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Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
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将来の降水量の変化に関する新たな制約
Hideo Shiogama1, Masahiro Watanabe2, Hyungjun Kim3,4,5
1Earth System Division, National Institute for Environmental Studies, Tsukuba, Japan. shiogama.hideo@nies.go.jp.
Nature
|February 24, 2022
まとめ
将来の気候モデルでは,世界の降水変化 (ΔP) の予測の不確実性が減少していることが示されています. 最近の傾向を分析することで,科学者は降雨予測を制限し,影響評価のためにより信頼できるデータを提供しました.
科学分野:
- 気候科学
- 地球システムモデリング
- 大気科学
背景:
- 世界の平均降水変化 (ΔP) の予測は,世界の平均気温変化 (ΔT) よりも高い不確実性を表しています.
- ΔPの観察上の制約は,しばしばエアロゾールの影響によって複雑にされ,ΔTよりも研究されていない.
- 現存する地球システムモデルは,将来の降水予測において大きな変動を示している.
研究 の 目的:
- 観測上の制約を用いて,将来の地球規模の降水変化 (ΔP) の予測における不確実性を減らす.
- 温室効果ガスのシナリオで ΔP の信頼性の高い範囲を確立する.
- 影響評価のための気候モデルの出力の精度を向上させる.
主な方法:
- クープリングモデル相互比較プロジェクト第5段階と第6段階のアンサンブルを使用した.
- ΔP (2051-2100) と最近の世界の平均気温の傾向 (1980年以降) の相関を分析した.
- 熱帯地域を除いて,最近の降水傾向と ΔP の間の相関を調べた.
主要な成果:
- 温室効果ガスの予測の上限は6.2%から5.2-5.7%に低下した.
- 2051年から2100年の ΔP は,1980年以降の世界の平均気温の動向と有意な相関を示した.
- 観測上の制約と最近の傾向に基づいて,ΔPのバリエンスが8~30%減少した.
結論:
- 観測的に制約された ΔP 範囲は,将来の降水変化のより信頼できる見積もりを提供します.
- この研究は,気候モデルの降雨予測の不確実性を成功裏に減少させました.
- 改善された ΔP 予測は,気候変動の影響評価の正確さを高めます.
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