まとめ
大西洋の栄養ラインの深さの気候制御は,植物プランクトン Florisphaera profunda.と関連しています. その豊富さの変動は,幾千年にもわたって軌道内太陽化と熱帯の東風の影響を受けたニュートリックラインの深さ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
- 海洋植物プランクトン生態学 海洋植物プランクトン生態学
- 気候変動のダイナミクス
背景:
- 赤道の大西洋のニュートリックラインの深さは,海洋生態系に影響を与えます.
- Florisphaera profundaの豊富さは,栄養ラインの深さの潜在的指標である.
- 以前の研究では,気候と栄養素の変動との関連が示唆されています.
研究 の 目的:
- Florisphaera profundaの豊富さと栄養素の深さの間の長期的な関係を調査する.
- 大西洋の気候とニュートリックラインの動態に対する軌道の太陽照射の影響を決定する.
- 赤道の大西洋における過去の気候の変動を再構築する.
主な方法:
- F. profunda の相対的な豊富さの20万年の深海のコア記録の分析.
- 動物プランクトン種から得られた海面温度データによるクロススペクトル分析.
- F. profundaのサイクルと地球の軌道におけるプレセッショナルサイクルとの相関.
主要な成果:
- 20万年の記録は,F. profundaのバリエーションが2万3千年のプレセシオン帯を中心に示しています.
- F. profundaのサイクルは一貫しており,海面の温度サイクルと相関しています.
- 豊富さの変動は,近日期 (十二月と六月) のタイミングと相関しています.
結論:
- 赤道の大西洋のニュートリックラインの深さは,熱帯の東洋風の変動によって制御されます.
- これらの変動は,軌道内照射の precessional コンポーネントによって強制されます.
- ニュートリックライン深さの気候制御は,10,000年以上の時間スケールで動作します.
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