Baffin Bay is a semi-enclosed basin connecting the Arctic Ocean and the western North Atlantic, thus making out a significant pathway for heat exchange. Here we reconstruct the alternating advection of relatively warmer and saline Atlantic waters versus the incursion of colder Arctic water masses entering Baffin Bay through the multiple gateways in the Canadian Arctic Archipelago and the Nares Strait during the Holocene. We carried out benthic foraminiferal assemblage analyses, X-ray fluorescence scanning, and radiocarbon dating of a 738 cm long marine sediment core retrieved from eastern Baffin Bay near Upernavik, Greenland (Core AMD14-204C; 987 m water depth). Results reveal that eastern Baffin Bay was subjected to several oceanographic changes during the last 9.2 kyr. Waning deglacial conditions with enhanced meltwater influxes and an extensive sea-ice cover prevailed in eastern Baffin Bay from 9.2 to 7.9 ka. A transition towards bottom water amelioration is recorded at 7.9 ka by increased advection of Atlantic water masses, encompassing the Holocene Thermal Maximum. A cold period with growing sea-ice cover at 6.7 ka interrupts the overall warm subsurface water conditions, promoted by a weaker northward flow of Atlantic waters. The onset of the neoglaciation at ca. 2.9 ka is marked by an abrupt transition towards a benthic fauna dominated by agglutinated species, likely in part explained by a reduction of the influx of Atlantic Water, allowing an increased influx of the cold, corrosive Baffin Bay Deep Water originating from the Arctic Ocean to enter Baffin Bay through the Nares Strait. These cold subsurface water conditions persisted throughout the Late Holocene, only interrupted by short-lived warmings superimposed on this cooling trend.

中文翻译：

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巴芬湾东部全新世海洋条件的重建

巴芬湾是连接北冰洋和北大西洋西部的半封闭盆地，因此成为热交换的重要途径。在这里，我们重建了全新世期间相对较温暖和较咸的大西洋水的交替平流与相对较冷的北极水团通过加拿大北极群岛和纳雷斯海峡的多个入口进入巴芬湾的入侵。我们进行了底栖有孔虫的组装分析，X射线荧光扫描和738？的放射性碳测年。从格陵兰Upernavik附近的巴芬湾东部获取的1厘米长海洋沉积物核心（核心AMD14-204C；水深987米）。结果显示，东部巴芬湾在上一个9.2â€？期间发生了几次海洋变化。吉尔。在巴芬湾东部，从9.2到7.9盛行的冰川消退状况不断增强，融水涌入量增加，海冰覆盖范围广。KA。在7.9℃处记录了向底部水改善的过渡。ka通过增加大西洋水团的对流，包括全新世的热最大值。寒冷时期的海冰覆盖率不断提高，达到6.7℃ ka中断了整体温暖的地下水状况，这是由于大西洋水向北流减弱所致。大约在大约2月开始发生新冰期。2.9â？？K a其标志是突然向以凝集物种为主的底栖动物过渡，其部分原因可能是大西洋水的流入量减少，这使得来自北冰洋的寒冷腐蚀性巴芬湾深水的流入量增加，从而进入巴芬。穿过纳雷斯海峡湾。这些寒冷的地下水条件一直持续到全新世末期，只是由于短暂的变暖叠加在这种冷却趋势上而中断。