During the past four decades significant decrease in Arctic sea ice and a dramatic ice mass loss of the Greenland Ice Sheet (GIS) has been coincident with global warming and an increase in atmospheric CO₂. In Northeast Greenland significant mass loss from the outlet glaciers Nioghalvfjerdsbræ (79NG) and Zachariæ Isstrøm (ZI) and intensive seasonal breakup of the local Norske Øer Ice Barrier (NØIB) have also been observed since 2000. In order to better understand the processes driving these modern changes, studies of paleoclimate records are important and of major societal relevance. A multiproxy study including organic‐biogeochemical and micropaleontological proxies was carried out on a marine sediment core recovered directly in front of 79NG. Data from Core PS100/270 evidenced a strong inflow of warm recirculating Atlantic Water across the Northeast Greenland shelf from the early Holocene between ~10 and 7.5 ka. An overall high in phytoplankton productivity occurred within a stable sea ice margin regime, accompanied by 79NG retreat most probably triggered by peak solar insolation and changes in the local ocean circulation. Enhanced basal melt of the underside of 79NG at ~7.5 ka then led to the total disintegration of the ice shelf. The released freshwater would have driven water column stratification and promoted the formation of the local landfast ice barrier, which is shown by lowered biomarker values and foraminifera abundances toward the end of the early Holocene. Near perennial sea ice conditions with short summers and 79NG retreat to the inner fjord then prevailed from ~7.5 to ~0.8 ka.

中文翻译：

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内东北格陵兰大陆架冰川退缩，海冰形成和大西洋对流之间的全新世相互作用

在过去的四十年中，北极海冰显着减少，格陵兰冰原（GIS）的冰块大量减少，这与全球变暖和大气中CO ₂的增加同时发生。。在2000年以来，还观察到东北格陵兰的出口冰川Nioghalvfjerdsbræ（79NG）和ZachariæIsstrøm（ZI）造成大量质量损失，并且局部NorskeØer冰障（NØIB）发生了剧烈的季节性破裂。为了更好地了解驱动这些过程的过程在现代变化中，对古气候记录的研究非常重要，并且与社会息息相关。对直接在79NG前方回收的海洋沉积岩心进行了包括有机-生物地球化学和微古生物学代理在内的多代理研究。核心PS100 / 270的数据表明，从全新世早期到10ka到7.5ka之间，温暖的再循环大西洋水大量流入东北格陵兰陆架。在稳定的海冰边缘范围内，浮游植物的生产力总体较高，伴随着79NG的退缩，很可能是由于日照高峰和当地海洋环流的变化而引发的。在约7.5 ka时79NG底部的基础融化增强，导致冰架完全崩塌。释放的淡水会促使水柱分层，并促进当地陆冰阻隔层的形成，这表现为在全新世末期生物标志物值降低和有孔虫丰度降低。夏季短，接近常年海冰条件，内峡湾退缩至79NG，然后从约7.5到〜0.8 ka盛行。释放的淡水会促使水柱分层，并促进当地陆冰阻隔层的形成，这表现为在全新世末期生物标志物值降低和有孔虫丰度降低。夏季短，接近常年海冰条件，内峡湾退缩至79NG，然后从约7.5到〜0.8 ka盛行。释放的淡水会促使水柱分层，并促进当地陆冰阻隔层的形成，这表现为在全新世末期生物标志物值降低和有孔虫丰度降低。夏季短，接近常年海冰条件，内峡湾退缩至79NG，然后从约7.5到〜0.8 ka盛行。