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全球2km×2km低不確実性カラム平均乾燥空気メタン混合比データセット（2018-2025年）

Global 2km×2km low uncertainty column-averaged dry air mixing ratio of methane dataset (2018-2025) (原題)

Jiwei Shen, Dakang Wang

Science Data Bankデータセット2026-07-27#気候科学Origin: Global対象セクター: oil_gas
DOI: 10.57760/sciencedb.43613
原典: https://doi.org/10.57760/sciencedb.43613

🤖 gxceed AI 要約

日本語

TROPOMI衛星データから全球2km×2kmのメタン濃度データセット（TRCH4S V1.0）を開発。TCCONやGOSATとの比較で高精度を確認し、石油・ガス田などのスーパーエミッターのプルーム構造を従来の10km製品より明瞭に捉える。排出源特定や気候政策評価に貢献する。

English

A global 2km×2km methane concentration dataset (TRCH4S V1.0) derived from TROPOMI satellite data. Validated against TCCON and GOSAT, it shows high accuracy and resolves plume structures from super-emitters like oil and gas fields better than standard 10km products, aiding emission source identification and climate policy evaluation.

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

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本の温室効果ガス排出削減目標の達成状況評価や、衛星観測を活用した排出量モニタリングの高度化に資する。特に、石油・ガス田や都市部のメタン排出源の特定は、日本のエネルギー政策や国際的な気候変動交渉におけるデータ基盤として有用。

In the global GX context

This dataset enhances global methane monitoring capabilities, supporting the Global Methane Pledge and national greenhouse gas inventories. It provides a high-resolution tool for identifying emission hotspots, which is crucial for climate policy evaluation and corporate Scope 1 reporting under frameworks like TCFD and ISSB.

👥 読者別の含意

🔬研究者:Provides a high-resolution methane dataset for validating emission inventories and studying plume dynamics.

🏢実務担当者:Useful for companies in oil and gas or waste management to monitor and report methane emissions with greater precision.

🏛政策担当者:Supports evidence-based policy for methane reduction targets and international reporting obligations.

📄 Abstract（原文）

Satellite observations of tropospheric methane (CH4) are essential for identifying greenhouse gas emission sources and evaluating climate mitigation policies. TROPOMI is one of the highest resolutions (5.5km× 7km) payloads capable of daily observation of global CH4 columns to date, while the native resolution of tens of square kilometers remains falls short in capturing point sources and emission plumes at smaller scales (e.g., <10 km²). We report a global 2km×2km low uncertainty column-averaged dry air mixing ratio of methane (XCH4) dataset (2018-2025) version 1.0 (referred to as TRCH4S V1.0), produced by Level-2 TROPOMI CH4 product using our regridding algorithm, including monthly, seasonally, and annual products. TRCH4S is in good agreement with correlative measurements from the TCCON, with R=0.953 (higher than 0.78 of the L2 CH4 product), RMSE=12.39ppb, BIAS= -1.09 ± 12.36 ppb (-0.06 ± 0.66%), less than the mission requirement of 1.5% bias, and cross-validation with GOSAT observations confirms robust spatiotemporal consistency, with R=0.892 (higher than 0.83 of the L2 CH4 product), RMSE=18.93ppb, BIAS=-6.24 ± 17.88 ppb (-0.33 ± 0.95%), less than the mission requirement of 1.5% bias, demonstrating good fidelity in capturing spatial hotspots and low-concentration regions. Application examples show that TRCH4S V1.0 significantly outperforms standard 10 km aggregated products in resolving plume structures from super-emitter sources such as oil and gas fields.

🔗 Provenance — このレコードを発見したソース

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