プレオセノ-プレイストセノの気候移行の一環として,上流の増強
J R Marlow1, C B Lange, G Wefer
1Department of Fossil Fuels and Environmental Geochemistry, Drummond Building, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK. J.R.Marlow@ncl.ac.uk
まとめ
ベンゲラ上流系における海面温度は,過去450万年にわたって著しく低下しています. この冷却は,風による上流の増加と,海洋循環の変化と相関しています.
科学分野:
- パレオセアノグラフィー
- 気候科学 気候科学
- 海洋地質学 海洋地質学
背景:
- ベンゲラ上流系は,過去の気候動態を研究するための重要な地域です.
- 長期の海面温度 (SST) 変動の理解は,気候モデリングに不可欠です.
研究 の 目的:
- ベンゲラ上流系における450万年のSSTのタイムシリーズを再構築する.
- 寒冷化,上昇,そして地球規模の気候の変化との関係を調査する.
主な方法:
- 深海の堆積物核の分析.
- 海面温度 (SST) と古代生産性の再構築.
主要な成果:
- 地域のSSTは320万年前から約10°C減少した.
- 寒冷化に関連した風力駆動による上流の増加の証拠.
- プレオセンの中期の温暖から四季期の終わりの氷河期間の氷河期間のサイクルへのシフト.
結論:
- ベンゲラ地域は,著しい冷却を経験し,上流が強まった.
- 大西洋における海面循環は,プレオセンの中期と四次期の終わりに比べ,大西洋における海面循環は,プレオセンの中期と四次期の終わりに比べ,実質的に異なっていた.
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