earth science

L'Atalante basin

L'Atalante basin 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 L'Atalante basin rather than just read about it. In short: L'Atalante basin is a hypersaline brine lake at the bottom of the Mediterranean Sea about 192 km (119 mi) west of the island of Crete. It is named for the French L'Atalante, one of the oceanographic research vessels involved in its discovery in 1993.

Key takeaways

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

Reference excerpt

L'Atalante basin is a hypersaline brine lake at the bottom of the Mediterranean Sea about 192 km (119 mi) west of the island of Crete. It is named for the French L'Atalante, one of the oceanographic research vessels involved in its discovery in 1993. L'Atalante and its neighbors the Urania and Discovery deep hyper saline anoxic basins (DHABs) are at most 35,000 years old. They were formed by Messinian evaporite salt deposits dissolving out of the Mediterranean Ridge and collecting in abyssal depressions about 3,000 m (9,800 ft) deep. L'Atalante is the smallest of the three; its surface begins at about 3,500 m (11,500 ft) below sea level.

Description and biology The L'Atalante basin's salinity is near saturation at 365 g⁄L (about 8 times that of ordinary seawater), which prevents it from mixing with the oxygenated waters above; therefore, it is completely anoxic. The approximately 1.5 m (5 ft) halocline between the seawater above and brine below teems with bacterial and archaeal cells: they are chemoautotrophs, which feed on ammonia from the brine but cannot function without some oxygen. Members of archaeal anaerobic methane oxidizers group 1 (ANME-1) and haloarchaea are found only in the halocline zone. No group of organisms manages to prosper in all three zones. In the brine, there are fewer cells; extremophiles predominate, including members of the deep-sea hydrothermal vent euryarchaeota (DHVEs), Methanohalophilus and Pseudomonadota (formerly Proteobacteria). Eukaryotes are also found in l'Atalante, including ciliates (45%), dinoflagellates (21%) and choanoflagellates (10%). The dark gray anoxic sediments at the bottom of L'Atalante lake are covered with a 1 cm (0.4 in) loose black layer. Microbes found in the sediments are almost all (90%) various species of Bacillus. In 2010, three metazoan species, all in the Loricifera phylum, were discovered living in the sediment, the first multicellular lifeforms known to live entirely without oxygen.

References

External links Stephen Ornes: Animals without oxygen, underwater, ScienceNews for Students, 27 Apr 2010

Worked examples

Example 1 — a first encounter with L'Atalante basin

Start with the simplest possible case. Write down what L'Atalante basin 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 L'Atalante basin 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 L'Atalante basin 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 L'Atalante basin

In research: L'Atalante basin 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 L'Atalante basin 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: L'Atalante basin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anoxic waters, Mediterranean Sea, Oceanic basins of the Atlantic Ocean, so understanding it makes those chapters shorter.
In everyday life: Look for L'Atalante basin 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 L'Atalante basin in 20 minutes

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

Frequently asked questions

What is L'Atalante basin in simple terms?

Why does L'Atalante basin 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 L'Atalante basin?

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 L'Atalante basin.