米国5大港湾における港湾混雑・運航モード・待機排出の17年間船舶レベルデータセット（2009-2025年）

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:港湾混雑と排出の因果・時系列分析に使える長期船舶レベルデータの設計と検証手法を学べる。

🏢実務担当者:海上物流のScope 3排出推計や港湾混雑リスク評価の基礎データとして活用可能。

🏛政策担当者:港湾待機排出の削減政策や排出インベントリ整備の根拠データとして参照できる。

Version 2.1.0 is complete in itself: every file from earlier versions is present, unchanged or superseded. What changed in 2.1.0. Two files are added: monthly_dwell_canonical_2015_2025.csv and monthly_dwell_canonical_2009_2014.csv , the port-month dwell metrics of the canonical census built directly from the daily national files. The LA/LB dwell series in analysis_dataset_dwell.csv and the cross-port difference test of the companion analysis are built from this census; version 2.0.0 carried only the mode-annotated census, which differs from it in 84 of 660 port-months for 2015-2025 (the 2009-2014 values are identical). The README's ping total is corrected from the pre-recovery 209.5 million to 213,663,455. No other file changed. What changed in 2.0.0. (1) Census coverage completed to 204/204 port-months. Four months (2020-07, 2020-08, 2023-03, 2023-04) were absent from v1 because of a source-retrieval failure; the 123 NOAA source days were re-acquired and re-processed through the identical pipeline, geometry and mode schema. 17-year LA/LB anchorage totals rise about 2% (CO2 2.82 -> 2.88 Mt; NOx 56,400 -> 57,564 t; PM2.5 1,505 -> 1,535 t; congested ship-days 76,966 -> 78,618). All 2021 values are unchanged, so the headline 3.3x activity ratio and social-cost figures are unaffected. (2) GSCPI month alignment corrected. In v1 the gscpi column of analysis_dataset_dwell.csv was labelled one month late (the NY Fed workbook is month-end dated and had been normalised with an offset that rolls forward), so the panel satisfied gscpi[t] = GSCPI_true[t-1] for all 297 months. Correcting this strengthens the published relationship (dwell-GSCPI r 0.45 -> 0.51). Users who ran analyses on the v1 panel should re-run them against this file. No other column changed. Superseded files: port_pings.zip (128 -> 132 partitions), monthly_mode_time_2015_2025.csv, analysis_dataset_dwell.csv, emissions_carb_calibrated_LA.csv, README.md. The other eight files are byte-identical to v1.0.0. Daily-census, vessel-level record of cargo/tanker dwell time at five US port complexes (Los Angeles/Long Beach, New York/New Jersey, Houston, Savannah, Seattle), 2009-2025, from terrestrial AIS (213,663,455 in-port position reports). Three products: (i) monthly per-port dwell metrics (1,016 port-months); (ii) per-vessel operational-mode hours - anchor/berth/manoeuvre/transit via NOAA charted anchorage areas (273,281 vessel-months); (iii) a CARB-calibrated idling-emissions layer (CO2/NOx/PM2.5) for LA/Long Beach. Internally validated against a verified 2022 benchmark; externally corroborated vs the NY Fed GSCPI and CARB; era-seam and emission cross-checks documented. Companion papers: Communications Earth & Environment (analysis) and Scientific Data (descriptor). Report emissions as relative change; absolute CO2 intensity is method-dependent (band 24-69 t/ship-day).

• Zenodo https://zenodo.org/records/23943677first seen 2026-11-06 04:11:40