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赤海北部のホロセンの初期の湿気期間の地中海水源である
Helge W Arz1, Frank Lamy, Jurgen Pätzold
1Deutsche Forschungsgemeinschaft (DFG) Research Center for Ocean Margins, University of Bremen, Klagenfurter Strasse, 28359 Bremen, Germany. helge.arz@uni-bremen.de
まとめ
初期のホロセンの赤海沈殿物核は,塩分が低く,河川の流れが増加した湿気期を明らかにし,降雨量が増えたことを示しています. これは,アフリカではなく地中海の雨が地域に影響を及ぼし,モンスーンがこの地域に到達しなかったことを示唆しています.
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
- 海洋地質学 海洋地質学
- ホロセンの気候ダイナミクス
背景:
- ホロセンの水文学的変化を理解することは,気候変動研究にとって極めて重要です.
- 赤海の最北の地域は,地中海の気候の影響の変化に敏感です.
- 過去の降雨パターンを再構築することは,気候モデルを検証するのに役立ちます.
研究 の 目的:
- 赤海北部の古塩度と原生堆積物を再構築する.
- ホロセーン期の地中海気候圏の南端の水文学的変化を推論する.
- ホロセンの初期に湿度が上昇した原因を特定する.
主な方法:
- 赤海最北部の2つの堆積物核の分析.
- 地化学プロキシを用いた古塩度再構築.
- 河川の活動を推論するために,地原の堆積物投入の定量化.
主要な成果:
- 約9.25万年前から7.25万年前にかけて,湿気期間の間隔が発生した.
- この間隔は,地表水の塩分が"000分の3程度減少した.
- 河川の沈殿物の増量により,降雨量と淡水流出量が大幅に増加し,その後現代の値まで減少した.
結論:
- 赤海北部の湿気間隔は,地中海からの降雨の強化と南方への延伸によるものです.
- 強化された初期のホロセンの北極振動パターンが,この現象に寄与している可能性があります.
- アフリカ・アジア・モンスーンの雨は,ホロセンの初期から中期にかけて,亜熱帯砂漠地帯を横断して北の赤海に到達しなかった.
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