{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:PT4QVBL76CCKBRYGO4SEAUZX4Q","short_pith_number":"pith:PT4QVBL7","canonical_record":{"source":{"id":"chao-dyn/9812024","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"chao-dyn","submitted_at":"1998-12-16T17:39:01Z","cross_cats_sorted":["nlin.CD","physics.ao-ph"],"title_canon_sha256":"1c9d05551c15e09050e446fa8946df2b1f9df93ff113362e6be82c51e657b29d","abstract_canon_sha256":"011e09ab8ce86bb45ecc1ae6153f2a399ef58659062a1a7ac792854dbfa89aca"},"schema_version":"1.0"},"canonical_sha256":"7cf90a857ff084a0c7067724405337e41980cdf38f3491d944a0063430126b63","source":{"kind":"arxiv","id":"chao-dyn/9812024","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"chao-dyn/9812024","created_at":"2026-05-18T01:40:11Z"},{"alias_kind":"arxiv_version","alias_value":"chao-dyn/9812024v1","created_at":"2026-05-18T01:40:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.chao-dyn/9812024","created_at":"2026-05-18T01:40:11Z"},{"alias_kind":"pith_short_12","alias_value":"PT4QVBL76CCK","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"PT4QVBL76CCKBRYG","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"PT4QVBL7","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:PT4QVBL76CCKBRYGO4SEAUZX4Q","target":"record","payload":{"canonical_record":{"source":{"id":"chao-dyn/9812024","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"chao-dyn","submitted_at":"1998-12-16T17:39:01Z","cross_cats_sorted":["nlin.CD","physics.ao-ph"],"title_canon_sha256":"1c9d05551c15e09050e446fa8946df2b1f9df93ff113362e6be82c51e657b29d","abstract_canon_sha256":"011e09ab8ce86bb45ecc1ae6153f2a399ef58659062a1a7ac792854dbfa89aca"},"schema_version":"1.0"},"canonical_sha256":"7cf90a857ff084a0c7067724405337e41980cdf38f3491d944a0063430126b63","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:11.495725Z","signature_b64":"YdWjY+TVZbh3dEnR78cglst6l6UicqmPfY8ubjlCLZDuK2dv/KmgWVjAqgs6ByuKt3On/ol/jgkAj3H1fEMhAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7cf90a857ff084a0c7067724405337e41980cdf38f3491d944a0063430126b63","last_reissued_at":"2026-05-18T01:40:11.495084Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:11.495084Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"chao-dyn/9812024","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:40:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"emumuJw9fmE59F48zvCva5C1RDo63ug+2kPpeY8yU0a1s2Zs/D4OSIMMi5ccoEx6XP7kguS056Xl7OMkvZU6AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T17:56:52.325434Z"},"content_sha256":"d65a85af9ebd0ab4e107da42dacc4f3f41fd4b7d2711c41528fe9ff78fa3dd07","schema_version":"1.0","event_id":"sha256:d65a85af9ebd0ab4e107da42dacc4f3f41fd4b7d2711c41528fe9ff78fa3dd07"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:PT4QVBL76CCKBRYGO4SEAUZX4Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The dynamics of a low-order coupled ocean-atmosphere model","license":"","headline":"","cross_cats":["nlin.CD","physics.ao-ph"],"primary_cat":"chao-dyn","authors_text":"F. Verhulst, L. van Veen, T. Opsteegh","submitted_at":"1998-12-16T17:39:01Z","abstract_excerpt":"A system of five ordinary differential equations is studied which combines the Lorenz-84 model for the atmosphere and a box model for the ocean. The behaviour of this system is studied as a function of the coupling parameters. For most parameter values, the dynamics of the atmosphere model is dominant. For a range of parameter values, competing attractors exist. The Kaplan-Yorke dimension and the correlation dimension of the chaotic attractor are numerically calculated and compared to the values found in the uncoupled Lorenz model. In the transition from periodic behaviour to chaos intermitten"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"chao-dyn/9812024","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:40:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I50wvVyIMwaPGvGzLRqXN7GwyE2OTXUXjLQkTT0h6rk52KCsPUGOiZSEH1I8LFqHiu26OwdmAQup2Fjv5DP4Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T17:56:52.325772Z"},"content_sha256":"c4f4692d69cf1341ac430c9919e6c30da3cd9da8e9699a4328707b6fca8346e9","schema_version":"1.0","event_id":"sha256:c4f4692d69cf1341ac430c9919e6c30da3cd9da8e9699a4328707b6fca8346e9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PT4QVBL76CCKBRYGO4SEAUZX4Q/bundle.json","state_url":"https://pith.science/pith/PT4QVBL76CCKBRYGO4SEAUZX4Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PT4QVBL76CCKBRYGO4SEAUZX4Q/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-27T17:56:52Z","links":{"resolver":"https://pith.science/pith/PT4QVBL76CCKBRYGO4SEAUZX4Q","bundle":"https://pith.science/pith/PT4QVBL76CCKBRYGO4SEAUZX4Q/bundle.json","state":"https://pith.science/pith/PT4QVBL76CCKBRYGO4SEAUZX4Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PT4QVBL76CCKBRYGO4SEAUZX4Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:PT4QVBL76CCKBRYGO4SEAUZX4Q","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"011e09ab8ce86bb45ecc1ae6153f2a399ef58659062a1a7ac792854dbfa89aca","cross_cats_sorted":["nlin.CD","physics.ao-ph"],"license":"","primary_cat":"chao-dyn","submitted_at":"1998-12-16T17:39:01Z","title_canon_sha256":"1c9d05551c15e09050e446fa8946df2b1f9df93ff113362e6be82c51e657b29d"},"schema_version":"1.0","source":{"id":"chao-dyn/9812024","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"chao-dyn/9812024","created_at":"2026-05-18T01:40:11Z"},{"alias_kind":"arxiv_version","alias_value":"chao-dyn/9812024v1","created_at":"2026-05-18T01:40:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.chao-dyn/9812024","created_at":"2026-05-18T01:40:11Z"},{"alias_kind":"pith_short_12","alias_value":"PT4QVBL76CCK","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"PT4QVBL76CCKBRYG","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"PT4QVBL7","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:c4f4692d69cf1341ac430c9919e6c30da3cd9da8e9699a4328707b6fca8346e9","target":"graph","created_at":"2026-05-18T01:40:11Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"A system of five ordinary differential equations is studied which combines the Lorenz-84 model for the atmosphere and a box model for the ocean. The behaviour of this system is studied as a function of the coupling parameters. For most parameter values, the dynamics of the atmosphere model is dominant. For a range of parameter values, competing attractors exist. The Kaplan-Yorke dimension and the correlation dimension of the chaotic attractor are numerically calculated and compared to the values found in the uncoupled Lorenz model. In the transition from periodic behaviour to chaos intermitten","authors_text":"F. Verhulst, L. van Veen, T. Opsteegh","cross_cats":["nlin.CD","physics.ao-ph"],"headline":"","license":"","primary_cat":"chao-dyn","submitted_at":"1998-12-16T17:39:01Z","title":"The dynamics of a low-order coupled ocean-atmosphere model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"chao-dyn/9812024","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:d65a85af9ebd0ab4e107da42dacc4f3f41fd4b7d2711c41528fe9ff78fa3dd07","target":"record","created_at":"2026-05-18T01:40:11Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"011e09ab8ce86bb45ecc1ae6153f2a399ef58659062a1a7ac792854dbfa89aca","cross_cats_sorted":["nlin.CD","physics.ao-ph"],"license":"","primary_cat":"chao-dyn","submitted_at":"1998-12-16T17:39:01Z","title_canon_sha256":"1c9d05551c15e09050e446fa8946df2b1f9df93ff113362e6be82c51e657b29d"},"schema_version":"1.0","source":{"id":"chao-dyn/9812024","kind":"arxiv","version":1}},"canonical_sha256":"7cf90a857ff084a0c7067724405337e41980cdf38f3491d944a0063430126b63","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7cf90a857ff084a0c7067724405337e41980cdf38f3491d944a0063430126b63","first_computed_at":"2026-05-18T01:40:11.495084Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:40:11.495084Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"YdWjY+TVZbh3dEnR78cglst6l6UicqmPfY8ubjlCLZDuK2dv/KmgWVjAqgs6ByuKt3On/ol/jgkAj3H1fEMhAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:40:11.495725Z","signed_message":"canonical_sha256_bytes"},"source_id":"chao-dyn/9812024","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d65a85af9ebd0ab4e107da42dacc4f3f41fd4b7d2711c41528fe9ff78fa3dd07","sha256:c4f4692d69cf1341ac430c9919e6c30da3cd9da8e9699a4328707b6fca8346e9"],"state_sha256":"df520a965184843e413bd0b419132ae20bc77948701ad1ee93b1d8ab390697ea"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8EvaB051zqLlzNeBAZyCexXgxNcPEeYnLigkZdyS58hDp3CcXg2qR0AQgquWDo6Rz8YYahzgT9uH1F78plFoCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T17:56:52.327667Z","bundle_sha256":"64afebd4af8927970c113224317e238eb7adbb12ab909b26653aa48fb1307df0"}}