Arctic condensed aromatic carbon budget reveals efficient fluvial transfer and shelf storage
北極圏の縮合芳香族炭素収支が明らかにする効率的な河川輸送と陸棚貯留 (AI 翻訳)
Schwab M, Coppola A, Gerrevink Mv, Bertin C, Haghipour N, Galy V, Hilton R, Jones M, Veraverbeke S, Eglinton T
🤖 gxceed AI 要約
日本語
本研究は、マッケンジー川–ボーフォート海系における縮合芳香族炭素（ConAC）の発生源から堆積までの収支を定量化した。山火事により36.5 TgのConACが生成されたが、河川による海洋への流出量は年間0.42 Tgと比較的少なく、陸棚への堆積は年間0.14 Tgであった。流域の岩質や堆積物トラップなどの特性がConACの輸送と貯留を制御していることを明らかにし、気候変動下での高緯度炭素循環の変化を評価するための定量的基盤を提供する。
English
This study presents a comprehensive source-to-sink budget for condensed aromatic carbon (ConAC) in the Mackenzie River–Beaufort Sea system. Wildfires produced 36.5 Tg ConAC, but fluvial export averaged only 0.42 Tg yr⁻¹, with shelf accumulation of 0.14 Tg yr⁻¹. The budget shows that basin properties like lithology and sediment trapping dominate ConAC transport and storage. It establishes a quantitative baseline for assessing future environmental changes on Arctic carbon cycling.
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
この論文は自然炭素循環の研究であり、日本のGX政策や企業開示に直接関連するものではない。しかし、自然由来の炭素収支を詳細に定量化する手法は、日本の環境影響評価や国際的な気候モデルにおける炭素循環の理解に貢献し得る。特に、森林火災が炭素循環に与える影響の評価に応用可能な枠組みを提供している。
In the global GX context
This paper is a detailed case study on natural carbon cycling in the Arctic, not directly tied to corporate GHG accounting or disclosure frameworks. However, its rigorous mass balance approach for pyrogenic carbon is relevant for global carbon budget modeling and climate policy. The findings highlight the importance of considering landscape-scale processes in carbon cycling, which can inform national greenhouse gas inventories and land-use change assessments.
👥 読者別の含意
🔬研究者:Provides a comprehensive budget for an important but poorly constrained carbon fraction, offering methods transferable to other high-latitude or fire-prone systems.
📄 Abstract（原文）
<title>Abstract</title> <p> Arctic–Boreal ecosystems hold vast carbon stocks, yet intensifying wildfires threaten to shift them from net sinks to net sources. Fires produce condensed aromatic carbon (ConAC), a chemically stable form of pyrogenic carbon that accumulates in terrestrial and marine reservoirs. However, ConAC mobilization, retention, and export along the riverine continuum remain poorly constrained. Here, we present a comprehensive source-to-sink ConAC budget for the Mackenzie River–Beaufort Sea system, quantifying wildfire production, riverine transport, and shelf accumulation. Between 2001 and 2017, fires burned 9.7% of the basin and generated 36.5 Tg ConAC, while soils stored ~4 Pg ConAC with millennial-scale turnover. Fluvial export averaged 0.42 Tg ConAC yr <sup>–1</sup> . The dissolved fraction reflected modern pyrogenic sources, in contrast to particulate ConAC dominated by radiocarbon-depleted carbon derived from sedimentary rocks. On the Beaufort Shelf, waters retained ~1.2 Tg ConAC with a ~6-year residence time, whereas sediments accumulated ~0.14 Tg ConAC yr <sup>–1</sup> . This budget reveals that basin properties including lithology, geomorphic routing, and sediment trapping control the composition and efficiency of land-to-ocean ConAC transfer. It establishes a quantitative baseline for assessing how ongoing environmental change will reshape ConAC cycling across high-latitude systems. </p>
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.21203/rs.3.rs-9476681/v1first seen 2026-05-14 21:19:58
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