Pith Number

pith:IGHCAAYB

pith:2026:IGHCAAYB4I6JINWOGWBX4GOCBM

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Drag-Controlled Regime Transitions in the Eddy Saturation Mechanism of the Antarctic Circumpolar Current

Atsushi Kubokawa, Takuro Matsuta, Yuki Tanaka

Below a wind-to-friction threshold, Antarctic Circumpolar Current eddy saturation uses both meander and diffusivity adjustments; above it, only meanders suffice.

arxiv:2605.13895 v1 · 2026-05-12 · physics.ao-ph · physics.flu-dyn

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\pithnumber{IGHCAAYB4I6JINWOGWBX4GOCBM}

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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

When the wind strength relative to friction is below a certain threshold, eddy saturation is governed by a combination of standing meander and eddy diffusivity adjustments; once the threshold is exceeded, it is governed solely by standing meander adjustment.

C2weakest assumption

The idealized reentrant channel model captures the essential ACC dynamics, including the existence and sharpness of a drag-controlled threshold, without requiring additional real-world complexities such as variable stratification or unresolved topographic interactions.

C3one line summary

Drag strength sets a threshold that switches the dominant eddy saturation mechanism in the ACC from combined standing meander plus eddy diffusivity adjustments to standing meander adjustment alone.

References

2 extracted · 2 resolved · 0 Pith anchors

[1] C., & Hogg, A 2019 · doi:10.1175/jpo-d-17-0182.1

[2] https://doi.org/10.1175/JPO-D-20-0142.1 Large, W. G., McWilliams, J. C., & Doney, S. C. (1994). Oceanic vertical mixing: A review and a model with a nonlocal boundary layer parameterization. Reviews o 1994 · doi:10.1175/jpo-d-20-0142.1

Receipt and verification

First computed	2026-05-17T23:39:19.008134Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

418e200301e23c9436ce35837e19c20b229bfd6861fb23e379e00376cb87cbbe

Aliases

arxiv: 2605.13895 · arxiv_version: 2605.13895v1 · doi: 10.48550/arxiv.2605.13895 · pith_short_12: IGHCAAYB4I6J · pith_short_16: IGHCAAYB4I6JINWO · pith_short_8: IGHCAAYB

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/IGHCAAYB4I6JINWOGWBX4GOCBM \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 418e200301e23c9436ce35837e19c20b229bfd6861fb23e379e00376cb87cbbe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "21b439da1bea64a7e7a3419c1a23b6bc0be97553f51d0ef263968dbc03ebc817",
    "cross_cats_sorted": [
      "physics.flu-dyn"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.ao-ph",
    "submitted_at": "2026-05-12T12:09:16Z",
    "title_canon_sha256": "416757bac79cbb24b3c126f84ed973499e02a61fa23182801b0e97c6cd76e584"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13895",
    "kind": "arxiv",
    "version": 1
  }
}