science

Wave cloud

Wave cloud is a 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 Wave cloud rather than just read about it. In short: A wave cloud is a cloud form created by atmospheric internal waves. Formation The atmospheric internal waves that form wave clouds are created as stable air flows over a raised land feature such as a mountain range, and can form either directly above or in the lee of the feature.

Key takeaways

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

Reference excerpt

A wave cloud is a cloud form created by atmospheric internal waves.

Formation The atmospheric internal waves that form wave clouds are created as stable air flows over a raised land feature such as a mountain range, and can form either directly above or in the lee of the feature. As an air mass travels through the wave, it undergoes repeated uplift and descent. If there is enough moisture in the atmosphere, clouds will form at the cooled crests of these waves. In the descending part of the wave, those clouds will evaporate due to adiabatic heating, leading to the characteristic clouded and clear bands. The cloud base on the leeward side is higher than on the windward side, because precipitation on the windward side removes water from the air. It is possible that simple convection from mountain summits can also form wave clouds. This occurs as the convection forces a wave or lenticular wave cloud into the more stable air above.

Importance

Climate modelling Wave clouds are typically mid- to upper-tropospheric ice clouds. They are relatively easy to study, because they are quite consistent. As a result, they are being analyzed to increase our understanding of how these upper-level ice clouds influence the Earth's radiation budget. Understanding this can improve climate models.

Recreation The streamlines in these clouds have the steepest slope a few kilometers downwind of the lee slope of a mountain. It is in these regions of highest vertical velocity that sailplanes can reach record-breaking altitudes.

Structure In an ideal model, a wave cloud consists of supercooled liquid water at the lower part, a mixed phase of frozen and liquid water near the ridge, and ice beginning slightly below the ridge and extending downstream. However, this doesn't always occur. Wave cloud structure ranges from smooth and simple, to jumbled phases occurring randomly. Often, ice crystals can be found downwind of the waves. Whether this happens depends on the saturation of the air. The composition of the ice is currently an active topic of study. The main mechanism for ice formation is homogeneous nucleation. The ice crystals are mostly small spheroidal and irregular-shaped particles. Ice columns make up less than 1%, and plates are virtually nonexistent. Multi-level mountain wave clouds form when the moisture in the air above the mountain is located in distinct layers, and vertical mixing is inhibited.

See also Lee waves Orographic lift Horizontal convective rolls

References

Illustrations

Worked examples

Example 1 — a first encounter with Wave cloud

Start with the simplest possible case. Write down what Wave cloud claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 Wave cloud 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 Wave cloud 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 Wave cloud

In research: Wave cloud appears in 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 Wave cloud 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: Wave cloud is common in secondary-school and first-year university syllabi. It links to neighbouring topics Atmospheric dynamics, Cloud types, Cumulus, so understanding it makes those chapters shorter.
In everyday life: Look for Wave cloud 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 Wave cloud in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Wave cloud 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 Wave cloud out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Wave cloud in simple terms?

A wave cloud is a cloud form created by atmospheric internal waves. Formation The atmospheric internal waves that form wave clouds are created as stable air flows over a raised land feature such as a mountain range, and can form either directly above or in the lee of the feature.

Why does Wave cloud matter?

Because it connects several 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 Wave cloud?

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 Wave cloud.