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プレイストセンの終わりの氷河期における半球間相関
まとめ
最後の氷河期におけるアンデス山脈とニュージーランドにおける氷河の進出は,同期した気候変化を明らかにしている. 地域的な海流ではなく,これらの地球規模の大気の変化が,氷河期の終焉を引き起こした.
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
- 氷河学 氷河学とは
- 気候科学 気候科学
背景:
- 放射性炭素年代測定により,チリのアンデス山脈とニュージーランドの南アルプスの氷河期最大値が明らかになりました.
- これらの氷河現象は,寒く湿った亜南極公園地帯の環境の中で起こった.
- 最後の氷河期の終わりには,巨大な氷葉が崩壊し,植生が変化した.
研究 の 目的:
- チリのアンデス山脈とニュージーランドにおける氷河の進出に関する放射性炭素年代測定を確立する.
- 最後の氷河期における氷河の最大値のタイミングと範囲を調査する.
- 半球間気候カップリングとその要因を探求する.
主な方法:
- 放射性炭素 (炭素-14) による地質学的記録の年代測定.
- 北大西洋におけるラフティングパルスの分析.
- 氷河期の相関関係と古海洋学的データ.
主要な成果:
- チリアンデスで,現在より約14,000~33,500年前の炭素-14年間で,複数の氷河期最大値が確認された.
- 氷河の最大値はニュージーランドでも記録されており,その中には若いドライアスの始まり (現在より約11,050年前の炭素-14) の1つも含まれています.
- これらの氷河現象は北大西洋のラフト氷のパルスと一致し,両半球の最後の終点への同時開始と一致しました.
結論:
- 南半球における氷河の最大値は,北大西洋の出来事と同時期であり,地球規模の気候変動を促すことを示唆している.
- 最後の氷河期の同期的な終結は,地球規模の大気信号を暗示しています.
- 半球間気候の結合は,北大西洋の熱ハリン循環や氷床の動態だけでなく,地球規模の大気プロセスによって引き起こされた.
関連する概念動画
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Correlation
In statistics, two variables are said to be correlated if the values of one variable are associated with the other variable. Depending on the relationship between two variables, correlation can be of three types– positive correlation, negative correlation, and zero correlation.
Two variables, for example, a and b, are said to be positively correlated if both variables move in the same direction. In other words, a positive correlation exists between two variables, a and b, if:
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