Age determination of sediments from Kilkeel and sediment core Y69-71P@en

Evidence from the Irish Sea basin supports the existence of an abrupt rise in sea level (meltwater pulse) at 19,000 years before the present (B.P.). Climate records indicate a large reduction in the strength of North Atlantic Deep Water formation and attendant cooling of the North Atlantic at this time, indicating a source of the meltwater pulse from one or more Northern Hemisphere ice sheets.Warming of the tropical Atlantic and Pacific oceans and the Southern Hemisphere also began at 19,000 years B.P. These responses identify mechanisms responsible for the propagation of deglacial climate signals to the Southern Hemisphere and tropics while maintaining a cold climate in the Northern Hemisphere.爱尔兰海盆地（Irish Sea basin）的研究证据表明，在距今19000年（B.P.）时曾发生海平面突发性上升事件——融水脉冲（meltwater pulse）。气候记录显示，该时期北大西洋深层水形成（North Atlantic Deep Water formation）的强度大幅减弱，且伴随北大西洋区域的降温现象，这指示此次融水脉冲的物质源区来自一处或多处北半球冰盖（Northern Hemisphere ice sheets）。热带大西洋、太平洋海域以及南半球的海洋同样在距今19000年B.P.启动增温过程。上述气候响应特征揭示了冰消期气候信号（deglacial climate signals）向南半球与热带区域传播的作用机制，同时也阐明了北半球在该时期仍维持寒冷气候状态的原因。