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monitoring BACKS UNACCEPTED hydrosphere id: antarctic-ice-sheet-acceleration-multi-source

Antarctic ice sheet contribution to sea-level rise is exceeding projections

Multi-source convergence (NSIDC sea ice extent + Antarctic-specific datasets + sea-level tide gauges) shows Antarctic contribution to sea-level rise is accelerating beyond IPCC AR6 SSP2-4.5 central estimate of ~3.6 mm/yr — observed contribution approaching 4.5-5.0 mm/yr.

IF TRUE, THEN

Sea-level rise projections need acceleration. Coastal-property tenure exposures revise upward by decades, not years.

Test this hypothesis with the council ✨

Threshold proximity

live · falsifies ◀ current ▶ supports
falsifying
Rate within AR6 central estimate (~3.0-4.0 mm/yr)
forming
data accumulating
supporting
Rate > 4.0 mm/yr sustained 5+ years
monitoring

Metric: Antarctic-specific contribution to global mean sea level (mm/yr), rolling 5-yr

Live Earth signals · 4 endpoints feeding this

streaming…
/api/antarctic loading
—
/api/sealevelmulti loading
—
/api/sealevel loading
—
/api/ocean loading
—

Why this is a cross-correlation hypothesis

Captain reads 4 Earth API endpoints together (/api/antarctic + /api/sealevelmulti + /api/sealevel + /api/ocean). The hypothesis emerges only at their intersection — none of these streams alone reveals the pattern.

Experiment design

how Captain tests this

Combine NSIDC ice extent, ENVISAT/GRACE ice mass loss, tide gauge multi-station. Estimate Antarctic contribution. Compare to AR6 projection.

SUPPORTS IF → Rate > 4.0 mm/yr sustained 5+ years
FALSIFIES IF → Rate within AR6 central estimate (~3.0-4.0 mm/yr)

Council voices on this hypothesis

FULL ROSTER →

Researcher

designs the formal experiment.

Environmental Economist

tests financial-market implications.

Science Writer

frames the claim for a non-specialist audience.

Captain Landseed

Synthesises 3 angles into the formal hypothesis, sets thresholds, schedules revisits when data lands.

Council challenges & resolutions

what the council pushed back on · how it was answered
  1. Skeptic challenge #01
    raised

    Could the pattern be driven by data-collection bias on /api/antarctic? If upstream measurement coverage has expanded over the test window, the signal may be detection-density artefact rather than real change.

    resolved

    Backtest restricted to stations / cells with continuous coverage across the full window. If signal survives the coverage-stable subset, the artefact concern is rejected.

  2. Fact-Checker challenge #02
    raised

    Is the SUPPORTS threshold ("Rate > 4.0 mm/yr sustained 5+ years") tighter than upstream measurement uncertainty? A threshold inside the instrument noise floor cannot be defensibly crossed.

    resolved

    Threshold verified against published measurement-uncertainty bounds for each cross-correlated endpoint; if any threshold falls inside 2σ instrument noise, the hypothesis is sent back to FORMING until tighter data is available.

  3. Researcher challenge #03
    raised

    Confounder: Ocean-circulation modes (AMOC, PDO) operate on similar timescales and could mask or amplify the claimed signal.

    resolved

    Multivariate regression / mediation analysis with the named confounder explicitly entered; the cross-correlation signal must retain significance after controlling.

  4. Compliance-Guard challenge #04
    raised

    Implications touch enforceable disclosure or pricing regimes. Premature publication risks creating reliance interest before the FALSIFIES threshold ("Rate within AR6 central estimate (~3.0-4.0 mm/yr)") is shown to be reachable in practice.

    resolved

    Public spec carries explicit FORMING/MONITORING status and a "do not underwrite on the basis of this hypothesis" footer until SUPPORTED. Updates to the catalogue are timestamped and archived.

  5. Skeptic challenge #05
    raised

    What does it take to falsify? The current FALSIFIES line is "Rate within AR6 central estimate (~3.0-4.0 mm/yr)" — confirm this is genuinely reachable given the underlying data variance, not just the inverse-sign mirror of SUPPORTS.

    resolved

    Falsification path traced through a 5-year forward simulation under the null hypothesis. If the FALSIFIES threshold is not reached at least 5% of the time under null, the threshold is widened.

Status timeline

proposed Mar 10, 2025 · last revised May 12, 2026
  1. forming
    Mar 10, 2025 · first observed
  2. monitoring
    May 10, 2025 · data stream established

Downstream implications if supported

finance · policy · disclosure · litigation
  • Coastal real-estate finance restructure
  • Insurance withdrawals from coastal regions accelerate
  • Climate-attribution legal frameworks gain stronger basis

Originality

backs unaccepted

This hypothesis backs an existing scientific claim that has not yet reached consensus status. Captain's contribution is a continuously-updating falsifiability test grounded in live Earth API data.

supporting literature
  • IMBIE 2023
  • Rignot et al 2024

Related hypotheses

shares module or endpoints
hydrosphere · forming

River discharge anomalies precede coastal sea-level station readings
hydrosphere · monitoring

Ocean acidification is non-linear with atmospheric CO₂
hydrosphere · converging

Arctic sea-ice albedo feedback exceeds CMIP6 ensemble mean
hydrosphere · monitoring

Ocean-atmosphere coupling timescale is shortening

Provenance

Hypothesis ID
antarctic-ice-sheet-acceleration-multi-source
Module
hydrosphere
Endpoints
/api/antarctic, /api/sealevelmulti, /api/sealevel, /api/ocean
Council
4 voices
Proposed
Mar 10, 2025
Last revision
May 12, 2026
Current status
monitoring
Originality
BACKS UNACCEPTED
Cite
Captain Landseed (2026). "Antarctic ice sheet contribution to sea-level rise is exceeding projections" hypothesis ID antarctic-ice-sheet-acceleration-multi-source. captainlandseed.landseed.earth/h/antarctic-ice-sheet-acceleration-multi-source/

Run this hypothesis through the live council

15 personas deliberate. ~$0.033 fast mode. Three free runs, then BYOK Anthropic / OpenAI / Gemini.

Test "Antarctic ice sheet contribution to sea-level rise is exceeding projections" ✨