes

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

Frequently asked questions

What is Polar easterlies in simple terms?

Why does Polar easterlies 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 Polar easterlies?

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 Polar easterlies.