1,470年の氷河期気候周期の太陽起源の可能性は,カップリングモデルで実証されました
Holger Braun1, Marcus Christl, Stefan Rahmstorf
1Heidelberg Academy of Sciences, c/o Institute of Environmental Physics, University of Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany. holger.braun@iup.uni-heidelberg.de
Nature
|November 11, 2005
まとめ
Dansgaard-Oeschger事件として知られる急速な気候変動は,最後の氷河期中に1,470年ごとに発生しました. これらの気候サイクルは,1,470年の太陽サイクルの欠如にもかかわらず,太陽の強制によって引き起こされた可能性が高い.
科学分野:
- 古代気候学 (Paleoclimatology) とは,古代気候学 (Paleoclimatology) とは,古代気候学 (Paleoclimatology) とは,古代気候学 (Paleoclimatology) とは,古代気候学 (Paleoclimatology) とは,古代気候学 (Paleoclimatology) とは,古代気候学 (Paleo-
- 気候のダイナミクス
- ソーラーフォースリング (Solar Forcing) とは
背景:
- 北大西洋の古気候記録は,ダンズガード-オシュガー現象と呼ばれる急速な気候の振動を明らかにし,氷河期末期には約1,470年の周期性があります.
- これらの事象に関する仮説には,内部気候システムの振動と外部の太陽力強引が含まれていますが,1,470年の太陽周期は検出されていません.
研究 の 目的:
- Dansgaard-Oeschgerイベントの約1,470年の周期性を説明するために太陽の強制の可能性を調査する.
- 気候モデルを使用して,氷河の急速な気候変化の背後にあるメカニズムを探求する.
主な方法:
- 氷河条件下での中間複雑性の気候モデルを使用しました.
- モデルを北大西洋に定期的に淡水が入って,太陽の87年~210年周期をシミュレートするように強制した.
主要な成果:
- このモデルは,1,470年の間隔でダンズガード-オシュガー現象と同様の急速な気候変化をシミュレートすることに成功しました.
- 1,470年の周期性は,非線形動力学と熱ハリン循環と相互作用するより短い太陽周期の重組の結果である.
- これらの出来事はホロセンの条件では再現されませんでした.
結論:
- 氷河期の1470年の気候サイクルは,直接の1470年の太陽サイクルがなくても,太陽の強制によって引き起こされる可能性があります.
- 複数の太陽周期と気候システムの固有の非線形性の相互作用は,これらの長期的な気候パターンを生成するために不可欠です.
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