Subsoil acidity causes long delays in inorganic carbon sequestration by Enhanced Weathering
亜表層酸性度が促進風化による無機炭素隔離に長い遅延を引き起こす (AI 翻訳)
Søren Jessen, Rasmus Jakobsen, Majken Looms, Per Ambus, Dieke Postma
🤖 gxceed AI 要約
日本語
促進風化(EW)によるCO2除去の実効性評価において、亜表層の酸性度が重要な遅延要因となることを実証。百年規模の農業石灰施用をプロキシとした現地調査で、表層で生成されたアルカリ度が厚さ5mの酸性不飽和帯を浸透し地下水面に達するには30〜100年を要することが判明。EWの短期炭素回収戦略としての有効性に疑問を投げかける。
English
This study provides empirical evidence that subsoil acidity can cause substantial delays in inorganic carbon sequestration by Enhanced Weathering (EW). Using century-long agricultural liming as a proxy, it shows that alkalinity from the topsoil takes 30–100 years to penetrate a 5 m acidic unsaturated zone and reach the water table. The findings question the viability of EW as a short-term carbon capture strategy and emphasize the need for site-specific assessments of subsoil buffering capacity.
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CCUS戦略においても、促進風化（EW）は注目されているが、土壌酸性度の影響評価が重要であることを示唆。特に日本の火山灰土壌や酸性土壌地域では、亜表層の緩衝能を事前評価せずにEWを展開すると、効果発現に数十年の遅延が生じる可能性がある。
In the global GX context
Globally, Enhanced Weathering is promoted as a scalable carbon dioxide removal (CDR) technology. This study underscores a critical but often overlooked barrier: subsoil acidity can delay carbon sequestration by decades, making EW unsuitable for near-term climate targets. It calls for rigorous geochemical characterization before deploying EW projects, informing both corporate CDR procurement and national carbon accounting frameworks under the Paris Agreement.
👥 読者別の含意
🔬研究者:Provides empirical constraints for biogeochemical models of Enhanced Weathering, highlighting subsoil buffering as a key parameter for CDR timing estimates.
🏢実務担当者:Companies planning EW projects must assess subsoil acidity to avoid unrealistic carbon credit timelines; multiple decades of delay may affect project viability.
🏛政策担当者:National CDR strategies should account for subsoil-imposed delays when setting targets for short-term carbon removal; EW may not deliver quick results.
📄 Abstract（原文）
While a looming atmospheric CO$_2$ overshoot calls for immediate carbon sequestration, delays associated to Enhanced Weathering (EW) carbon dioxide removal are being investigated. Topsoil acidity is already known to delay EW carbon sequestration, but subsoil acidity remains underexplored. Using century-long agricultural liming of formerly acidic heathland as a proxy for EW, this study provides empirical evidence of subsoil-imposed delays. Below such limed terrain, we observed a downward-progressing front of topsoil-produced alkalinity that still requires 30-100 years to penetrate the approximately 5 m thick acidic sandy unsaturated zone and reach the groundwater table. Subsoil acidity thus may cause beyond-reasonable delays, prohibiting EW as a viable short-term carbon capture strategy even on topsoils made non-acidic by preceding liming. When planning EW schemes, the amounts of stored acidic cations in top- and subsoil, as well as the rate and composition of infiltrating water, controlling the duration of the delay, require careful assessment.
🔗 Provenance — このレコードを発見したソース
- arXiv https://arxiv.org/abs/2607.01835first seen 2026-07-03 04:12:21
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