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コメント on "サハラ砂漠における気候変動による生態系継承:過去6000年"
Victor Brovkin1, Martin Claussen
1Max Planck Institute for Meteorology, Bundesstrasse 55, 20146 Hamburg, Germany. victor.brovkin@zmaw.de
Science (New York, N.Y.)
|November 29, 2008
まとめ
新しい研究は,サハラ砂漠におけるホロセンの半ばの気候と植物のフィードバックの解釈に挑戦しています. ヨア湖からの堆積物データは,西サハラで強い陸地と大気の結合に関する以前の発見を無効にしないかもしれない.
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
- 気候モデリング
- アフリカの気候ダイナミクス
背景:
- 以前の研究では,ヨア湖の堆積物データを,ホロセンの半ばのサハラで気候と植物のフィードバックが弱い証拠として解釈した.
- この解釈は,北アフリカ中東部の堆積物記録に基づいていた.
研究 の 目的:
- ヨア湖の堆積物記録の解釈を再評価する.
- 広いサハラ地域におけるヨア湖の記録の代表性を評価する.
- ホロセンの半ばの気候と植生に関する異なる見解を調和させるため.
主な方法:
- ヨア湖からの堆積物核の分析.
- 新しいデータと既存の気候モデリングの結果を比較する.
- データの代表性の地理的および気候学的評価.
主要な成果:
- ヨア湖の堆積物記録は,陸と大気の強い結合に関する以前のモデルを無効にしない.
- ヨア湖の記録は,西サハラの気候の動態をあまり表さない.
- 証拠は,いくつかの解釈における気候-植生フィードバックの潜在的な過度に単純化を示唆しています.
結論:
- サハラ砂漠におけるホロセンの半ばの気候・植生フィードバックは,ヨア湖の記録だけで示唆されるよりも強力かもしれない.
- 気候ダイナミクスの地域的な変動は,過去の気候変動を理解するために重要である.
- サハラ砂漠の気候フィードバックを完全に特徴付けるためには,さらなる研究が必要である.
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