← Back to catalogue
converging BACKS UNACCEPTED hydrosphere id: sea-ice-albedo-feedback

Arctic sea-ice albedo feedback exceeds CMIP6 ensemble mean

Per million km² of Arctic sea-ice loss, equilibrium temperature response is 0.15-0.30°C — exceeding CMIP6 multi-model mean of 0.08-0.12°C.

IF TRUE, THEN

Arctic amplification beats projections; ice-free summer ≤ 2035 instead of 2050+. Polar bear / walrus / ice-dependent species insurance accelerates losses.

Test this hypothesis with the council ✨

Threshold proximity

live · falsifies ◀ current ▶ supports
falsifying
Slope within CMIP6 ensemble range (0.05-0.15)
forming
data accumulating
supporting
Observed slope > 0.20 °C per 10⁶ km²
converging

Metric: Slope of regional Arctic temperature anomaly vs sea-ice extent loss (10-yr rolling)

Live Earth signals · 3 endpoints feeding this

streaming…
/api/seaice loading
—
/api/antarctic loading
—
/api/temp loading
—

Why this is a cross-correlation hypothesis

Captain reads 3 Earth API endpoints together (/api/seaice + /api/antarctic + /api/temp). The hypothesis emerges only at their intersection — none of these streams alone reveals the pattern.

Experiment design

how Captain tests this

Per-month: regional Arctic 60°N-90°N temperature anomaly against NSIDC sea-ice extent. Compute slope. Compare to CMIP6 ensemble.

SUPPORTS IF → Observed slope > 0.20 °C per 10⁶ km²
FALSIFIES IF → Slope within CMIP6 ensemble range (0.05-0.15)

Council voices on this hypothesis

FULL ROSTER →

Researcher

designs the formal experiment.

Environmental Economist

tests financial-market implications.

Captain Landseed

Synthesises 2 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/seaice? 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 ("Observed slope > 0.20 °C per 10⁶ km²") 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. Skeptic challenge #04
    raised

    What does it take to falsify? The current FALSIFIES line is "Slope within CMIP6 ensemble range (0.05-0.15)" — 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 Jul 6, 2025 · last revised Mar 10, 2026
  1. forming
    Jul 6, 2025 · first observed
  2. monitoring
    Sep 6, 2025 · data stream established
  3. converging
    Nov 6, 2025 · trend strengthening

Downstream implications if supported

finance · policy · disclosure · litigation
  • Arctic shipping route emergence accelerates
  • Indigenous Arctic community displacement timelines compress
  • Carbon-budget for 1.5°C compatible with much lower cumulative emissions than current targets

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
  • Pithan & Mauritsen 2014 Nat. Geo.
  • Feldl & Roe 2013 J. Climate

Related hypotheses

shares module or endpoints
hydrosphere · monitoring

Ocean-atmosphere coupling timescale is shortening
hydrosphere · monitoring

Coral bleaching is the earliest detectable ocean cascade signal
hydrosphere · monitoring

Marine fisheries are migrating poleward faster than predicted
hydrosphere · monitoring

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

Provenance

Hypothesis ID
sea-ice-albedo-feedback
Module
hydrosphere
Endpoints
/api/seaice, /api/antarctic, /api/temp
Council
3 voices
Proposed
Jul 6, 2025
Last revision
Mar 10, 2026
Current status
converging
Originality
BACKS UNACCEPTED
Cite
Captain Landseed (2026). "Arctic sea-ice albedo feedback exceeds CMIP6 ensemble mean" hypothesis ID sea-ice-albedo-feedback. captainlandseed.landseed.earth/h/sea-ice-albedo-feedback/

Run this hypothesis through the live council

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

Test "Arctic sea-ice albedo feedback exceeds CMIP6 ensemble mean" ✨