Rapid 20th-Century Increase in Coastal Upwelling off Northwest Africa
Rapid 20th-Century Increase in Coastal Upwelling off Northwest Africa
复制标题
DOI：
10.1126/science.1134839
复制
发表时间：
2007-02
期刊：
影响因子：
56.9
通讯作者：
H. McGregor;M. Dima;M. Dima;H. Fischer;S. Mulitza
中科院分区：
文献类型：
--
作者：
H. McGregor;M. Dima;M. Dima;H. Fischer;S. Mulitza
西北非洲边缘的近岸水域以沿海上升流为特征，是世界上主要的上升流区域之一。摩洛哥沉积物岩心的海表温度（SST）记录，追溯到2500年前，揭示了20世纪异常和前所未有的冷却，这与上升流的增加相一致。上升流驱动的海温也与北半球温度异常（NHTAs）的千年尺度变化不一致，在小冰期表现出相对温暖的条件，在中世纪温暖期表现出相对凉爽的条件。综上所述，这些结果表明沿海上升流随NHTAs的变化而变化，并且随着全球变暖和大气二氧化碳水平的增加，西北非洲的上升流可能会继续加强。
Near-shore waters along the northwest African margin are characterized by coastal upwelling and represent one of the world's major upwelling regions. Sea surface temperature (SST) records from Moroccan sediment cores, extending back 2500 years, reveal anomalous and unprecedented cooling during the 20th century, which is consistent with increased upwelling. Upwelling-driven SSTs also vary out of phase with millennial-scale changes in Northern Hemisphere temperature anomalies (NHTAs) and show relatively warm conditions during the Little Ice Age and relatively cool conditions during the Medieval Warm Period. Together, these results suggest that coastal upwelling varies with NHTAs and that upwelling off northwest Africa may continue to intensify as global warming and atmospheric CO2 levels increase.