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Global ocean acidification has passed safe planetary boundary threshold: Study https://news.mongabay.com/short-article/2025/06/global-ocean-acidification-has-passed-safe-planetary-boundary-threshold-study/

Global ocean acidification has passed safe planetary boundary threshold: Study
A new assessment finds that the world’s oceans crossed the safe threshold for acidification in 2020, breaching a key planetary boundary and posing serious threats to marine life. Ocean acidification is caused when excess atmospheric carbon dioxide, resulting from human activities like burning fossil fuels, dissolves in seawater, forming carbonic acid that increases the water’s […]

‘Ticking Time Bomb’ of Ocean Acidification Has Already Crossed Planetary Boundary, Threatening Marine Ecosystems: Study https://www.ecowatch.com/ocean-acidification-planetary-boundary.html

‘Ticking Time Bomb’ of Ocean Acidification Has Already Crossed Planetary Boundary, Threatening Marine Ecosystems: Study
A new study has found that ocean acidification is not only getting worse, but crossed its “planetary boundary” roughly five years ago.

Statistical State Dynamics based study of turbulence in Eady fronts. Part 1. Instability
Eojin Kim, Brian F. Farrell
https://arxiv.org/abs/2506.11993 https…

Statistical State Dynamics based study of turbulence in Eady fronts. Part 1. Instability
The streamwise roll and streak structure (RSS) is prominent in observations of the planetary boundary layer in the atmosphere and ocean and in unstratified wall-bounded shear flows. Although the RSS in these systems is structurally similar, the mechanism forming and maintaining the RSS in both remains controversial. This study demonstrates that the same turbulence-sustaining mechanism identified to underlie the RSS in the Statistical State Dynamics (SSD) formulation of unstratified wall-bounded…

Model for the Thermodynamics of Iron at High Pressures Near Melting
Rann Shikler, Noya Dimanstein Firman, Yinon Ashkenazy
https://arxiv.org/abs/2506.03386 …

Model for the Thermodynamics of Iron at High Pressures Near Melting
The Fe pressure-temperature phase diagram and its melting line have a wide range of applications, including providing constraints for iron-core planetary models. We propose an equation of state (EOS) model based on the interstitial theory of simple condensed matter (ITCM), as suggested by A.V. Granato. When applied to Fe, this model enables the extrapolation of measured melting lines to the conditions of the Earth's inner core boundary (ICB). The ITCM describes the solid-liquid phase transition…