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毎年解消された氷の核は,過去1800年以上の熱帯気候の変動を記録しています
L G Thompson1, E Mosley-Thompson, M E Davis
1Byrd Polar Research Center, The Ohio State University, Columbus, OH 43210, USA. thompson.3@osu.edu
まとめ
ペルーのケルカヤ氷冠からの高解像度氷芯は,1800年の熱帯気候の変動を明らかにしています. これらの記録は,酸素イソトープと海面温度と,アンモニア/ナイトレートを熱帯間の収束地帯の移動と関連付けています.
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
- 氷河学 氷河学とは
- 熱帯気候のダイナミクス
背景:
- 低緯度の氷芯は,ユニークな熱帯気候の洞察を提供しますが,稀です.
- ペルーのクエルカヤ氷河は,過去の気候の重要な,まだ未使用のアーカイブです.
研究 の 目的:
- クエルカヤ氷河から過去1800年の気候の変動を高解像度で再構築する.
- アイスコアのプロキシデータを熱帯アンデスと太平洋の特定の気候ドライバーとリンクする.
主な方法:
- クエルカヤの毎年解消した氷芯記録の分析.
- 海面温度再構築のための酸素同位体比 (δ(18) O) の測定.
- 熱帯間の収束地帯 (ITCZ) への移住を追跡するために,アンモニアムと窒素酸塩濃度の定量化.
主要な成果:
- 氷芯は,年間解像度を持つ1800年の気候変動の記録を提供します.
- 酸素の同位体は,熱帯の東太平洋の海面温度と相関しています.
- アンモニアと窒素酸塩の濃度は,ITCZが熱帯アンデス山脈に移動する際の大きな影響を反映しています.
結論:
- クエルカヤの氷冠は,熱帯気候の長期的な動態を理解するための重要なアーカイブとして機能しています.
- 過去のITCZの移動パターンは,氷のコア記録に明確に記録されています.
- 氷冠の現在の後退は,少なくとも6000年ぶりの縮小を示唆しています.
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