Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, PR China.
Laboratory for Marine Ecology and Environmental Science, Pilot Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, PR China.
Nat Commun. 2023 Jun 24;14(1):3788. doi: 10.1038/s41467-023-39490-6.
Changes in ocean ventilation have been pivotal in regulating carbon sequestration and release on centennial to millennial timescales. However, paleoceanographic reconstructions documenting changes in deep-ocean ventilation using C dating, may bear multidimensional explanations, obfuscating the roles of ocean ventilation played on climate evolution. Here, we show that previously inferred poorly ventilated conditions in the North Atlantic were linked to enhanced pre-aged organic carbon (OC) input during Heinrich Stadial 1 (HS1). The C age of sedimentary OC was approximately 13,345 ± 692 years older than the coeval foraminifera in the central North Atlantic during HS1, which is coupled to a ventilation age of 5,169 ± 660 years. Old OC was mainly of terrigenous origin and exported to the North Atlantic by ice-rafting. Remineralization of old terrigenous OC in the ocean may have contributed to, at least in part, the anomalously old ventilation ages reported for the high-latitude North Atlantic during HS1.
海洋通风的变化在调节碳的固存和释放方面起着至关重要的作用，其作用时间范围可达百年至千年。然而，使用放射性碳定年法记录深海通风变化的古海洋学重建，可能具有多维解释，从而混淆了海洋通风在气候演化中的作用。在这里，我们表明，先前推断的北大西洋通风不良的情况与 Heinrich 盛冰期 1 （HS1）期间增强的预老化有机碳（OC）输入有关。在 HS1 期间，沉积 OC 的 C 年龄比北大西洋中部同期的有孔虫大约老 13345 ± 692 年，这与通风年龄为 5169 ± 660 年有关。旧 OC 主要来源于陆地，通过冰漂流被输送到北大西洋。海洋中新陈代谢的旧陆源 OC 可能至少部分促成了 HS1 期间高纬度北大西洋报告的异常古老的通风年龄。
