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arxiv: 2602.09964 · v2 · submitted 2026-02-10 · ⚛️ physics.ao-ph · physics.geo-ph

Failure to track a stable AMOC state under rapid climate change

Ren\'e M. van Westen , Reyk B\"orner , Henk A. Dijkstra This is my paper

Pith reviewed 2026-05-16 03:09 UTC · model grok-4.3

classification ⚛️ physics.ao-ph physics.geo-ph
keywords AMOCAtlantic Meridional Overturning Circulationtipping elementrate of forcingocean circulationglobal warmingsea iceevaporation
0
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The pith

The AMOC remains stable to higher global warming under slow CO2 increases than under rapid ones due to ocean adjustment mechanisms.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper shows that whether the Atlantic Meridional Overturning Circulation collapses depends on the speed of climate forcing, not just the total amount of warming. Under slow forcing, the ocean adjusts its surface and interior properties together, aided by stronger evaporation and less sea ice, which offsets destabilizing effects and keeps the circulation running even at 5.5C of warming. Faster forcing blocks this adjustment, so the AMOC tips at only about 2C. This rate dependence matters because human emissions are currently rising quickly, which could push the system past a tipping point sooner than fixed-threshold estimates suggest.

Core claim

AMOC stability rather depends on the rate of radiative forcing change. Slow forcing permits coherent adjustment of surface and interior ocean properties, supported by enhanced evaporation and reduced sea-ice extent, counteracting destabilising feedbacks. In a slow CO2 ramp simulation at +0.5 ppm/yr the AMOC remains stable up to +5.5C of global warming, whereas faster ramps produce collapse at substantially lower warming levels around +2C.

What carries the argument

The rate-dependent stabilizing mechanism that allows coherent surface-interior ocean property adjustments when radiative forcing changes slowly.

If this is right

  • The commonly cited +4C warming threshold for AMOC collapse does not hold under rapid forcing rates.
  • AMOC can persist at higher total warming if the rate of greenhouse gas increase stays low enough for ocean adjustments to occur.
  • Current rates of forcing change are fast enough to bypass the stabilizing mechanism.
  • Limiting the speed of emissions reduces near-term collapse risk even if total warming eventually exceeds 4C.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Emission policies that slow the pace of increase could be more effective at avoiding AMOC tipping than policies focused only on cumulative totals.
  • The same rate sensitivity may apply to other ocean-based tipping elements such as Antarctic ice shelves.
  • Higher-resolution models that better resolve evaporation and sea-ice changes could shift the exact rate thresholds found here.

Load-bearing premise

The climate model accurately represents the stabilizing feedbacks from enhanced evaporation and reduced sea-ice extent under slow forcing.

What would settle it

Direct comparison of AMOC strength in the same model under a slow CO2 ramp versus a fast ramp, or paleoclimate evidence showing different collapse thresholds for slow versus rapid past warming episodes.

read the original abstract

The Atlantic Meridional Overturning Circulation (AMOC) is a tipping element of the climate system. The current estimate of the global warming threshold for the onset of an AMOC collapse is +4.0C (uncertainty range 1.4-8C). However, such a threshold may not be meaningful because AMOC stability rather depends on the rate of radiative forcing change. Here, we identify an AMOC stabilising mechanism that operates on timescales longer than present-day radiative forcing increase. Slow forcing permits coherent adjustment of surface and interior ocean properties, supported by enhanced evaporation and reduced sea-ice extent, counteracting destabilising feedbacks. We explicitly demonstrate this mechanism in a slow CO2 ramp (+0.5 ppm/yr) climate model simulation, in which the AMOC remains stable up to +5.5C of global warming. By contrast, under faster CO2 ramps, the AMOC collapses at substantially lower warming levels (+2C). Our findings demonstrate rate-induced AMOC tipping and imply that limiting the rate of greenhouse gas emissions is critical for reducing the near-term risk of an AMOC collapse.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript claims that AMOC stability is rate-dependent rather than governed by a fixed warming threshold. In a slow CO2 ramp simulation (+0.5 ppm/yr), the AMOC remains stable up to +5.5°C global warming due to coherent surface-interior adjustment supported by enhanced evaporation and reduced sea-ice extent; faster ramps cause collapse at ~+2°C. This implies that limiting the rate of greenhouse gas emissions is critical to reduce near-term collapse risk.

Significance. If the rate-dependent mechanism holds beyond the single model, the result would be significant for climate dynamics and policy, shifting emphasis from absolute warming thresholds to forcing rates for tipping elements. The direct simulation approach provides a concrete, non-circular demonstration of the proposed stabilizing feedbacks.

major comments (3)
  1. [Abstract and Results] Abstract and Results: The central claim of rate-induced tipping rests on a single climate-model simulation without reported ensemble size, error bars, or statistical tests on the +5.5°C stability versus +2°C collapse thresholds; this limits evaluation of robustness to internal variability and makes the quantitative contrast load-bearing for the rate-dependence conclusion.
  2. [Methods] Methods: No details are provided on the specific model, resolution, parameterization of evaporation and sea-ice processes, or how the CO2 ramps are implemented, preventing assessment of whether the claimed stabilizing feedbacks (enhanced evaporation, reduced sea-ice) dominate over unrepresented processes such as freshwater fluxes or eddy mixing.
  3. [Discussion] Discussion: The assumption that the identified mechanism generalizes is not tested via cross-model comparisons or sensitivity experiments; if the chosen model under-represents destabilizing feedbacks that become dominant at higher warming, the reported rate dependence may be model-specific rather than a general physical result.
minor comments (2)
  1. [Abstract] Abstract: Specify the exact metric and reference period used for the reported global warming levels (+5.5°C, +2°C) to avoid ambiguity.
  2. [Figures] Figures: Ensure time series of AMOC strength and surface fluxes include clear labels for ramp rates and warming levels for direct comparison.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive comments, which have improved the clarity and transparency of our manuscript. We address each major point below and have revised the paper accordingly.

read point-by-point responses

  1. Referee: [Abstract and Results] Abstract and Results: The central claim of rate-induced tipping rests on a single climate-model simulation without reported ensemble size, error bars, or statistical tests on the +5.5°C stability versus +2°C collapse thresholds; this limits evaluation of robustness to internal variability and makes the quantitative contrast load-bearing for the rate-dependence conclusion.

    Authors: We agree that ensemble statistics would provide stronger quantification of robustness to internal variability. The simulations are single realizations owing to the prohibitive computational cost of multi-century ramp experiments. We have revised the Results section to report variability measures from the pre-industrial control integration and clarified that the reported thresholds (+5.5 °C vs. ~+2 °C) are indicative of the qualitative rate dependence rather than precise statistical bounds. The core demonstration—that slower ramps permit stabilizing adjustments while faster ramps do not—remains supported by the direct comparison across forcing rates. revision: partial

  2. Referee: [Methods] Methods: No details are provided on the specific model, resolution, parameterization of evaporation and sea-ice processes, or how the CO2 ramps are implemented, preventing assessment of whether the claimed stabilizing feedbacks (enhanced evaporation, reduced sea-ice) dominate over unrepresented processes such as freshwater fluxes or eddy mixing.

    Authors: We have added a comprehensive Methods section that specifies the climate model, horizontal and vertical resolution, the exact CO2 ramp implementation (+0.5 ppm yr⁻¹ and faster rates), and the relevant parameterizations for evaporation, sea-ice thermodynamics, and surface fluxes. We also discuss the representation of freshwater fluxes and sub-grid mixing and note their potential influence on the diagnosed mechanism. revision: yes

  3. Referee: [Discussion] Discussion: The assumption that the identified mechanism generalizes is not tested via cross-model comparisons or sensitivity experiments; if the chosen model under-represents destabilizing feedbacks that become dominant at higher warming, the reported rate dependence may be model-specific rather than a general physical result.

    Authors: We accept that the results are from a single model and have not performed cross-model tests. The revised Discussion now explicitly states that the rate-dependent stability is demonstrated within this model configuration and may be sensitive to model-specific representations of destabilizing processes. We retain the physical argument that coherent surface-interior adjustment can counteract tipping under slow forcing, but we frame the quantitative thresholds as model-dependent and call for multi-model verification. revision: yes

Circularity Check

0 steps flagged

No circularity: results are direct outputs of climate model simulations

full rationale

The paper reports AMOC stability thresholds (+5.5 °C under +0.5 ppm/yr CO2 ramp; collapse at +2 °C under faster ramps) as emergent results from numerical integrations of a climate model. No load-bearing steps reduce to self-defined quantities, fitted parameters renamed as predictions, or self-citation chains. The stabilizing mechanism (enhanced evaporation, reduced sea-ice) is identified from the simulation diagnostics rather than presupposed by construction. The derivation chain consists of forward model runs whose outputs are independent of any internal redefinition or circular fit.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on the validity of the climate model simulations and the interpretation of the stabilizing mechanism from enhanced evaporation and reduced sea-ice under different forcing rates.

free parameters (1)
  • CO2 ramp rate = +0.5 ppm/yr
    Chosen to represent slow forcing scenario at +0.5 ppm/yr.
axioms (1)
  • domain assumption Climate model physics accurately capture ocean-atmosphere interactions and feedbacks including evaporation and sea-ice effects
    Relied upon for the simulation results to be meaningful and generalizable.

pith-pipeline@v0.9.0 · 5504 in / 1371 out tokens · 135696 ms · 2026-05-16T03:09:44.684862+00:00 · methodology

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