オーバーシュート積分は1.5°C超の温暖化における気候科学と政策に示唆を与える
The overshoot integral can inform climate science and policy beyond 1.5°C of warming (原題)
James G. Dyke, Jesse F. Abrams, J. Schellnhuber
🤖 gxceed AI 要約
日本語
炭素予算に代わる補完的指標として「オーバーシュート積分」（閾値超過温度の時間積分、°C·年）を提案。ピーク温度が同程度でも累積熱曝露は2桁以上異なりうることを示す。サンゴ・永久凍土・山岳氷河の影響予測では、ピーク温度のみより累積曝露を加えた単純リスク式が予測精度を改善する。
English
The authors propose the 'overshoot integral'—time-integrated temperature exceedance above a threshold (°C·years)—as a complement to the carbon budget framework. Pathways with similar peak warming can differ by over two orders of magnitude in cumulative thermal exposure. For marine habitat, permafrost carbon and mountain glaciers, combining peak and cumulative exposure improves out-of-sample prediction, framing overshoot as cumulative dose rather than a reversible account.
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
SSBJ・有報の気候シナリオ分析では、ピーク温度のみに依拠したリスク評価の限界を示唆する。長期シナリオの物理リスク評価を精緻化する際の理論的裏付けとなりうる。
In the global GX context
Relevant to TCFD/ISSB scenario analysis: it argues physical-risk assessment should account for cumulative thermal exposure, not just peak warming, informing how transition and physical risk horizons are framed in disclosure.
👥 読者別の含意
🔬研究者:気候影響評価における累積曝露指標の有用性と、ピーク温度中心の枠組みの限界を定量化する枠組みを提供する。
🏢実務担当者:長期シナリオ分析で物理リスクをピーク温度だけで評価する限界を認識する材料になる。
🏛政策担当者:1.5°C超過が不可避な下での気候政策目標設計に、累積曝露という新たな評価軸を提示する。
📄 Abstract（原文）
The carbon budget framework has served as the dominant organising principle for climate science and policy, linking cumulative emissions to peak warming and providing a tractable scalar constraint for international negotiations. With 1.5°C exceedance now imminent and virtually all mitigation scenarios involving substantial temperature overshoot before net-negative emissions could return temperatures to target, the budget framework's utility for evaluating and minimising risk generated by warming risks becoming diminished. We propose a complementary organising principle: the overshoot integral, defined as the time-integrated temperature exceedance above a policy-relevant threshold, with units of °C·years. Analogous to degree-heating weeks in coral bleaching prediction and positive degree-days in glaciology, the overshoot integral captures both the magnitude and duration of exceedance in a single scalar quantity. Applying this metric to future climate pathways, we show that pathways with similar peak temperatures can differ by more than two orders of magnitude in their cumulative degree-year burden. Applied to CMIP7 ScenarioMIP/FaIR (Finite Amplitude Impulse Response simple climate model) trajectories, calculating overshoot integrals reveal substantial differences in cumulative thermal exposure across pathways. For Earth-system impacts whose response dynamics integrate forcing over time, spanning marine habitat, permafrost carbon and mountain glaciers, we show that cumulative thermal exposure captured by the overshoot integral contains impact-relevant information not captured by peak warming alone. A simple risk formulation combining peak and cumulative exposure improves out-of-sample prediction across all three systems. That the overshoot integral is best understood not as a reversible account that can be debited and credited, but as a cumulative dose should inform climate policy and science in the increasingly warmer future.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1088/1748-9326/aeb55afirst seen 2026-10-21 05:31:59 · last seen 2026-11-06 05:44:34
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