作为平世-平世气候过渡的一部分,上游加剧
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
概括
在本格拉上游系统中的海面温度在过去450万年里显著降温. 这种降温与风力驱动的上升和海洋循环的变化相关.
科学领域:
- 古代海洋学 古代海洋学 古代海洋学
- 气候科学 气候科学
- 海洋地质学海洋地质学
背景情况:
- 班格拉上游系统是研究过去气候动态的一个关键区域.
- 了解海面温度 (SST) 的长期变化对于气候建模至关重要.
研究的目的:
- 在Benguela上游系统中重建SST的450万年时间序列.
- 为了研究冷却,上升和全球气候变化之间的关系.
主要方法:
- 对深海沉积物核心的分析.
- 海洋表面温度 (SST) 和古生产力的重建.
主要成果:
- 自320万年前以来,区域SST下降了大约10摄氏度.
- 有证据表明,与冷却相关的风力驱动的上游增加.
- 从普略世中期的温暖转移到四季纪晚期的冰川 - 冰川间周期.
结论:
- 班格拉地区经历了显著的降温和强化的上游.
- 大西洋的海洋表面循环在普略纪中期与四年纪晚期相比,在大西洋的海洋表面循环大大不同.
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