New simulations reveal what lies beneath Jupiter’s impenetrable clouds

Jupiter’s deep atmosphere appears to contain significantly more oxygen than long debated, according to a new modeling study that also shows the planet’s internal atmospheric circulation is far slower than previously assumed. The findings offer a clearer picture of how the largest planet in the solar system formed and how giant planet atmospheres behave beneath thick cloud layers.

The study, published on January 8 in The Planetary Science Journal, was led by scientists from the University of Chicago in collaboration with researchers at the Jet Propulsion Laboratory. By combining advanced chemical modeling with atmospheric fluid dynamics, the team produced the most comprehensive simulation yet of Jupiter’s deep atmosphere.

At the core of the research is a long-standing question in planetary science: how much oxygen Jupiter contains. The new analysis indicates that Jupiter’s deep atmosphere holds about 1.0–1.5 times as much oxygen as the Sun.

This narrows a wide range of earlier estimates and aligns with the lower bound of values inferred from microwave measurements made by NASA’s Juno mission.

Oxygen is difficult to measure directly on Jupiter because it is mostly locked in water, which condenses and sinks deep below the visible clouds. Instead, scientists rely on carbon monoxide as a proxy. Carbon monoxide remains chemically stable at great depths, preserving a record of the oxygen abundance in regions that spacecraft cannot reach.

Previous studies diverged sharply on this value, with some suggesting Jupiter contained only about one-third the Sun’s oxygen abundance, but the new model reconciles much of this disagreement by coupling atmospheric chemistry and dynamics, allowing cloud formation, chemical reactions, and vertical transport to interact self-consistently.

Equally important, the model shows that vertical mixing in Jupiter’s atmosphere is far slower than long assumed, with diffusion about 35–40 times weaker than standard estimates, meaning individual molecules may take weeks rather than hours to move between atmospheric layers.

This slower circulation is tied to cloud physics, as water condensation stabilizes parts of the atmosphere, suppresses convection, and reduces vertical transport, helping explain why earlier chemical models that assumed strong deep-atmosphere mixing failed to match observations.

The results place Jupiter’s long-observed cloud cover in a deeper context. Jupiter has been observed for at least 360 years, ever since early telescopic astronomers recorded a large, persistent feature on its disk. That feature, now known as the Great Red Spot, remains the most visible reminder that Jupiter’s atmosphere is dominated by enormous, long-lived storms.

The Great Red Spot spans roughly 16 000 km (10 000 miles), about twice Earth’s diameter, and is just one of many vortices within a planet-wide system of cloud bands driven by winds exceeding 400 km/h (250 mph). Despite centuries of observation, these storms have concealed the deeper structure of Jupiter’s atmosphere.

Direct exploration has proven impossible, as NASA’s Galileo spacecraft was destroyed by extreme pressure and temperature during its 2003 descent into Jupiter’s atmosphere before reaching deeper cloud layers, leaving scientists to rely on remote sensing and modeling to infer conditions below the clouds.

From orbit, NASA’s Juno mission has measured Jupiter’s gravity, magnetic field, and microwave emissions. These observations reveal the composition of the upper atmosphere, including ammonia, methane, ammonium hydrosulfide, water, and carbon monoxide. Deeper regions remain beyond direct measurement.

Understanding Jupiter’s oxygen abundance has implications far beyond the planet itself. All planets formed from the same primordial material as the Sun, but differences in elemental ratios preserve clues about where and how they formed. Water plays a central role, as ice is easier for growing planets to accrete than water vapor, especially far from the Sun.

If Jupiter formed farther from the Sun and later migrated inward, its oxygen content would reflect that history. The new results help narrow the range of plausible formation scenarios and suggest that Jupiter accreted material under conditions that favored a modest enrichment in oxygen.

The modeling framework has broader relevance for poorly understood ice giants such as Uranus and Neptune and for exoplanet atmospheres, where vertical mixing rates are highly uncertain, as deriving atmospheric transport directly from physical simulations rather than assumptions could improve interpretations of distant worlds.

Even after centuries of observation and decades of spacecraft exploration, Jupiter continues to challenge assumptions. The new results show that its deep atmosphere is chemically rich, dynamically complex, and far less vertically mixed than once believed, reinforcing Jupiter’s role as a natural laboratory for understanding how giant planets form and evolve.

References:

¹ Computer models let scientists peer into the mystery beneath Jupiter’s clouds – UChicago News – January 13, 2026

² Coupled 1D Chemical Kinetic Transport and 2D Hydrodynamic Modeling Supports a Modest 1–1.5× Supersolar Oxygen Abundance in Jupiter’s Atmosphere – Jeehyun Yang, Ali Hyder, Renyu Hu and Jonathan I. Lunine – The Planetary Science Journal – January 8, 2026 – https://iopscience.iop.org/article/10.3847/PSJ/ae28d5/meta – OPEN ACCESS

Reet Kaur

I’m a science journalist and researcher at The Watchers, contributing to the Epicenter edition, where I cover peer-reviewed scientific research and emerging discoveries across Earth and space sciences. With a background in astronomy and a passion for environmental science, I’ve worked in shark and coral conservation in Fiji, conducting reef and shark-behavior research, contributing to mangrove restoration, and earning PADI Open Water and Coral Reef Certifications. I bring a blend of scientific rigor and storytelling to illuminate the discoveries shaping our planet and beyond.

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