(Table 1) Age determination of sediment core MD99-2343

Down-core samples of planktonic and benthic foraminifera were analyzed for oxygen and carbon isotopes in International Marine Past Global Changes Study (IMAGES) core MD99-2343 in order to study the interactions between climate change in the Northern Hemisphere and the western Mediterranean thermohaline circulation at times of Heinrich events (HE). Our results confirm the antiphase correlation between enhanced North Atlantic Deep Water formation and low ventilation in the Mediterranean. However, this study reveals that this antiphase relationship in deepwater formation between the North Atlantic and Mediterranean was interrupted during times of HE when the injection of large volumes of water from melting icebergs reached the entrance to the Mediterranean. These events, which lasted less than 1000 years, are represented by pronounced decreases in both planktonic d18O and benthic d13C signals. Lower salinities of Mediterranean surface water resulted in a slowdown of western Mediterranean deepwater overturn even though cold sea surface temperatures and drier climate should have resulted in enhanced deepwater formation.本研究针对国际海洋过去全球变化研究（International Marine Past Global Changes Study，IMAGES）MD99-2343岩心，对其中的浮游有孔虫（planktonic foraminifera）与底栖有孔虫（benthic foraminifera）样品开展氧、碳同位素分析，旨在探究海因里希事件（Heinrich events，HE）时期北半球气候变化与西地中海温盐环流之间的相互作用机制。研究结果证实，北大西洋深层水形成增强与地中海通风效率降低之间存在显著的反相位关联。然而本研究揭示，当融释冰山注入的巨量水体抵达地中海入口时，北大西洋与地中海间深层水形成的这种反相位关系在海因里希事件期间被打断。这类持续时长不足1000年的事件，以浮游有孔虫δ¹⁸O与底栖有孔虫δ¹³C信号均出现显著降低为典型表征。尽管地中海表层海水盐度降低会导致西地中海深层水翻转环流减缓，但此时偏低的海表温度与更为干旱的气候本应促进深层水形成。