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Showing 1–18 of 18 results
Advanced filters: Author: Kevin Zahnle Clear advanced filters

  • Observations from the JWST show the presence of a spectral absorption feature at 4.05 μm arising from SO2 in the atmosphere of the gas giant exoplanet WASP-39b, which is produced by photochemical processes and verified by numerical models.

    • Shang-Min Tsai
    • Elspeth K. H. Lee
    • Sergei N. Yurchenko
    ResearchOpen Access
    Nature
    Volume: 617, P: 483-487

  • Ashes of ancient meteors recovered from a 2.7-billion-year-old lake bed imply that the upper atmosphere was rich in oxygen at a time when all other evidence implies that the atmosphere was oxygen-free. See Letter p.235

    • Kevin Zahnle
    • Roger Buick
    News & Views
    Nature
    Volume: 533, P: 184-186

  • A glitch in the history of sulphur isotopes could imply that methane emitted by the ancient biosphere created a high-altitude photochemical smog, which governed the climate in a distinctly Gaian way.

    • Kevin Zahnle
    News & Views
    Nature
    Volume: 454, P: 41-42

  • A decrease in atmospheric methane levels might have triggered the progressive rise of atmospheric oxygen about 2.4 billion years ago, but the cause of this methane decrease remains uncertain. Kurt Konhauser and colleagues report a decline in the oceanic nickel-to-iron ratio about 2.7 billion years ago, which they attribute to a reduced flux of nickel to the oceans; this decline would have stifled the activity of methane-producing organisms that require nickel to function.

    • Kurt O. Konhauser
    • Ernesto Pecoits
    • Balz S. Kamber
    Research
    Nature
    Volume: 458, P: 750-753

  • The protoplanets that collided to make the Earth may themselves have had atmospheres and oceans. Venus has vastly more argon and neon than Earth: fossil evidence, perhaps, of protoplanetary atmospheres?

    • Kevin Zahnle
    News & Views
    Nature
    Volume: 433, P: 814-815

  • As a moist atmosphere warms, it will reach a limit after which it is unable to radiate incoming solar radiation back to space, and a runaway greenhouse will occur. Calculations suggest that this limit is lower than previously thought and, for a water-saturated atmosphere, a runaway greenhouse can occur under present-day solar radiation.

    • Colin Goldblatt
    • Tyler D. Robinson
    • David Crisp
    Research
    Nature Geoscience
    Volume: 6, P: 661-667

  • Geochemical analyses and climate modelling suggest that 2.5 billion years ago much of the nitrogen now stored in the solid Earth was in the atmosphere, and that the higher atmospheric nitrogen levels would have increased the efficacy of greenhouse gases, thus warming the Earth.

    • Colin Goldblatt
    • Mark W. Claire
    • Kevin J. Zahnle
    Research
    Nature Geoscience
    Volume: 2, P: 891-896