{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:MRR62VD7GNU44WULGMQUHAOKHC","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":"8d5c7297d40ee78cd45e4c2ecf09747971e922069c5aa4e804b9fdc7f0aa8c29","cross_cats_sorted":["physics.ao-ph","physics.geo-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2012-09-19T22:06:49Z","title_canon_sha256":"27ecb9973a825187b554d384edcde600fe54f53462e00357fca9b4bdeef6fe12"},"schema_version":"1.0","source":{"id":"1209.4381","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.4381","created_at":"2026-05-18T03:45:11Z"},{"alias_kind":"arxiv_version","alias_value":"1209.4381v1","created_at":"2026-05-18T03:45:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.4381","created_at":"2026-05-18T03:45:11Z"},{"alias_kind":"pith_short_12","alias_value":"MRR62VD7GNU4","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"MRR62VD7GNU44WUL","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"MRR62VD7","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:b1065da654ff0b81e4a1092154c3cce3bffc3459a5b3079b1d9a060451d4db77","target":"graph","created_at":"2026-05-18T03:45:11Z","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":"We do a preliminary modelling of the photosynthetic rates of phytoplankton at the very beginning of the Paleogene, just after the impact of the Chicxulub asteroid, which decisively contributed to the last known mass extinction of the Phanerozoic eon. We assume the worst possible scenario from the photobiological point of view: an already clear atmosphere with no ozone, as the timescale for soot and dust settling (years) is smaller than that of the full ozone regeneration (decades). Even in these conditions we show that most phytoplankton species would have had reasonable potential for photosyn","authors_text":"Noel Perez, Osmel Martin, Reinaldo Rojas, Rolando Cardenas","cross_cats":["physics.ao-ph","physics.geo-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2012-09-19T22:06:49Z","title":"Modeling the onset of photosynthesis after the Chicxulub asteroid impact"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.4381","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":"sha256:2d64460189d5b64684590fbc0c437fb40fe0b6ec13e160167b7b8ce631b5cbfb","target":"record","created_at":"2026-05-18T03:45:11Z","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":"8d5c7297d40ee78cd45e4c2ecf09747971e922069c5aa4e804b9fdc7f0aa8c29","cross_cats_sorted":["physics.ao-ph","physics.geo-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2012-09-19T22:06:49Z","title_canon_sha256":"27ecb9973a825187b554d384edcde600fe54f53462e00357fca9b4bdeef6fe12"},"schema_version":"1.0","source":{"id":"1209.4381","kind":"arxiv","version":1}},"canonical_sha256":"6463ed547f3369ce5a8b33214381ca38a82f7678ffb97a29b1506348e05f8635","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6463ed547f3369ce5a8b33214381ca38a82f7678ffb97a29b1506348e05f8635","first_computed_at":"2026-05-18T03:45:11.881382Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:45:11.881382Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OqV1IfFMr4p2IGBMZf0CJOk4yMZvxURw7YoAP/E9del3fZMA5cB5zRn6JYVe8EPBDRG8/jvVRxcBWSyTW5keBw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:45:11.881901Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.4381","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2d64460189d5b64684590fbc0c437fb40fe0b6ec13e160167b7b8ce631b5cbfb","sha256:b1065da654ff0b81e4a1092154c3cce3bffc3459a5b3079b1d9a060451d4db77"],"state_sha256":"6255231ba567ad18f87bda007c867b38d79a82fc4362717b8a0ee33d2f6e7dee"}