軌道時間スケールにおける南極の温度と局所的な太陽照射の同期性
Thomas Laepple1, Martin Werner, Gerrit Lohmann
1Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany. thomas.laepple@awi.de
Nature
|March 4, 2011
まとめ
南極の氷芯データは,ミランコビッチ理論を支持しないかもしれない. 雪積みの季節的なバイアスは,北半球の気候ではなく,地元の日照が,南極の気温変化を説明できることを意味します.
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
- 気候科学 気候科学
- 地質物理学 地質物理学とは地質物理学です.
背景:
- ミランコビッチ理論は,北半球の夏の太陽熱が軌道時間スケールにおける地球気候の変動を誘発すると仮定している.
- 南極の気温記録は,北極の夏の太陽照射とほぼ同期しており,証拠として引用されています.
- 北半球の太陽照射と南極の気候を結びつける直接的なメカニズムが欠けています.
研究 の 目的:
- 南極氷の核心温度記録の解釈を再評価する.
- 南極の気候再構築における潜在的なバイアスを調査するために.
- 地元の日焼けが南極の気温変動を説明できるかどうかを判断する.
主な方法:
- 南極の氷の核における季節的な雪積もりのバイアスを分析する.
- "レコーダー"システムにおけるバイアスの現在の推定値を利用する.
- 再構築された南極の気温を現地および北半球の太陽照射データと比較する.
主要な成果:
- 南極の氷の核の温度記録は,季節的な雪の蓄積のために,南極の冬へのバイアスを示しています.
- このバイアスは,局所的な南極の夏の太陽照射が,南極の気温の軌道成分を説明できることを意味します.
- 観測された南極の気温パターンを説明するために,北半球の気候とのリンクを主張する必要はありません.
結論:
- 南極の氷の核から派生した温度記録は,ミランコビッチ仮説を支持または反証するための信頼できる指標ではありません.
- 過去の南極の気候が北半球の太陽照射によってのみ引き起こされたという解釈は,欠陥があるかもしれません.
- 軌道時間スケールにおける半球気候の関連性を理解するためにさらなる研究が必要である.
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