Department of Marine and Coastal Environmental Science, Texas A&M University at Galveston, Galveston, TX, USA.
Department of Oceanography, Texas A&M University, College Station, TX, USA.
Sci Adv. 2023 Mar 15;9(11):eade1685. doi: 10.1126/sciadv.ade1685. Epub 2023 Mar 17.
Ventilation in the deep Gulf of Mexico (GoM), its connection to the North Atlantic, and its susceptibility to changes of the Atlantic Meridional Overturning Circulation are investigated by combining observations of radiocarbon and volume transport with a Coupled Model Intercomparison Project phase 6 (CMIP6) General Circulation Model (GCM) ensemble output. Radiocarbon data and multiannual volume transport through the Yucatan Channel suggest deep water residence times ~100 years for the GoM. Comparisons to previous radiocarbon observations suggest that the deep GoM has aged in the recent past, consistent with observed raising temperatures and the CMIP6 GCM simulations. The distribution of radiocarbon indicates a time frame of ~160 years between North Atlantic convection and complete ventilation of the deep GoM. This suggests that aging and warming of GoM deep waters were initiated in the North Atlantic before ~1890 consistent with reported rapid and persistent AMOC weakening since the Little Ice Age.
通过将放射性碳观测值和体积输送与耦合模式比较计划第六阶段（CMIP6）通用环流模型（GCM）集合输出相结合，研究了深墨西哥湾（GoM）的通风情况、与北大西洋的联系以及对大西洋子午翻转环流变化的敏感性。放射性碳数据和通过尤卡坦海峡的多年体积输送表明，GoM 的深水停留时间约为 100 年。与以前的放射性碳观测结果的比较表明，最近过去，深 GoM 的年龄在增加，这与观测到的升温以及 CMIP6 GCM 模拟结果一致。放射性碳的分布表明，北大西洋对流与深 GoM 的完全通风之间存在约 160 年的时间框架。这表明，GoM 深水的老化和变暖始于北大西洋，时间早于 1890 年，与小冰期以来报告的快速和持续的 AMOC 减弱一致。
