Ocean Acidification

DISCLAIMER — Real Science, the Boundary's Own Definition Under Active Revision

Why no UTAC/CREP/AFET bridge: not only because the cited literature already provides the necessary quantitative structure -- a deliberate choice. This project's highly speculative AFET/UTAC experiments must never stand in the way of climate/ecology topics being accessible and usable to people who don't work inside that construct and aren't looking for renormalization groups. Real, checkable science, without the burden of an unproven framework. See PACKAGE_REGISTRY.md's "Why no UTAC/CREP/AFET bridge in the climate/ecology series" (2026-08-31) in the GenesisAeon workspace root for the full canonical note.

Status: Real, independently verified science, including a real, ongoing scientific revision of the package's own headline metric. NO UTAC/CREP/AFET bridge.

Where this package came from

Surfaced via a six-document multi-AI gap-analysis of the GenesisAeon climate/ecology portfolio (KlimaAktuell/, six independently-produced documents: ChatGPT, Claude-Web, Gemini, MSCopilot, Vibe, Grok, 2026-09-01), cross-checked against PACKAGE_REGISTRY.md to confirm ocean acidification was a genuine, uncovered gap, then independently deep-dive re-verified (a second research pass specifically checking for overlooked complications/updates) before building.

What this is

Every citation checked directly via WebSearch/WebFetch against publisher/press pages, 2026-09-01.

• **Findlay, H.S., Feely, R.A., Jiang, L.-Q., Pelletier, G., Bednarsek,
• N. (2025)*, Global Change Biology*, e70238, DOI: 10.1111/gcb.70238
• — real, peer-reviewed: the ocean acidification planetary boundary
• (defined via aragonite saturation state, Omega-arag, dropping to 80%
• of pre-industrial levels

…

ocean-acidification-utac

GenesisAeon Package 122 — real ocean acidification planetary-boundary science, including the boundary metric's own active scientific revision. Deliberately has no UTAC/CREP/AFET bridge — see DISCLAIMER.md.

For a plain-language explanation of the same topic (German, no jargon, written for general audiences), see WHITEPAPER.md.

Where this package came from

Surfaced via a six-document multi-AI gap-analysis of the GenesisAeon climate/ecology portfolio (KlimaAktuell/, 2026-09-01), then independently deep-dive verified before building — alongside tropical-glacier-ecosystem-rle-utac (P123), marine-compound-stressors-utac (P124), assisted-gene-flow-utac (P125), and climate-landuse-biodiversity-nexus-utac (P126).

What's real here

• Findlay et al. (2025, Global Change Biology)* — the ocean
• acidification planetary boundary has been crossed globally: ~40% of
• surface ocean and ~60% of subsurface ocean (to 200m), crossing
• estimated to have begun around 2020. The boundary's own explicit
• framing: this is not a tipping point — no abrupt, self-reinforcing
• regime shift is implied, and reversal via reduced emissions is
• theoretically possible.
• Findlay & Feely (2026, National Science Review)* — the SAME lead
• author revisiting the boundary and finding it doesn't hold up on its
• own terms: the original 80%-of-preindustrial threshold was meant to
• (1) prevent polar undersaturation and (2) protect warm-water coral
• reefs — but Arctic waters are already undersaturated today, and
• reefs would actually need an 85%, not 80%, threshold.

Quickstart

bash pip install ocean-acidification-utac

```python from ocean_acidification_utac import ( surface_ocean_boundary_crossed_pct, subsurface_ocean_boundary_crossed_pct, is_boundary_crossing_a_tipping_point, does_80pct_threshold_meet_original_criteria, is_arctic_already_undersaturated_today, )

print(surface_ocean_boundary_crossed_pct()) # 40.0 print(subsurface_ocean_boundary_crossed_pct()) # 60.0 print(is_boundary_crossing_a_tipping_point()) # False print(does_80pct_threshold_meet_original_criteria()) # False -- the honesty check print(is_arctic_already_undersaturated_today()) # True ```

Development

bash pip install -e ".[dev]" pre-commit install ruff check src tests mypy src pytest

Citation

See CITATION.cff and .zenodo.json.