earth science

Subtropical Countercurrent

Subtropical Countercurrent 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 Subtropical Countercurrent rather than just read about it. In short: The subtropical countercurrent (STCC) is a narrow eastward ocean current in the central North Pacific Ocean (20–30°N) where the Sverdrup theory predicts a broad westward flow. It originates in the western North Pacific around 20°N, and flows eastward against the northeast trade winds and stretches northeastward to the north of Hawaii.

Key takeaways

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

Reference excerpt

The subtropical countercurrent (STCC) is a narrow eastward ocean current in the central North Pacific Ocean (20–30°N) where the Sverdrup theory predicts a broad westward flow. It originates in the western North Pacific around 20°N, and flows eastward against the northeast trade winds and stretches northeastward to the north of Hawaii. It is accompanied by a subsurface temperature and density front called the subtropical front, in thermal wind relation with the STCC. Furthermore, the STCC maintains a sea surface temperature front during winter and spring. During April and May when the SST front is still strong, the seasonal warming makes the region conductive to atmospheric convection, and surface wind stress curls turn weakly positive along the front on the background of negative curls that drive the subtropical gyre. On the weather timescale, positive wind curls are related to low-pressure systems of a subsynoptic scale in space, energized by surface baroclinicity and latent heat release along the STF front. The SST front also anchors a meridional maximum in column-integrated water vapor, indicating a deep structure of the atmosphere response.

References Xu, Lixiao; Xie, Shang-Ping; Liu, Qinyu; Kobashi, Fumaiki (May 2012). "Response of the North Pacific Subtropical Countercurrent and its Variability to Global Warming" (PDF). Journal of Oceanography. 68 (1): 127–137. doi:10.1007/s10872-011-0031-6. Retrieved April 19, 2017.

Worked examples

Example 1 — a first encounter with Subtropical Countercurrent

Start with the simplest possible case. Write down what Subtropical Countercurrent 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 Subtropical Countercurrent 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 Subtropical Countercurrent 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 Subtropical Countercurrent

In research: Subtropical Countercurrent 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 Subtropical Countercurrent 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: Subtropical Countercurrent is common in secondary-school and first-year university syllabi. It links to neighbouring topics Currents of the Pacific Ocean, Marine geography stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Subtropical Countercurrent 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 Subtropical Countercurrent in 20 minutes

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

Frequently asked questions

What is Subtropical Countercurrent in simple terms?

Why does Subtropical Countercurrent 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 Subtropical Countercurrent?

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 Subtropical Countercurrent.