Pith Number

pith:65AQO6RQ

pith:2019:65AQO6RQ2EW2M63LL4DM2DGWYL

not attested not anchored not stored refs pending

The impact of using reconditioned correlated observation error covariance matrices in the Met Office 1D-Var system

Amos S. Lawless, Fiona Smith, Jemima M. Tabeart, Joanne A. Waller, Nancy K. Nichols, Sarah L. Dance, Stefano Migliorini

arxiv:1908.04071 v1 · 2019-08-12 · physics.ao-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{65AQO6RQ2EW2M63LL4DM2DGWYL}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

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.

Receipt and verification

First computed	2026-07-05T01:12:22.051543Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f741077a30d12da67b6b5f06cd0cd6c2d81d5172b251e608bf2d486650b9febc

Aliases

arxiv: 1908.04071 · arxiv_version: 1908.04071v1 · doi: 10.48550/arxiv.1908.04071 · pith_short_12: 65AQO6RQ2EW2 · pith_short_16: 65AQO6RQ2EW2M63L · pith_short_8: 65AQO6RQ

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/65AQO6RQ2EW2M63LL4DM2DGWYL \
  | 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: f741077a30d12da67b6b5f06cd0cd6c2d81d5172b251e608bf2d486650b9febc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d7990429c8adf27d88833694c7f45f7e0e74442fe01c7e8ea06d735e7c90f154",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.ao-ph",
    "submitted_at": "2019-08-12T09:59:13Z",
    "title_canon_sha256": "cb9215d2853fd249604373e70b20bc1f8f75100f6a74edcc45598eb8e31cf21a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.04071",
    "kind": "arxiv",
    "version": 1
  }
}