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arxiv: 2605.15699 · v1 · pith:7EKWQXANnew · submitted 2026-05-15 · ⚛️ physics.ao-ph

Multi-stability of Atlantic and Pacific overturning: The role of Freshwater Forcing Asymmetries and the Hydrological Cycle

Elian Vanderborght , Oliver Mehling , Henk A. Dijkstra This is my paper

Pith reviewed 2026-05-19 19:03 UTC · model grok-4.3

classification ⚛️ physics.ao-ph
keywords global overturning circulationAtlantic Meridional Overturning CirculationPacific overturningfreshwater forcinghydrological cyclemulti-stabilityocean basinsclimate states
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The pith

Freshwater forcing asymmetries and hydrological cycle strength determine whether sinking occurs in both Atlantic and Pacific or is confined to one basin.

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

The paper uses a two-basin ocean model to explore the stability of different global overturning configurations. It finds that with a weak hydrological cycle, both basins can sustain sinking, breaking symmetry only with strong evaporation differences. Intermediate cycle strengths favor sinking in the narrower, more evaporative basin. Strong cycles promote single-basin sinking but still need notable asymmetry to lock it in. These patterns help interpret overturning behavior across different climate states and match results from full global models.

Core claim

The two-basin model admits three overturning states: sinking confined to the narrow basin, to the wide basin, or in both. Their existence and stability vary with the freshwater asymmetry between basins and the strength of the symmetric hydrological cycle. Weak cycles allow dual-basin sinking unless asymmetry is large; intermediate cycles show preference for the narrow evaporative basin; strong cycles favor single-basin states requiring larger asymmetry for uniqueness. The findings align with three-dimensional global circulation model simulations.

What carries the argument

The two-basin conceptual ocean model with a wide and narrow basin, parameterized by inter-basin freshwater asymmetry and the strength of the longitudinally symmetric freshwater flux.

Load-bearing premise

The two-basin conceptual ocean model with simplified geometry and freshwater forcing sufficiently captures the essential mechanisms that determine the existence and stability of overturning states in the real global ocean.

What would settle it

Running the three-dimensional global circulation model with freshwater asymmetry and hydrological cycle parameters where the conceptual model predicts dual-basin sinking but finding no such stable state would challenge the claim.

read the original abstract

A defining feature of the present-day global overturning circulation (GOC) is the absence of deep water formation in the Pacific, in contrast to the Atlantic. This asymmetry, associated with higher surface salinities in the North Atlantic, is reflected in the Atlantic Meridional Overturning Circulation (AMOC) and the lack of a Pacific overturning (PMOC). A commonly cited explanation is the asymmetry in surface freshwater fluxes, with the Pacific receiving more freshwater per unit area than the Atlantic. Here, we develop a two-basin conceptual ocean model, consisting of a wide and a narrow basin. The model admits three states: sinking confined to the narrow basin, sinking confined to the wide basin, and sinking in both basins. We analyze the (co-)existence of these states as a function of freshwater asymmetry and hydrological cycle strength, defined as the longitudinally symmetric freshwater flux. For a weak hydrological cycle, representative of warm Pliocene-like climate conditions, sinking occurs in both basins, with symmetry breaking only when one basin is sufficiently more evaporative. For intermediate conditions, representative of the present-day climate, the basin with slightly stronger evaporation tends to host sinking, with a stronger preference in the narrow basin. For a strong hydrological cycle, single-basin sinking states are preferred, although a large interbasin freshwater asymmetry is required to uniquely localize sinking. These results provide insight into GOC sinking configurations under past, present, and potential future climates, and show good agreement with a three-dimensional global circulation model.

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

2 major / 2 minor

Summary. The manuscript develops a two-basin conceptual ocean model (wide and narrow basins) to study multi-stability of the global overturning circulation. It identifies three states—sinking confined to the narrow basin, to the wide basin, or in both—and maps their existence and co-existence as functions of freshwater asymmetry and hydrological-cycle strength (longitudinally symmetric freshwater flux). For weak hydrological cycles (Pliocene-like), both basins sink except at large asymmetry; for intermediate (present-day) conditions, the narrow basin is preferred; for strong cycles, single-basin states dominate unless asymmetry is large. Qualitative agreement with a 3D GCM is reported, with implications for past, present, and future GOC configurations.

Significance. If the bifurcation structure holds, the work supplies a transparent mechanistic account of how freshwater asymmetries and hydrological-cycle intensity control Atlantic-Pacific overturning asymmetry. The explicit parameter study and identification of multi-stability regimes offer a useful interpretive lens for paleoclimate (e.g., Pliocene both-basin sinking) and future projections. The reported qualitative match to a 3D GCM is a positive feature that strengthens the conceptual results, though its quantitative robustness remains to be verified.

major comments (2)
  1. [§4] §4 (Model formulation and geometry): The central mapping of the three states rests on the assumption of no interbasin exchange at depth and idealized basin widths. The paper does not report a sensitivity experiment restoring a simple Indonesian throughflow or Southern Ocean connection; such terms could shift the critical freshwater-asymmetry thresholds by tens of percent and thereby alter the reported Pliocene-like 'both-basin' regime and present-day narrow-basin preference.
  2. [Results section] Results section (comparison with 3D GCM): The abstract states 'good agreement with a three-dimensional global circulation model,' yet no table or figure directly compares the conceptual-model critical asymmetry values (e.g., the symmetry-breaking threshold for weak hydrological cycle) against the corresponding GCM thresholds. Without this quantitative anchor or explicit statement of how GCM freshwater fluxes were tuned to the conceptual parameters, the transferability claim is not yet load-bearing.
minor comments (2)
  1. [Figure 2] Figure 2 (bifurcation diagrams): The stable/unstable branches and the location of the saddle-node bifurcations should be labeled explicitly to make the co-existence regions immediately readable.
  2. [Notation] Notation: The definition of 'hydrological cycle strength' as the longitudinally symmetric freshwater flux is clear in the text but should be restated once in the figure captions that use this parameter.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive and positive review. The comments highlight important aspects of model idealizations and the strength of the GCM comparison. We address each major comment below and propose targeted revisions that preserve the conceptual focus of the work while improving transparency.

read point-by-point responses

  1. Referee: [§4] §4 (Model formulation and geometry): The central mapping of the three states rests on the assumption of no interbasin exchange at depth and idealized basin widths. The paper does not report a sensitivity experiment restoring a simple Indonesian throughflow or Southern Ocean connection; such terms could shift the critical freshwater-asymmetry thresholds by tens of percent and thereby alter the reported Pliocene-like 'both-basin' regime and present-day narrow-basin preference.

    Authors: We agree that the lack of explicit interbasin exchange at depth and the use of fixed basin widths constitute deliberate simplifications. These choices enable the analytical bifurcation analysis that forms the core of the study. Adding parameterized throughflow or Southern Ocean connections would move the model toward a more numerical framework and could indeed shift quantitative thresholds. Because the manuscript is positioned as a minimal conceptual model, we will add a dedicated paragraph in the revised §4 (and a short discussion subsection) that acknowledges this limitation, references relevant literature on interbasin transport, and explains why the qualitative regime structure is expected to remain robust. We do not plan to perform new numerical sensitivity experiments at this stage. revision: partial

  2. Referee: [Results section] Results section (comparison with 3D GCM): The abstract states 'good agreement with a three-dimensional global circulation model,' yet no table or figure directly compares the conceptual-model critical asymmetry values (e.g., the symmetry-breaking threshold for weak hydrological cycle) against the corresponding GCM thresholds. Without this quantitative anchor or explicit statement of how GCM freshwater fluxes were tuned to the conceptual parameters, the transferability claim is not yet load-bearing.

    Authors: The reported agreement is qualitative and concerns the existence of the three overturning states and their dependence on hydrological-cycle strength, as shown by the regime diagrams in the results section. The GCM freshwater fluxes were selected to represent weak (Pliocene-like), intermediate (present-day), and strong cycles but were not retuned to match the conceptual-model parameters exactly. To address the concern, we will insert a new table that tabulates the conceptual-model critical asymmetry values for each hydrological-cycle regime alongside the corresponding GCM behavior (single-basin vs. dual-basin sinking). We will also add a brief methods paragraph clarifying the parameter correspondence. These additions will make the comparison more explicit without altering the qualitative nature of the claim. revision: yes

Circularity Check

0 steps flagged

No circularity: states emerge from external parameter sweeps in a self-contained conceptual model

full rationale

The paper constructs a two-basin box model with explicit freshwater forcing terms (asymmetry and symmetric hydrological cycle strength) as independent inputs. The three overturning states and their existence ranges are obtained by solving the model's steady-state equations and bifurcation analysis while varying those external parameters; no equation defines a state in terms of itself or renames a fitted output as a prediction. The reported agreement with a 3D GCM is presented as external validation rather than a load-bearing input or self-citation chain. The derivation chain therefore remains independent of its target results.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

The central claim rests on the adequacy of a highly idealized two-basin geometry and on the assumption that freshwater fluxes can be decomposed into a symmetric hydrological-cycle component and an asymmetric component without losing essential dynamics.

free parameters (2)
  • freshwater asymmetry
    Inter-basin difference in net freshwater flux, varied to explore symmetry breaking.
  • hydrological cycle strength
    Longitudinally symmetric freshwater flux magnitude, used to represent different climate regimes.
axioms (1)
  • domain assumption Ocean basins can be represented as one narrow and one wide basin whose width difference controls sinking preference.
    The model is defined as consisting of a wide and a narrow basin.

pith-pipeline@v0.9.0 · 5819 in / 1559 out tokens · 67113 ms · 2026-05-19T19:03:14.287843+00:00 · methodology

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