Geophysics physics.geo-ph

In 1998, the planet's thermometer set a record that still stands. Global temperature spiked and then leveled off, even as CO2 emissions kept rising.

The Paraná River behaves like a seismograph that records not the shaking of the ground but the pulse of the Sun. A century of daily water-level measurements at the gauging station in the city of Corrientes, 900 kilometers from the river's mouth, shows that when the Sun has many sunspots, the river floods more. This connection is neither accidental nor weak.

A forest fire has no "typical" size: a small grass burn and a firestorm covering thousands of hectares are part of the same phenomenon. The same goes for tropical cyclones: the energy they release over their lifetime does not cluster around some average value. Instead, it follows a power law, and this rule holds across all of Earth's oceans.

A swing builds up when you push it in time. But sometimes the person on the swing responds not to every push but to every third one, and the amplitude grows slowly yet inexorably.

In 2008, drought hung over South America. Rivers shrank, pastures yellowed, and farmers stared at the sky waiting for rain that never came. Meanwhile, 450 kilometers above, two satellites flying 220 kilometers apart continued their invisible work: they were weighing the continent.

Every spring in Alaska, residents of the town of Nenana gather by the frozen Tanana River. They've bought lottery tickets, each marked with the day and minute they think the ice will break up. On the ice sits a tripod, connected by a rope to a clock on the shore. When the ice goes out, the tripod falls and stops the clock. That moment is the winner.

A vast tongue of warm water rises to the surface of the tropical Pacific, and the entire climate system begins to resonate in unison. This is El Niño, the most powerful natural climate oscillation, affecting weather from Australia to Alaska.

A rock chronicle where each layer is a page, and spectral analysis reads the rhythm of the lines. In the Realmonte salt mine in Sicily, geologists measured the thickness of 120 three-part cycles: a millimeter-scale clay parting, a thin anhydrite or polyhalite layer, and then a decimeter-scale halite bed.

In 1981, the ocean off the coast of Peru behaved strangely. The warm current that usually arrives every few years changed its rhythm, and scientists still argue about what exactly shifted. A new study offers a simple answer: the ocean sloshes like water in a bowl that is rocked by tides and Earth's rotation.

In 1997, the Pacific Ocean off the coast of Peru warmed so much that fish disappeared and torrential rains hit the desert. This is El Niño, a warm current that every few years changes weather across the planet. Predicting its arrival six months ahead is already possible, but looking further is like guessing a ship's route from a single point on a map.

An orchestra without a conductor: the instruments set their own rhythm. That is how one might describe the climate system of the Indo-Pacific region, where sea surface temperatures oscillate across many time scales, from seasonal to multi-decadal. Previously, to hear a single instrument, you had to pre-tune filters, cutting off everything else.

In 2014, forecasters around the world were expecting a powerful El Niño. The ocean had warmed, the trade winds had weakened, all the signs were there. But the event only came a year later. The Pacific seemed to change its mind.

A warm tongue of water stretches along the equatorial Pacific, and within weeks, Peru sees torrential rains while Australia's pastures dry out. That is how El Niño begins: a natural conductor that, at critical moments, makes only a few orchestra members play, but much louder.

The Paglia River behaves like a pendulum that resists being pushed. If a sudden influx of water pours in, the river does not keep gaining strength but quickly swings back to its usual level. This behavior is called antipersistence, and it was found in a twenty-two-year record of half-hourly discharge measurements near the Italian town of Orvieto.

An orchestra falls out of tune before a storm, then plays in unison again. In the equatorial Pacific, within a rectangle stretching from 5°S to 5°N and from 120°W to 170°W, water temperatures usually change in concert, like musicians playing the same part. This area is called the Niño 3.4 region.

Over the tropical Pacific, air pressure breathes with periods from two to fourteen years. The barometer on Tahiti rises while it falls in Darwin, Australia, and the entire planet's climate shudders: El Niño arrives. Meteorologists call this the Southern Oscillation and have tracked it for 138 years, but until now they couldn't answer a simple question: where do such periods come from?

Imagine a border river that separates two countries. On one bank live one group of people, on the other, another. The boundary between them is not always obvious: in some places the river is wide and calm, in others narrow and turbulent. But it is exactly where the current changes abruptly that the border becomes most noticeable.

The dance between two partners, the ocean and the sky, has been going on for thousands of years. El Niño warms the Pacific, and usually at the same time seasonal rains over India weaken. But in recent decades, the rhythm seems off: rains don't always respond to the warm current.

From 1955 to 1979, the extent of Antarctic sea ice shrank by 23% in winter and 67% in summer, then partially recovered. This is like a spring that was slowly compressed and then released: the climate of the Southern Hemisphere responded with a delay of several decades.

The devil's staircase is what mathematicians call a graph that looks like steps leading upward, but the steps are infinitely thin and packed without gaps.

Every June, the sky over India fills with moisture, and how much falls determines rice harvests, water reserves, and food prices for a billion people. But predicting the monsoon's strength in advance was like guessing someone's mood from a single photo: too many hidden springs.

Imagine a house of cards where each card supports the others. One wobbles, and the neighbors start to lean. Earth's climate system works similarly: ice sheets, ocean currents, tropical forests, all are connected. If one element crosses a threshold, it can drag the rest down with it.

A translator who learned a language from thousands of books can interpret a conversation without being distracted by noise in the hall. Similarly, a neural network trained on 127,137 years of model climate produces a winter forecast in a fraction of a second, faster and more accurately than bulky dynamical systems.

Every summer, a giant atmospheric engine unfolds over India: moist ocean winds bring the rains that sustain crops and the lives of two billion people. But this engine sputters, and forecasting it a season ahead remains elusive. Models give only rough answers, and a monsoon forecast error can cost millions of tons of food.

Lake Toba is a giant scale pan pressed down by three weights: the whims of the Pacific Ocean, a warming atmosphere, and human needs. The pan is slowly sinking: from 1957 to 2016, the water level dropped by an average of 2.4 centimeters per year. That is little for a single season, but over six decades it adds up to nearly one and a half meters.

The orchestra of world weather is playing a tune we didn't expect. The first violin is not carbon dioxide but chlorofluorocarbons—gases that until recently hid in refrigerators and aerosol cans. They trap heat ten thousand times more effectively than CO₂, and for decades they have been quietly warming the planet.

Every few years, warm Pacific waters rise to the surface off the coast of Peru, and the planet's weather goes off its usual schedule. This is El Niño, an irregular phenomenon that recurs every 3–7 years but still eludes precise forecasting.

Picture an orchestra where each instrument plays at its own tempo: violins speed up, woodwinds slow down, and percussion keeps losing the beat. That's roughly what Earth's climate looks like, with the ocean, the Sun, volcanoes, and human activity pulling temperature in different directions.

A translator in a large hall hears both a whisper right next to their ear and a conversation at the far end. The same mind picks up local nuances while keeping track of the overall discussion. That is how ResoNet works: a neural network that predicts El Niño. El Niño is a warm current in the equatorial Pacific that, every few years, alters weather across all continents.

Imagine sensitive scales scattered across Europe. Each GPS station is one such scale, recording daily how much the ground beneath it has risen or fallen. When water accumulates underground, the surface sags slightly; when water leaves, the surface lifts. These movements are tiny, on the order of millimeters, but the stations pick them up.

Every year, the same drama unfolds over West Africa: from June to September, the sky fills with moisture and releases rains that determine the harvests of millet, sorghum, and maize. This rainy season is driven by the West African monsoon, a giant atmospheric pump that pulls moist air from the ocean deep into the continent.

In 2015, downpours in Chennai turned streets into rivers overnight. The city was caught unprepared: seasonal models offered only a vague warning. Yet the monsoon is not a whim of the sky; it is the pulse of a vast machine linking oceans and continents.

Imagine a translator sitting in on a conversation between two parties: the ocean and the atmosphere. Usually, the translator conveys the meaning with a six-month delay, and in spring it loses the thread entirely. The new model, called CTEFNet, translates up to two years ahead and, on top of that, explains which remark turned the tide.

Climate forecasting is like a complex recipe: one wrong pinch and the whole dish is ruined. So it is with clouds — small but decisive. Climate models divide the sky into 50–100 km cells and don't see individual clouds. It's like throwing pepper by the handful when the recipe calls for a pinch.

After the Moon's birth, Earth resembled a sizzling lump of dough: a continuous liquid magma and a dense shroud of gases. The Moon acted like a giant spoon, constantly kneading this lump with its gravity. Friction generated heat, delaying cooling.

Every spring, El Niño forecasts lose their edge, like a translator who gets distracted by every rustle in the room and turns a one-hour meeting into a two-hour one. Scientists call this the spring predictability barrier: in March and April, models that confidently predicted a warm phase in the Pacific back in January start making mistakes twice as often.

The Moon is not just a rocky sphere, but a giant bell. Passing through it, gravitational waves cause it to vibrate almost imperceptibly. This tremor was predicted by Einstein, and Weber was the first to try to hear it with Earth-based detectors.

A warm ocean off the coast of Peru can make winter in Moscow unusually mild. Climate scientists call these invisible threads that link weather in distant corners of the planet teleconnections. For a long time, they were thought of as something like permanent wiring: the signal sources may pulse, but the wires themselves lie still.

Every hour, when the hands of a clock align at twelve, something happens in Earth's magnetosphere. It's as if an invisible conductor raises a baton, and waves race along magnetic field lines toward the surface. They're called pearls: on recordings, they look like a string of beads strung along time.

The ocean is like a layered cake: warm, light water on top, cold, heavy water below. Between the layers, at the interface, invisible waves roam. They don't lift crests like a storm; instead, they slowly rock the entire water column, as if someone were shaking a giant aquarium from within.