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太陽の変動とオマンのモンスーンとの間に強い相関性があり,これは9~6万年前である
1Heidelberg Academy of Sciences, Im Neuenheimer Feld 229, Heidelberg, Germany D-69120.
Nature
|May 18, 2001
まとめ
太陽放射線の変動は,熱帯の降雨量とモンスーンの強さに,百年から十年までのスケールで大きな影響を及ぼしました. この研究は,スタラグミットの酸素同位体を使用して,オマンの古代気候変化と太陽活動の変化を関連付けています.
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
- 地質化学 地質化学
背景:
- 太陽放射線の変動が地球の気候に影響を及ぼすと仮定されていますが,千年から十年までの時間スケールへの影響は不明です.
- 過去の気候記録は,太陽のサイクルとの相関を示しているが,絶対的な太陽の強度の変化は小さいし,太陽流動の影響はよく確立されていない.
- オマンのスタラグミット形成は,過去の熱帯間の収束地帯 (ITCZ) のシフトの記録を提供します.
研究 の 目的:
- 過去の熱帯循環とモンスーン降雨の変動を,高解像度のスタラガミット酸素同位体記録を使用して再構築する.
- 酸素同位体記録を樹輪放射性炭素データ,太陽活動のためのプロキシと比較するために.
- 太陽放射線の変動と,熱帯の100年~10年規模の気候変動との関係を調査する.
主な方法:
- オマンの北部のTh-U年代スタラガミットにおける酸素同位体変異 (デルタ18O) の分析.
- トリウム・ウラン (Th-U) 方法によるスタラガミットの高解像度年代測定.
- スタラガミットのデルタ18O記録と,木の輪から得られたデルタ14C記録の比較.
主要な成果:
- 現在の9.6から6.1kyrをカバーする高解像度の酸素同位体記録は,オマンのスタラガミットから確立されました.
- 熱帯循環とモンスーンの降雨を反映したデルタ18O記録は,樹輪からのデルタ14C記録と優れた相関を示しました.
- この相関は,太陽放射線の変動が,熱帯雨量とモンスーンの強さの百年から十年スケールの変化の主な原動力であったことを示唆しています.
結論:
- 太陽放射線の変動は,研究期間 (9.6-6.1 kyr BP) の間,百年から十年までの時間スケールで熱帯雨量とモンスーンの強さを制御する主要な要因でした.
- オマーン・スタラガミットは,過去の太陽と気候のつながりを再構築するための貴重な代理物を提供します.
- この研究は,太陽が地域の気候パターンに及ぼす影響の理解を強化します.
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