Colour reflectance and descriptions of seven sediment cores from the Weddell Sea@en

The timing of the last maximum extent of the Antarctic ice sheets relative to those in the Northern Hemisphere remains poorly understood. We develop a chronology for the Weddell Sea sector of the East Antarctic Ice Sheet that, combined with ages from other Antarctic ice-sheet sectors, indicates that the advance to and retreat from their maximum extent was within dating uncertainties synchronous with most sectors of Northern Hemisphere ice sheets. Surface climate forcing of Antarctic mass balance would probably cause an opposite response, whereby a warming climate would increase accumulation but not surface melting. Our new data support teleconnections involving sea-level forcing from Northern Hemisphere ice sheets and changes in North Atlantic deep-water formation and attendant heat flux to Antarctic grounding lines to synchronize the hemispheric ice sheets.南极冰盖末次最大扩张范围相对于北半球冰盖的时间节点，目前仍未得到充分认知。我们针对东南极冰盖（East Antarctic Ice Sheet）的威德尔海分区构建了年代序列，结合南极其他冰盖分区的测年数据后分析显示：冰盖扩张至最大范围并最终退缩的时间，在测年误差范围内与北半球多数冰盖分区的对应过程同步。南极物质平衡受地表气候强迫的响应或呈相反趋势：气候变暖会提升积雪积累量，但不会加剧地表消融。我们的新数据支持如下遥相关机制：北半球冰盖引发的海平面强迫、北大西洋深层水形成的变化，以及伴随的指向南极冰盖接地线的热通量，共同促成了南北半球冰盖的同步演化。