化学アルベドフィードバックは,森林のCO2除去効果の最大3分の1を相殺する
James Weber1, James A King1, Nathan Luke Abraham2,3
1Leverhulme Centre for Climate Change Mitigation, School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK.
まとめ
二酸化炭素の除去のための植林は,大気ガスを変化させ,表面の反射性を減少させ,地球を温めることができます. この気候への影響は,特に野心的な温暖化目標の下では,炭素除去の利点のいくつかを相殺します.
科学分野:
- 気候科学
- 地球システムモデリング
- 大気化学
背景:
- 森林化は大気中の二酸化炭素 (CO2) を除去するための戦略です.
- 大気組成や表面アルベドの変化など,二酸化炭素収縮以外の森林化の気候への影響は十分に理解されていません.
研究 の 目的:
- 森林の広範囲拡大による気候変動の影響を評価する.
- 地球システムモデルを使用して,これらの影響を他のあり得る気候の将来と比較する.
主な方法:
- 地球規模の森林拡大シナリオをシミュレートするために 2 つの地球システムモデルを使用した.
- 森林化のシナリオと将来の気候変動のシナリオを比較した.
主要な成果:
- 森林化により,エアロゾール散布と温室効果ガス (メタン,オゾン) が増加した.
- 森林の拡大による表面アルベドの減少は,陽性放射性強制 (温暖化) を引き起こした.
- この温暖化効果は,4°Cの温暖化シナリオでは,CO2除去効果の最大33%を相殺する.
結論:
- 森林化の気候上の利点は,大気組成と表面アルベドへの影響によって部分的に減少しています.
- 2°Cのパリ協定目標を達成するために,森林化の温暖化効果は,積極的な排出量削減と組み合わせた場合,より顕著です.
- 緊急で同時に行われる排出削減は 森林伐採のような戦略とともに 気候変動を効果的に緩和するために 極めて重要です
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